diff --git a/Buildings/Examples/Tutorial/SpaceCooling/System2.mo b/Buildings/Examples/Tutorial/SpaceCooling/System2.mo
index 918b4c9f7d8..391c7315a7b 100644
--- a/Buildings/Examples/Tutorial/SpaceCooling/System2.mo
+++ b/Buildings/Examples/Tutorial/SpaceCooling/System2.mo
@@ -79,8 +79,9 @@ model System2
dp2_nominal=200,
eps=eps) "Heat recovery"
annotation (Placement(transformation(extent={{-110,-36},{-90,-16}})));
- Buildings.Fluid.HeatExchangers.WetCoilCounterFlow cooCoi(redeclare package Medium1 =
- MediumW, redeclare package Medium2 = MediumA,
+ Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU cooCoi(
+ redeclare package Medium1 = MediumW,
+ redeclare package Medium2 = MediumA,
m1_flow_nominal=mW_flow_nominal,
m2_flow_nominal=mA_flow_nominal,
dp1_nominal=6000,
@@ -118,8 +119,8 @@ model System2
annotation (Placement(transformation(extent={{-160,40},{-140,60}})));
BoundaryConditions.WeatherData.Bus weaBus
annotation (Placement(transformation(extent={{-120,40},{-100,60}})));
- Buildings.Controls.OBC.CDL.Continuous.Sources.Constant mAir_flow(k=mA_flow_nominal)
- "Fan air flow rate"
+ Buildings.Controls.OBC.CDL.Continuous.Sources.Constant mAir_flow(k=
+ mA_flow_nominal) "Fan air flow rate"
annotation (Placement(transformation(extent={{0,0},{20,20}})));
Buildings.Controls.OBC.CDL.Continuous.Sources.Constant mWat_flow(k=mW_flow_nominal)
"Water flow rate"
@@ -188,11 +189,11 @@ equation
index=-1,
extent={{-6,3},{-6,3}}));
connect(fan.m_flow_in, mAir_flow.y) annotation (Line(
- points={{49.8,-8},{49.8,10},{21,10}},
+ points={{50,-8},{50,10},{22,10}},
color={0,0,127},
smooth=Smooth.None));
connect(mWat_flow.y, souWat.m_flow_in) annotation (Line(
- points={{-59,-104},{-52,-104},{-52,-92},{-40,-92}},
+ points={{-58,-104},{-52,-104},{-52,-92},{-42,-92}},
color={0,0,127},
smooth=Smooth.None));
connect(hex.port_b1, senTemHXOut.port_a) annotation (Line(
@@ -419,8 +420,14 @@ We assign this value using the equation
where Q̇ is the exchanged heat and
lmtd is the logarithmic mean temperature difference.
-The computation of the UA is done using the
-parameter assignment
+The computation of the UA is done
+by setting
+
+
+use_UA_nominal=true
+
+
+and then using the parameter assignment
UA_nominal=-QCoiC_flow_nominal/
@@ -440,9 +447,7 @@ In order to see the coil inlet and outlet temperatures, we set the parameter
show_T = true
-Its default value is false, as this setting can lead to faster computation
-in large system models in which the flow rate crosses zero, because crossing zero
-triggers the numerical solution for a state-event which can be computationally expensive.
+Its default value is false.
To use prescribed initial values for the state variables of the cooling coil, we set
diff --git a/Buildings/Examples/Tutorial/SpaceCooling/System3.mo b/Buildings/Examples/Tutorial/SpaceCooling/System3.mo
index 00656c4d8aa..11e7c64a0fd 100644
--- a/Buildings/Examples/Tutorial/SpaceCooling/System3.mo
+++ b/Buildings/Examples/Tutorial/SpaceCooling/System3.mo
@@ -60,8 +60,7 @@ model System3
QCoiC_flow_nominal/(TWRet_nominal-TWSup_nominal)/4200
"Nominal water mass flow rate";
- Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature
- TOut
+ Modelica.Thermal.HeatTransfer.Sources.PrescribedTemperature TOut
"Outside temperature"
annotation (Placement(transformation(extent={{-20,40},{0,60}})));
Modelica.Thermal.HeatTransfer.Sources.FixedHeatFlow preHea(Q_flow=
@@ -80,21 +79,22 @@ model System3
dp2_nominal=200,
eps=eps) "Heat recovery"
annotation (Placement(transformation(extent={{-110,-36},{-90,-16}})));
- Buildings.Fluid.HeatExchangers.WetCoilCounterFlow cooCoi(redeclare package Medium1 =
- MediumW, redeclare package Medium2 = MediumA,
+ Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU cooCoi(
+ redeclare package Medium1 = MediumW,
+ redeclare package Medium2 = MediumA,
m1_flow_nominal=mW_flow_nominal,
m2_flow_nominal=mA_flow_nominal,
dp1_nominal=6000,
+ dp2_nominal=200,
UA_nominal=-QCoiC_flow_nominal/
Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
T_a1=THeaRecLvg,
T_b1=TASup_nominal,
T_a2=TWSup_nominal,
T_b2=TWRet_nominal),
- dp2_nominal=200,
show_T=true,
energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial) "Cooling coil"
- annotation (Placement(
+ annotation (Placement(
transformation(
extent={{-10,-10},{10,10}},
rotation=180,
@@ -198,7 +198,7 @@ equation
index=-1,
extent={{-6,3},{-6,3}}));
connect(fan.m_flow_in, mAir_flow.y) annotation (Line(
- points={{49.8,-8},{49.8,10},{21,10}},
+ points={{50,-8},{50,10},{22,10}},
color={0,0,127},
smooth=Smooth.None));
connect(hex.port_b1, senTemHXOut.port_a) annotation (Line(
@@ -222,7 +222,7 @@ equation
color={191,0,0},
smooth=Smooth.None));
connect(TRooSetPoi.y, con.reference) annotation (Line(
- points={{-149,-80},{-136,-80},{-136,-94},{-122,-94}},
+ points={{-148,-80},{-136,-80},{-136,-94},{-122,-94}},
color={0,0,127},
smooth=Smooth.None));
connect(vol.heatPort, senTemRoo.port) annotation (Line(
@@ -234,11 +234,11 @@ equation
color={0,0,127},
smooth=Smooth.None));
connect(con.y, mWat_flow.u) annotation (Line(
- points={{-99,-100},{-82,-100}},
+ points={{-98,-100},{-82,-100}},
color={255,0,255},
smooth=Smooth.None));
connect(mWat_flow.y, souWat.m_flow_in) annotation (Line(
- points={{-59,-100},{-50,-100},{-50,-92},{-40,-92}},
+ points={{-58,-100},{-50,-100},{-50,-92},{-42,-92}},
color={0,0,127},
smooth=Smooth.None));
annotation (Documentation(info="
diff --git a/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilDryRegime.mo b/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilDryRegime.mo
new file mode 100644
index 00000000000..bedffb2e009
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilDryRegime.mo
@@ -0,0 +1,104 @@
+within Buildings.Fluid.HeatExchangers.BaseClasses;
+model WetCoilDryRegime
+ "Fully dry coil model"
+
+ // - water
+ input Modelica.SIunits.ThermalConductance UAWat
+ "UA for water side";
+ input Modelica.SIunits.MassFlowRate mWat_flow
+ "Mass flow rate for water";
+ input Modelica.SIunits.MassFlowRate mWatNonZer_flow(min=Modelica.Constants.eps)
+ "Mass flow rate for water, bounded away from zero";
+
+ input Modelica.SIunits.SpecificHeatCapacity cpWat
+ "Specific heat capacity of water";
+ input Modelica.SIunits.Temperature TWatIn
+ "Water temperature at inlet";
+ // -- air
+ input Modelica.SIunits.ThermalConductance UAAir
+ "UA for air side";
+ input Modelica.SIunits.MassFlowRate mAir_flow(min=Modelica.Constants.eps)
+ "Mass flow rate of air";
+ input Modelica.SIunits.MassFlowRate mAirNonZer_flow(min=Modelica.Constants.eps)
+ "Mass flow rate for air, bounded away from zero";
+ input Modelica.SIunits.SpecificHeatCapacity cpAir
+ "Specific heat capacity of moist air at constant pressure";
+ input Modelica.SIunits.Temperature TAirIn
+ "Temperature of air at inlet";
+ // -- misc.
+ input Buildings.Fluid.Types.HeatExchangerFlowRegime cfg
+ "The flow regime of the heat exchanger";
+ input Modelica.SIunits.MassFlowRate mAir_flow_nominal
+ "Nominal mass flow rate for air";
+ input Modelica.SIunits.MassFlowRate mWat_flow_nominal
+ "Nominal mass flow rate for water";
+
+ parameter Real delta = 1E-3 "Small value used for smoothing";
+
+ output Modelica.SIunits.HeatFlowRate QTot_flow
+ "Heat transferred from water to air";
+ output Modelica.SIunits.Temperature TWatOut
+ "Temperature of water at outlet";
+ output Modelica.SIunits.Temperature TAirOut
+ "Temperature of air at the outlet";
+ output Real eps(min=0, max=1, unit="1")
+ "Effectiveness for heat exchanger";
+ Modelica.SIunits.ThermalConductance CWat_flow=mWat_flow*cpWat
+ "Capacitance rate of water";
+ Modelica.SIunits.ThermalConductance CAir_flow=mAir_flow*cpAir
+ "Capacitance rate of air";
+ Modelica.SIunits.ThermalConductance CMin_flow_nominal=
+ min(mAir_flow_nominal*cpAir,mWat_flow_nominal*cpWat)
+ "Minimum capacity rate";
+ Modelica.SIunits.ThermalConductance CMax_flow_nominal=
+ max(mAir_flow_nominal*cpAir,mWat_flow_nominal*cpWat)
+ "Maximum capacity rate";
+ Modelica.SIunits.ThermalConductance CMin_flow=
+ Buildings.Utilities.Math.Functions.smoothMin(
+ x1=CAir_flow,x2=CWat_flow,deltaX=1E-3*(CMax_flow_nominal-CMin_flow_nominal))
+ "Minimum capacity rate";
+ Modelica.SIunits.ThermalConductance UA
+ "Overall heat transfer coefficient";
+ output Modelica.SIunits.Temperature TSurAirOut
+ "Surface Temperature at air outlet";
+equation
+ UA = 1/ (1 / UAAir + 1 / UAWat);
+
+ eps=epsilon_C(
+ UA=UA,
+ C1_flow=CWat_flow,
+ C2_flow=CAir_flow,
+ flowRegime=Integer(cfg),
+ CMin_flow_nominal= CMin_flow_nominal,
+ CMax_flow_nominal=CMax_flow_nominal,
+ delta= delta);
+
+ QTot_flow = eps*CMin_flow*(TAirIn-TWatIn);
+ TAirOut=TAirIn-QTot_flow/(mAirNonZer_flow*cpAir);
+ TWatOut=TWatIn+QTot_flow/(mWatNonZer_flow*cpWat);
+
+ (TAirOut-TSurAirOut)*UAAir=(TSurAirOut-TWatIn)*UAWat;
+
+ annotation (Icon(coordinateSystem(preserveAspectRatio=false), graphics={
+ Rectangle(
+ extent={{-100,100},{100,-100}},
+ lineColor={28,108,200},
+ fillColor={255,213,170},
+ fillPattern=FillPattern.Solid)}), Diagram(
+ coordinateSystem(preserveAspectRatio=false)),
+ Documentation(revisions="
+
+- Jan 21, 2021, by Donghun Kim:
First implementation of the fuzzy model.
+See issue 622
+for more information.
+
+", info="
+This model implements the calculation for a 100% dry coil.
+
+See
+
+Buildings.Fluid.HeatExchangers.DryCoilEffectivenessNTU
+for documentation.
+
+"));
+end WetCoilDryRegime;
diff --git a/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilDryWetRegime.mo b/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilDryWetRegime.mo
new file mode 100644
index 00000000000..b47dc6444d9
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilDryWetRegime.mo
@@ -0,0 +1,422 @@
+within Buildings.Fluid.HeatExchangers.BaseClasses;
+model WetCoilDryWetRegime
+ "Model implementing the switching algorithm of the TK-fuzzy model for cooling coil application"
+
+ parameter Modelica.SIunits.MassFlowRate mWat_flow_nominal(min=0)
+ "Nominal mass flow rate for water"
+ annotation(Dialog(group = "Nominal condition"));
+ parameter Modelica.SIunits.MassFlowRate mAir_flow_nominal(min=0)
+ "Nominal mass flow rate for air"
+ annotation(Dialog(group = "Nominal condition"));
+
+ input Real Qfac(final unit="1")
+ "a smoothing factor to prevent division-by-zero";
+
+ input Buildings.Fluid.Types.HeatExchangerFlowRegime cfg=
+ Buildings.Fluid.Types.HeatExchangerFlowRegime.CounterFlow
+ "heat exchanger configuration";
+
+ // -- Water
+ Modelica.Blocks.Interfaces.RealInput UAWat(
+ final quantity="ThermalConductance",
+ final unit="W/K")
+ "Product of heat transfer coefficient times area for water side"
+ annotation (Placement(transformation(extent={{-160,100},{-140,120}}),
+ iconTransformation(extent={{-160,100},{-140,120}})));
+ Modelica.Blocks.Interfaces.RealInput mWat_flow(
+ quantity="MassFlowRate",
+ min = 0,
+ final unit="kg/s")
+ "Mass flow rate for water"
+ annotation (Placement(transformation(extent={{-160,80},{-140,100}}),
+ iconTransformation(extent={{-160,80},{-140,100}})));
+ Modelica.Blocks.Interfaces.RealInput cpWat(
+ final quantity="SpecificHeatCapacity",
+ final unit="J/(kg.K)")
+ "Inlet water temperature"
+ annotation (Placement(transformation(extent={{-160,60},{-140,80}}),
+ iconTransformation(extent={{-160,60},{-140,80}})));
+ Modelica.Blocks.Interfaces.RealInput TWatIn(
+ final quantity="ThermodynamicTemperature",
+ final unit="K",
+ min = 200,
+ start = 288.15,
+ nominal = 300,
+ displayUnit="degC")
+ "Inlet water temperature"
+ annotation (Placement(transformation(extent={{-160,40},{-140,60}}),
+ iconTransformation(extent={{-160,40},{-140,60}})));
+ // -- Air
+ Modelica.Blocks.Interfaces.RealInput UAAir(
+ final quantity="ThermalConductance",
+ final unit="W/K")
+ "Product of heat transfer coefficient times area for air side"
+ annotation (Placement(transformation(extent={{-160,-120},{-140,-100}}),
+ iconTransformation(extent={{-160,-120},{-140,-100}})));
+ Modelica.Blocks.Interfaces.RealInput mAir_flow(
+ quantity="MassFlowRate",
+ min = 0,
+ final unit="kg/s")
+ "Mass flow rate for air"
+ annotation (Placement(transformation(extent={{-160,-100},{-140,-80}}),
+ iconTransformation(extent={{-160,-100},{-140,-80}})));
+ Modelica.Blocks.Interfaces.RealInput cpAir(
+ final quantity="SpecificHeatCapacity",
+ final unit="J/(kg.K)")
+ "Inlet specific heat capacity (at constant pressure)"
+ annotation (Placement(
+ transformation(extent={{-160,-80},{-140,-60}}), iconTransformation(
+ extent={{-160,-80},{-140,-60}})));
+ Modelica.Blocks.Interfaces.RealInput TAirIn(
+ final quantity="ThermodynamicTemperature",
+ final unit="K",
+ min = 200,
+ start = 288.15,
+ nominal = 300,
+ displayUnit="degC")
+ "Inlet air temperature"
+ annotation (Placement(transformation(extent={{-160,-60},{-140,-40}}),
+ iconTransformation(extent={{-160,-60},{-140,-40}})));
+ Modelica.Blocks.Interfaces.RealInput hAirIn(
+ final quantity="SpecificEnergy",
+ final unit="J/kg")
+ "Inlet air enthalpy"
+ annotation (
+ Placement(transformation(extent={{-160,-40},{-140,-20}}),
+ iconTransformation(extent={{-160,-40},{-140,-20}})));
+ Modelica.Blocks.Interfaces.RealInput pAir(
+ final quantity="Pressure",
+ final unit="Pa",
+ displayUnit="bar",
+ min=70000,
+ nominal = 1e5)
+ "Inlet air absolute pressure"
+ annotation (Placement(transformation(extent={{-160,-20},{-140,0}}),
+ iconTransformation(extent={{-160,-20},{-140,0}})));
+ Modelica.Blocks.Interfaces.RealInput X_wAirIn(
+ min=0,
+ max=1,
+ unit="1")
+ "Mass fraction of water in inlet air (kg water/kg total air)"
+ annotation (
+ Placement(transformation(extent={{-160,0},{-140,20}}), iconTransformation(
+ extent={{-160,0},{-140,20}})));
+
+ Modelica.Blocks.Interfaces.RealOutput QTot_flow(
+ final quantity="Power",
+ final unit="W")
+ "Total heat transfer from water into air, negative for cooling"
+ annotation (
+ Placement(transformation(extent={{-10,-10},{10,10}},
+ rotation=0,
+ origin={150,-20})));
+ Modelica.Blocks.Interfaces.RealOutput QSen_flow(
+ final quantity="Power",
+ final unit="W")
+ "Sensible heat transfer from water into air, negative for cooling"
+ annotation (
+ Placement(transformation(extent={{-10,-10},{10,10}},
+ rotation=0,
+ origin={150,-60})));
+ Modelica.SIunits.HeatFlowRate QLat_flow "Latent heat transfer rate";
+
+ Modelica.Blocks.Interfaces.RealOutput mCon_flow(
+ quantity="MassFlowRate",
+ final unit="kg/s")
+ "Mass flow of the condensate, negative for dehumidification"
+ annotation (
+ Placement(transformation(extent={{-10,-10},{10,10}},
+ rotation=0,
+ origin={150,-100})));
+ Buildings.Fluid.HeatExchangers.BaseClasses.WetCoilDryRegime fullyDry(
+ final UAWat=UAWat,
+ final mWat_flow=mWat_flow,
+ final cpWat=cpWat,
+ final TWatIn=TWatIn,
+ final UAAir=UAAir,
+ final mAir_flow=mAir_flow,
+ final mWatNonZer_flow=mWatNonZer_flow,
+ final mAirNonZer_flow=mAirNonZer_flow,
+ final cpAir=cpAir,
+ final TAirIn=TAirIn,
+ final cfg=cfg,
+ final mAir_flow_nominal=mAir_flow_nominal,
+ final mWat_flow_nominal=mWat_flow_nominal) "Fully-dry coil model";
+
+ Buildings.Fluid.HeatExchangers.BaseClasses.WetCoilWetRegime fullyWet(
+ final UAWat=UAWat,
+ final mWat_flow=mWat_flow,
+ final cpWat=cpWat,
+ final TWatIn=TWatIn,
+ final UAAir=UAAir,
+ final mAir_flow=mAir_flow,
+ final mWatNonZer_flow=mWatNonZer_flow,
+ final mAirNonZer_flow=mAirNonZer_flow,
+ final cpAir=cpAir,
+ final TAirIn=TAirIn,
+ final cfg=cfg,
+ final mAir_flow_nominal=mAir_flow_nominal,
+ final mWat_flow_nominal=mWat_flow_nominal,
+ final pAir=pAir,
+ final X_wAirIn=X_wAirIn) "Fully-wet coil model";
+
+ Real dryFra(final unit="1", min=0, max=1)
+ "Dry fraction, 0.3 means condensation occurs at 30% heat exchange length from air inlet";
+protected
+ Modelica.SIunits.MassFlowRate mAirNonZer_flow(min=Modelica.Constants.eps)=
+ Buildings.Utilities.Math.Functions.smoothMax(
+ x1=mAir_flow,
+ x2=1E-3 *mAir_flow_nominal,
+ deltaX=0.25E-3*mAir_flow_nominal)
+ "Mass flow rate of air";
+ Modelica.SIunits.MassFlowRate mWatNonZer_flow(min=Modelica.Constants.eps)=
+ Buildings.Utilities.Math.Functions.smoothMax(
+ x1=mWat_flow,
+ x2=1E-3 *mWat_flow_nominal,
+ deltaX=0.25E-3*mWat_flow_nominal)
+ "Mass flow rate of water";
+
+ Modelica.SIunits.Temperature TAirInDewPoi
+ "Dew point temperature of incoming air";
+
+ Buildings.Utilities.Psychrometrics.pW_X pWIn(
+ final X_w=X_wAirIn,
+ final p_in=pAir);
+ Buildings.Utilities.Psychrometrics.TDewPoi_pW TDewIn(
+ final p_w=pWIn.p_w);
+
+ //-- Values for fuzzy logics
+ Real mu_FW(final unit="1", min=0, max=1), mu_FD(unit="1",min=0, max=1)
+ "Membership functions for Fully-Wet and Fully-Dry conditions";
+ Real w_FW(final unit="1", min=0, max=1), w_FD(unit="1",min=0, max=1)
+ "Normalized weight functions for Fully-Wet and Fully-Dry conditions";
+
+equation
+
+ TAirInDewPoi=TDewIn.T;
+
+ mu_FW= Buildings.Utilities.Math.Functions.spliceFunction(
+ pos=0,neg=1,x=fullyWet.TSurAirIn-TAirInDewPoi,
+ deltax=Buildings.Utilities.Math.Functions.smoothMax(abs(fullyDry.TSurAirOut-fullyWet.TSurAirIn), 1e-2,1e-3));
+ //max(abs(fullyDry.TSurAirOut- fullyWet.TSurAirIn),1e-3));
+
+ mu_FD= Buildings.Utilities.Math.Functions.spliceFunction(
+ pos=1,neg=0,x=fullyDry.TSurAirOut-TAirInDewPoi,
+ deltax=Buildings.Utilities.Math.Functions.smoothMax(abs(fullyDry.TSurAirOut-fullyWet.TSurAirIn), 1e-2,1e-3));
+ //max(abs(fullyDry.TSurAirOut- fullyWet.TSurAirIn),1e-3));
+
+ w_FW=mu_FW/(mu_FW+mu_FD);
+ w_FD=mu_FD/(mu_FW+mu_FD);
+
+ QTot_flow= -(w_FW*fullyWet.QTot_flow+w_FD*fullyDry.QTot_flow)*Qfac;
+ QSen_flow= -(w_FW*fullyWet.QSen_flow+w_FD*fullyDry.QTot_flow)*Qfac;
+ dryFra= w_FD;
+
+ QLat_flow=QTot_flow-QSen_flow;
+ mCon_flow=QLat_flow/Buildings.Utilities.Psychrometrics.Constants.h_fg*Qfac;
+ annotation (Icon(coordinateSystem(preserveAspectRatio=false, extent={{-140,-120},
+ {140,120}}), graphics={
+ Rectangle(
+ extent={{-140,120},{140,-120}},
+ lineColor={0,0,0},
+ lineThickness=0.5,
+ pattern=LinePattern.Dot,
+ fillColor={236,236,236},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{20,40},{100,-40}},
+ lineColor={28,108,200},
+ fillColor={170,227,255},
+ fillPattern=FillPattern.Forward),
+ Text(
+ extent={{24,36},{96,2}},
+ textStyle={TextStyle.Bold},
+ pattern=LinePattern.None,
+ textString="WET",
+ lineColor={0,0,0}),
+ Line(
+ points={{20,0},{120,0}},
+ color={28,108,200},
+ thickness=1,
+ pattern=LinePattern.Dash),
+ Ellipse(
+ extent={{72,0},{66,-6}},
+ lineColor={28,108,200},
+ fillColor={170,255,255},
+ fillPattern=FillPattern.Solid),
+ Ellipse(
+ extent={{82,-4},{76,-10}},
+ lineColor={28,108,200},
+ fillColor={170,255,255},
+ fillPattern=FillPattern.Solid),
+ Ellipse(
+ extent={{96,0},{88,-8}},
+ lineColor={28,108,200},
+ fillColor={170,255,255},
+ fillPattern=FillPattern.Solid),
+ Ellipse(
+ extent={{64,-4},{58,-10}},
+ lineColor={28,108,200},
+ fillColor={170,255,255},
+ fillPattern=FillPattern.Solid),
+ Ellipse(
+ extent={{54,0},{48,-6}},
+ lineColor={28,108,200},
+ fillColor={170,255,255},
+ fillPattern=FillPattern.Solid),
+ Ellipse(
+ extent={{42,-4},{36,-10}},
+ lineColor={28,108,200},
+ fillColor={170,255,255},
+ fillPattern=FillPattern.Solid),
+ Ellipse(
+ extent={{32,0},{24,-8}},
+ lineColor={28,108,200},
+ fillColor={170,255,255},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{-60,40},{20,-40}},
+ lineColor={28,108,200},
+ fillColor={255,213,170},
+ fillPattern=FillPattern.Forward),
+ Text(
+ extent={{-16,-4},{56,-38}},
+ textStyle={TextStyle.Bold},
+ textString="CALCS",
+ pattern=LinePattern.None),
+ Line(
+ points={{-80,0},{20,0}},
+ color={28,108,200},
+ thickness=1,
+ pattern=LinePattern.Dash),
+ Text(
+ extent={{-56,36},{16,2}},
+ textStyle={TextStyle.Bold},
+ textString="DRY",
+ pattern=LinePattern.None),
+ Text(
+ extent={{-22,60},{58,40}},
+ lineColor={28,108,200},
+ fillColor={170,170,255},
+ fillPattern=FillPattern.Forward,
+ textString="Water",
+ textStyle={TextStyle.Italic}),
+ Text(
+ extent={{-20,-40},{60,-60}},
+ lineColor={28,108,200},
+ fillColor={170,170,255},
+ fillPattern=FillPattern.Forward,
+ textString="Air",
+ textStyle={TextStyle.Italic}),
+ Text(
+ extent={{-116,-104},{-116,-116}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="hA"),
+ Text(
+ extent={{-116,116},{-116,104}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="hA"),
+ Text(
+ extent={{-116,96},{-116,84}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="masFlo"),
+ Text(
+ extent={{-116,76},{-116,64}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="cp"),
+ Text(
+ extent={{-116,56},{-116,44}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="T_in"),
+ Text(
+ extent={{-116,-84},{-116,-96}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="masFlo"),
+ Text(
+ extent={{-116,-64},{-116,-76}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="cp"),
+ Text(
+ extent={{-116,-44},{-116,-56}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="T_in"),
+ Text(
+ extent={{-116,-24},{-116,-36}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="h_in"),
+ Text(
+ extent={{-116,-4},{-116,-16}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="p_in"),
+ Text(
+ extent={{-116,16},{-116,4}},
+ lineColor={28,108,200},
+ horizontalAlignment=TextAlignment.Left,
+ textString="w_in"),
+ Text(
+ extent={{120,-12},{120,-24}},
+ lineColor={28,108,200},
+ textString="QTot_flow"),
+ Text(
+ extent={{104,-94},{104,-106}},
+ lineColor={28,108,200},
+ textString="mCon_flow"),
+ Text(
+ extent={{118,-52},{118,-64}},
+ lineColor={28,108,200},
+ textString="QSen")}), Diagram(
+ coordinateSystem(preserveAspectRatio=false, extent={{-140,-120},{140,120}})),
+ Documentation(revisions="
+
+- Jan 21, 2021, by Donghun Kim:
First implementation of the fuzzy model.
+See issue 622 for more information.
+
+
+", info="
+
+This model implements the switching algorithm for the dry and wet regime.
+
+
+The switching criteria for (counter-flow) cooling coil modes are as follows.
+
+R1: If the coil surface temperature at the air inlet is lower than the dew-point
+temperature at the inlet to the coil, then the cooling coil surface is fully-wet.
+
+R2: If the surface temperature at the air outlet section is higher than
+the dew-point temperature of the air at the inlet, then the cooling coil surface is fully-dry.
+
+At each point of a simulation time step, the fuzzy-modeling approach determines
+the weights for R1 and R2 respectively (namely μFW and μFD)
+from the dew-point and coil surface temperatures.
+
+It calculates total and sensible heat transfer rates according to the weights as follows.
+
+
+Q̇tot=μFD Q̇tot,FD+μFW Qtot,FW
+
+
+Q̇sen=μFD Q̇sen,FD+μFW Qsen,FW
+
+
+The fuzzy-modeling ensures μFW + μFD = 1,
+μFW >=0 and μFD >=0, which means the fuzzy
+model outcomes of Q̇sen and Q̇tot are always convex combinations of heat transfer
+rates for fully-dry and fully-wet modes and therefore are always bounded by them.
+
+
+The modeling approach also results in n-th order differentiable model
+depending on the selection of the underlying membership functions. This cooling
+coil model is once continuously differentiable at the mode switches.
+
+"));
+end WetCoilDryWetRegime;
diff --git a/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilUARated.mo b/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilUARated.mo
new file mode 100644
index 00000000000..39b9b57ace2
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilUARated.mo
@@ -0,0 +1,194 @@
+within Buildings.Fluid.HeatExchangers.BaseClasses;
+model WetCoilUARated
+ "Model that calculates the UA-value from cooling coil data at rated conditions."
+
+ replaceable package MediumA=Buildings.Media.Air
+ constrainedby Modelica.Media.Interfaces.PartialMedium
+ "Air-side medium";
+ replaceable package MediumW=Buildings.Media.Water
+ constrainedby Modelica.Media.Interfaces.PartialMedium
+ "Water-side medium";
+
+ parameter Boolean use_Q_flow_nominal = false
+ "Set to true to specify Q_flow_nominal and inlet conditions, or to false to specify UA_nominal"
+ annotation (
+ Evaluate=true,
+ Dialog(group="Nominal thermal performance"));
+ parameter Modelica.SIunits.HeatFlowRate QTot_flow
+ "Nominal heat flow rate (positive for heat transfer from 1 to 2)";
+ parameter Modelica.SIunits.Temperature TAirIn
+ "Air inlet temperature at a rated condition";
+
+ parameter Modelica.SIunits.MassFraction X_wAirIn
+ "Mass fraction of water in inlet air at a rated condition";
+ parameter Modelica.SIunits.Temperature TWatIn
+ "Water inlet temperature at a rated condition";
+
+ parameter Modelica.SIunits.MassFlowRate mAir_flow
+ "Air mass flow rate at a rated condition";
+ parameter Modelica.SIunits.MassFlowRate mWat_flow
+ "Water mass flow rate at a rated condition";
+ parameter Modelica.SIunits.ThermalConductance UA
+ "the overall heat transfer coefficient for a fully dry condition";
+ parameter Real r_nominal(min=0, max=1)
+ "Ratio between air-side and water-side convective heat transfer at nominal condition";
+
+protected
+ constant Modelica.SIunits.SpecificEnthalpy hfg=
+ Buildings.Utilities.Psychrometrics.Constants.h_fg
+ "Enthapy of vaporization of water";
+ constant Modelica.SIunits.SpecificEnthalpy hUnit=1
+ "Physical dimension of specific enthalpy used for a unit conversion";
+ constant Modelica.SIunits.Temperature TUnit=1
+ "Physical dimension of temperature used for a unit conversion";
+ constant Modelica.SIunits.SpecificHeatCapacity cpUnit=1
+ "Physical dimension of specific heat capacity used for a unit conversion";
+ parameter Modelica.SIunits.Temperature TAirOut(fixed=false)
+ "Air outlet temperature at a rated condition";
+ parameter Modelica.SIunits.Temperature TWatOut=
+ TWatIn - QTot_flow / cpWat / mWat_flow
+ "Water outlet temperature at a rated condition";
+ parameter Modelica.SIunits.SpecificEnthalpy hAirIn = MediumA.specificEnthalpy_pTX(
+ p=MediumA.p_default, T=TAirIn, X={X_wAirIn, 1-X_wAirIn})
+ "Enthalpy of incoming moist air at a rated condition";
+ parameter MediumA.ThermodynamicState staAir=MediumA.setState_phX(
+ p=MediumA.p_default, h=hAirIn, X={X_wAirIn, 1-X_wAirIn})
+ "Inlet air thermodynamic state";
+ parameter Modelica.SIunits.SpecificHeatCapacity cpAir=
+ MediumA.specificHeatCapacityCp(staAir)
+ "Isobaric specific heat capacity of air";
+ parameter Modelica.SIunits.SpecificEnthalpy hAirOut=
+ hAirIn + QTot_flow / mAir_flow
+ "Enthalpy of outgoing moist air at a rated condition";
+ parameter Modelica.SIunits.SpecificEnthalpy hWatIn = MediumW.specificEnthalpy_pTX(
+ p=MediumW.p_default, T=TWatIn, X=MediumW.X_default)
+ "Enthalpy of incoming moist air at a rated condition";
+ parameter MediumW.ThermodynamicState staWat=MediumW.setState_phX(
+ p=MediumW.p_default, h=hWatIn, X=MediumW.X_default)
+ "Inlet water thermodynamic state";
+ parameter Modelica.SIunits.SpecificHeatCapacity cpWat=
+ MediumW.specificHeatCapacityCp(staWat)
+ "Isobaric specific heat capacity of water";
+ parameter Modelica.SIunits.SpecificHeatCapacity cpEff(fixed=false, min= 0)
+ "Effective specific heat: change in saturated moist air enthalpy with respect to
+ temperature along the saturation line between inlet and outlet water temperatures";
+ parameter Modelica.SIunits.SpecificEnthalpy LMED(fixed=false)
+ "Log mean enthalpy difference";
+ parameter Modelica.SIunits.MassFlowRate UASta(fixed=false, min=0, start=1/(1/10+1/20))
+ "Overall heat transfer coefficient for enthalpy difference";
+ parameter Modelica.SIunits.ThermalConductance UAAir(min=0,start=10,fixed=false)
+ "Air side convective heat transfer coefficient, including fin resistance";
+ parameter Modelica.SIunits.ThermalConductance UAWat(min=0,start=20,fixed=false)
+ "Water side convective heat transfer coefficient";
+ parameter Boolean isFulDry(fixed=false)
+ "Indicator of the fully-dry coil regime";
+ parameter Boolean isFulWet(fixed=false)
+ "Indicator of the fully-wet coil regime";
+ parameter Modelica.SIunits.AbsolutePressure pSatTWatIn=
+ Buildings.Utilities.Psychrometrics.Functions.saturationPressure(TWatIn)
+ "Saturation pressure of water at the water inlet temperature";
+ parameter Modelica.SIunits.MassFraction X_wSatTWatIn=
+ Buildings.Utilities.Psychrometrics.Functions.X_pSatpphi(
+ pSat=pSatTWatIn, p=MediumA.p_default, phi=1)
+ "Mass fraction of water in saturated moist air at the water inlet temperature";
+ parameter Modelica.SIunits.SpecificEnthalpy hSatTWatIn=
+ Buildings.Media.Air.specificEnthalpy_pTX(
+ p=MediumA.p_default, T=TWatIn, X={X_wSatTWatIn,1-X_wSatTWatIn})
+ "Enthalpy of saturated moist air at the water inlet temperature";
+ parameter Modelica.SIunits.AbsolutePressure pSatTWatOut=
+ Buildings.Utilities.Psychrometrics.Functions.saturationPressure(TWatOut)
+ "Saturation pressure of water at the water oulet temperature";
+ parameter Modelica.SIunits.MassFraction X_wSatTWatOut=
+ Buildings.Utilities.Psychrometrics.Functions.X_pSatpphi(
+ pSat=pSatTWatOut, p=MediumA.p_default, phi=1)
+ "Mass fraction of water in saturated moist air at the water outlet temperature";
+ parameter Modelica.SIunits.SpecificEnthalpy hSatTWatOut=
+ Buildings.Media.Air.specificEnthalpy_pTX(
+ p=MediumA.p_default, T=TWatOut, X={X_wSatTWatOut,1-X_wSatTWatOut})
+ "Enthalpy of saturated moist air at the water oulet temperature";
+initial equation
+ isFulDry = if use_Q_flow_nominal then (X_wSatTWatIn >= X_wAirIn) else true;
+ isFulWet = if use_Q_flow_nominal then (X_wSatTWatOut <= X_wAirIn) else true;
+ assert(
+ not use_Q_flow_nominal or
+ hAirOut >= hSatTWatIn and hAirIn >= hSatTWatOut or
+ hAirOut <= hSatTWatIn and hAirIn <= hSatTWatOut,
+ "In " + getInstanceName() +
+ ": The moist air enthalpy at the coil inlet or outlet is unrealistically low. " +
+ "Check the rated conditions.");
+ assert(
+ isFulDry or isFulWet,
+ "In " + getInstanceName() +
+ ": The nominal conditions correspond to a partially-wet coil regime. " +
+ "The modeling uncertainty under such conditions has not been assessed. " +
+ "Rather specify nominal conditions in fully-dry or fully-wet regime.",
+ level=AssertionLevel.warning);
+ if use_Q_flow_nominal then
+ if isFulDry then
+ TAirOut = TAirIn + QTot_flow / mAir_flow / cpAir;
+ LMED=Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
+ TWatIn,
+ TWatOut,
+ TAirIn,
+ TAirOut) / TUnit * hUnit;
+ QTot_flow=LMED*UASta;
+ cpEff = 0;
+ UA = UASta*cpUnit;
+ else //fully wet
+ // calculation of overall UAsta based on log mean enthalpy difference
+ LMED=Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
+ hSatTWatIn/hUnit*TUnit,
+ hSatTWatOut/hUnit*TUnit,
+ hAirIn/hUnit*TUnit,
+ hAirOut/hUnit*TUnit) / TUnit * hUnit;
+ QTot_flow=LMED*UASta;
+ cpEff= (hSatTWatOut-hSatTWatIn)/(TWatOut-TWatIn);
+ UASta = (UAAir/cpAir)/(1 + (cpEff*UAAir)/(cpAir*UAWat));
+ // Dummy value.
+ TAirOut=MediumA.T_default;
+ end if;
+ else
+ // Dummy values.
+ TAirIn=MediumA.T_default;
+ TAirOut=MediumA.T_default;
+ X_wAirIn=MediumA.X_default[1];
+ TWatIn=MediumA.T_default;
+ TWatOut=MediumA.T_default;
+ hAirIn=MediumA.h_default;
+ hAirOut=MediumA.h_default;
+ LMED=hUnit;
+ -QTot_flow=LMED*UASta;
+ cpEff= 0;
+ end if;
+
+ UAWat = UAAir / r_nominal;
+ UA = 1/ (1/UAAir + 1/UAWat);
+
+ annotation (Icon(coordinateSystem(preserveAspectRatio=false),
+ graphics={
+ Rectangle(
+ extent={{100,-98},{-100,100}},
+ lineColor={0,0,0},
+ fillColor={255,255,255},
+ fillPattern=FillPattern.Solid)}), Diagram(
+ coordinateSystem(preserveAspectRatio=false)),
+ Documentation(revisions="
+
+-
+February 18, 2021 by Donghun Kim:
+First implementation
+
+
+", info="
+
+This model calculates the overall heat transfer coefficient, i.e.,
+UA-value, from cooling coil data at rated conditions.
+
+
+The main limitation of the current implementation is that the rated
+conditions should correspond to a fully-dry or a fully-wet coil regime.
+The modeling uncertainty yielded by partially-wet rated conditions
+has not been assessed yet.
+
+"));
+end WetCoilUARated;
diff --git a/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilWetRegime.mo b/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilWetRegime.mo
new file mode 100644
index 00000000000..f8044abf926
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/BaseClasses/WetCoilWetRegime.mo
@@ -0,0 +1,265 @@
+within Buildings.Fluid.HeatExchangers.BaseClasses;
+model WetCoilWetRegime
+ "Fully wet coil model using esilon_C.mo function"
+ constant Real cpEff0=2050 "Used for scaling";
+ constant Real cpWat0=4200 "Used for scaling";
+ parameter Real delta = 1E-3 "Small value used for smoothing";
+ constant Modelica.SIunits.SpecificHeatCapacity cpDum=1
+ "Dummy cp to eliminate the warning message of the unit mismatch when using the eps-NTU model for the wet coil";
+ constant Modelica.SIunits.TemperatureDifference dTWat=0.1;
+ parameter Real tau=6*60
+ "Time constant for the state estimation: introduced to avoid the algebraic loop of the wet coil equations";
+
+ // - water
+ input Modelica.SIunits.ThermalConductance UAWat
+ "UA for water side";
+ input Modelica.SIunits.MassFlowRate mWat_flow
+ "Mass flow rate for water";
+ input Modelica.SIunits.MassFlowRate mWatNonZer_flow
+ "None-zero Mass flow rate for water";
+ input Modelica.SIunits.SpecificHeatCapacity cpWat
+ "Specific heat capacity of water";
+ input Modelica.SIunits.Temperature TWatIn
+ "Water temperature at inlet";
+ input Modelica.SIunits.MassFlowRate mWat_flow_nominal;
+ // -- air
+ input Modelica.SIunits.Pressure pAir
+ "Pressure on air-side of coil";
+ input Modelica.SIunits.ThermalConductance UAAir
+ "UA for air side";
+ input Modelica.SIunits.MassFlowRate mAir_flow
+ "Mass flow rate of air";
+ input Modelica.SIunits.MassFlowRate mAirNonZer_flow
+ "None-zero Mass flow rate for water";
+ input Modelica.SIunits.SpecificHeatCapacity cpAir
+ "Specific heat capacity of moist air at constant pressure";
+ input Modelica.SIunits.Temperature TAirIn
+ "Temperature of air at inlet";
+ input Modelica.SIunits.MassFraction X_wAirIn
+ "Mass fraction of water in moist air at inlet";
+ input Buildings.Fluid.Types.HeatExchangerFlowRegime cfg
+ "The configuration of the heat exchanger";
+ input Modelica.SIunits.MassFlowRate mAir_flow_nominal;
+
+ Modelica.SIunits.SpecificEnthalpy hAirIn
+ "Specific enthalpy of air at inlet conditions";
+ Buildings.Utilities.Psychrometrics.hSat_pTSat hSatWatInM(p=pAir,TSat=TWatIn)
+ "Model to calculate saturated specific enthalpy of air at water inlet temperature";
+ Modelica.SIunits.SpecificEnthalpy hSatWatIn
+ "Saturated specific enthalpy of air at water inlet temperature";
+
+ Buildings.Utilities.Psychrometrics.hSat_pTSat hSatWatIn_dT_M(p=pAir,TSat=TWatIn+dTWat)
+ "Model to calculate derivative of saturated specific enthalpy of air at water inlet temperature";
+ Modelica.SIunits.SpecificHeatCapacity dhSatdTWatIn
+ "Deriviative of saturated moist air enthalpy at water inlet temperature";
+ Real NonZerDelWatTem
+ "Regularization water temperature difference betwee inlet and outlet";
+
+
+ Modelica.SIunits.SpecificEnthalpy hAirOut
+ "Specific enthalpy of moist air at the air outlet";
+ Buildings.Utilities.Psychrometrics.hSat_pTSat hSatWatOutM(p=pAir,TSat=TWatOutEst)
+ "Model to calculate saturated specific enthalpy of air at water outlet temperature";
+ Modelica.SIunits.SpecificEnthalpy hSatWatOut
+ "Saturated specific enthalpy of air at water outlet temperature";
+
+ Modelica.SIunits.Temperature TSurEff
+ "Effective surface temperature of the coil to split sensible and latent heat from total heat transfer rate";
+
+ Modelica.SIunits.SpecificEnthalpy hSatSurEff
+ "Enthalpy of saturated moist air at the effective surface temperature";
+
+ Buildings.Utilities.Psychrometrics.hSat_pTSat hSatSurEffM(p=pAir,TSat=TSurEff)
+ "An object to calculate the saturated enthalpy of moist air at the coil surface temperature";
+ Buildings.Utilities.Psychrometrics.hSat_pTSat hSatSurEffMinM(p=pAir,TSat=273.15+1)
+ "An object to calculate a lower bound of the saturated enthalpy of moist
+ air at the coil surface temperature";
+
+ Modelica.SIunits.SpecificHeatCapacity cpEff
+ "Effective specific heat: change in enthalpy with respect to temperature
+ along the saturation line at the local water temperature";
+
+
+ Modelica.SIunits.MassFlowRate UASta
+ "Overall mass transfer coefficient for dry coil";
+
+ Real NTUAirSta(unit="1")
+ "Number of transfer units for air-side only (NTU_a*)";
+
+ Real epsSta(start=0.66, unit="1")
+ "Effectiveness for heat exchanger (e*)";
+
+ Modelica.SIunits.MassFlowRate CStaMin
+ "Min of product of mass flow rates and specific heats; analogous to Cmin";
+
+ Modelica.SIunits.MassFlowRate CStaMin_flow_nominal= min(
+ mAir_flow_nominal,mWat_flow_nominal*cpEff0/cpWat0)
+ "Analogus to CMin_flow_nominal, only for a regularization";
+ Modelica.SIunits.MassFlowRate CStaMax_flow_nominal= max(
+ mAir_flow_nominal,mWat_flow_nominal*cpEff0/cpWat0)
+ "Analogus to CMax_flow_nominal, only for a regularization";
+ Modelica.SIunits.MassFlowRate deltaCStaMin=delta*min(
+ mAir_flow_nominal,mWat_flow_nominal*cpEff0/cpWat0)
+ "Min of product of mass flow rates and specific heats, analogous to Cmin";
+ Modelica.SIunits.Temperature TWatOutEst
+ "State_estimation of Temperature of water at outlet";
+
+ output Modelica.SIunits.HeatFlowRate QTot_flow
+ "Total heat flow from water to air stream";
+ output Modelica.SIunits.HeatFlowRate QSen_flow
+ "Sensible heat flow from water to air stream";
+ output Modelica.SIunits.Temperature TWatOut
+ "Temperature at the water outlet";
+ output Modelica.SIunits.Temperature TSurAirIn
+ "Coil surface temperature at the air inlet";
+ output Modelica.SIunits.Temperature TAirOut
+ "Temperature at the air outlet";
+initial equation
+ TWatOutEst=0.5*(TWatIn+ TAirIn);
+
+equation
+
+ hAirIn=Buildings.Media.Air.specificEnthalpy_pTX(p=pAir,T=TAirIn,X={X_wAirIn,1-X_wAirIn});
+ hSatWatIn=hSatWatInM.hSat;
+ dhSatdTWatIn=(hSatWatIn_dT_M.hSat-hSatWatInM.hSat)/dTWat; // dTWat is a parameter
+ hSatWatOut= hSatWatOutM.hSat;
+ NonZerDelWatTem=Buildings.Utilities.Math.Functions.regNonZeroPower(x=TWatOutEst-TWatIn,n=1,delta=0.1);
+ cpEff = Buildings.Utilities.Math.Functions.smoothMax(
+ (hSatWatOut - hSatWatIn)/NonZerDelWatTem,
+ dhSatdTWatIn,
+ cpEff0*delta);
+
+ CStaMin=Buildings.Utilities.Math.Functions.smoothMin(
+ mAir_flow,
+ mWat_flow*cpWat/cpEff,
+ deltaCStaMin/4);
+
+ UASta = (UAAir/cpAir)/(1 + (cpEff*UAAir)/(cpAir*UAWat));
+
+ epsSta=epsilon_C(
+ UA=UASta*cpDum,
+ C1_flow=mWat_flow*cpWat/cpEff*cpDum,
+ C2_flow=mAir_flow*cpDum,
+ flowRegime=Integer(cfg),
+ CMin_flow_nominal=CStaMin_flow_nominal*cpDum,
+ CMax_flow_nominal=CStaMax_flow_nominal*cpDum,
+ delta=delta);
+
+ QTot_flow = epsSta*CStaMin*(hAirIn - hSatWatIn);
+
+ QTot_flow = mAir_flow*(hAirIn- hAirOut);
+ QTot_flow = mWat_flow*cpWat*(TWatOut-TWatIn);
+
+ NTUAirSta = UAAir/(mAir_flow*cpAir);
+
+ hSatSurEff = Buildings.Utilities.Math.Functions.smoothMax(
+ x1 = hSatSurEffMinM.hSat,
+ x2 = hAirIn +(hAirOut - hAirIn) / (1 - exp(-NTUAirSta)),
+ deltaX = delta*1E4); // NTUAirSta is bounded as long as UAAir>0 due to the regularization of mAir_flow
+
+ hSatSurEffM.hSat=hSatSurEff;
+ TAirOut = TSurEff +(TAirIn - TSurEff)*exp(-NTUAirSta);
+ QSen_flow= Buildings.Utilities.Math.Functions.smoothMin(
+ x1 = mAir_flow*cpAir*(TAirIn-TAirOut),
+ x2 = QTot_flow,
+ deltaX = delta*mWatNonZer_flow*cpWat0*5); // the last term is only for regularization with DTWater=5oC
+
+ (TAirIn-TSurAirIn)*UAAir=(TSurAirIn-TWatOut)*UAWat;
+ der(TWatOutEst)=-1/tau*TWatOutEst+1/tau*TWatOut;
+
+annotation (Icon(graphics={
+ Rectangle(
+ extent={{-100,100},{100,-100}},
+ lineColor={28,108,200},
+ fillColor={170,213,255},
+ fillPattern=FillPattern.Solid)}), Documentation(revisions="
+
+- Jan 21, 2021, by Donghun Kim:
First implementation of the fuzzy model.
+See
+
+issue 622
+for more information.
+
+
+", info="
+
+This model implements the calculation for a 100% wet coil.
+
+
+The equations from Braun (1988) and Mitchell and Braun (2012a and b),
+which are essentially the extension of the ε-NTU approach to
+simultaneous sensible and latent heat transfer, are utilized.
+
+
+The mathematical equations are analogous to that of the sensible heat exchanger.
+However, the key distinction is from that the heat transfer is driven by an enthalpy difference
+not by an temperature difference. This change in the driving potential results in re-defining
+capacitances and heat transfer coefficients accordinlgy.
+
+
+
+The total heat transfer rate is expressed as
+
+
+ Qtot=ε* C*min
+(hair,in-hsat(Twat,in)),
+
+
+where ε*=f(Cr*,NTU*) and f is the same ε-NTU relationships
+(depending on the heat exchanger configuration) for the sensible heat exchanger.
+
+
+hair,in and hsat(Twat,in) are
+the specific enthalpies of the incoming moist air and saturated moist air
+at the water inlet temperature.
+
+
+The capacitances of water and air streams are defined as
+
+C*air=mair and
+C*wat=mwatcp,wat/csat,
+
+
+where csat is an specific heat capacity, which indicates the sensitivity
+of the enthalpy of the staturated moist air w.r.t. the temperature, and is defined
+here as csat=(hsat(Twat,out)-hsat(Twat,in))
+/(Twat,out-Twat,in).
+
+
+The capacitance ratio and minimum capacitance are naturally defined as
+
+ Cr*=min(C*air,C*wat)/max(C*air,C*wat)
+and C*min=min(C*air,C*wat).
+
+
+The number of transfer unit for the wet-coil is defined as NTU*=UA*/C*min, where
+
+
+UA*=1/(1/(UAair/cp,air)+1/(UAwat/csat).
+
+
+References
+
+Braun, James E. 1988.
+"Methodologies for the Design and Control of Central Cooling Plants".
+PhD Thesis. University of Wisconsin - Madison.
+Available
+
+online.
+
+
+Mitchell, John W., and James E. Braun. 2012a.
+Principles of heating, ventilation, and air conditioning in buildings.
+Hoboken, N.J.: Wiley.
+
+
+Mitchell, John W., and James E. Braun. 2012b.
+"Supplementary Material Chapter 2: Heat Exchangers for Cooling Applications".
+Excerpt from Principles of heating, ventilation, and air conditioning in buildings.
+Hoboken, N.J.: Wiley.
+Available
+
+online.
+
+"));
+end WetCoilWetRegime;
diff --git a/Buildings/Fluid/HeatExchangers/BaseClasses/determineWaterIndex.mo b/Buildings/Fluid/HeatExchangers/BaseClasses/determineWaterIndex.mo
new file mode 100644
index 00000000000..d5c7afacc98
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/BaseClasses/determineWaterIndex.mo
@@ -0,0 +1,49 @@
+within Buildings.Fluid.HeatExchangers.BaseClasses;
+function determineWaterIndex
+ "Determine the index of water in a 2-component medium model"
+ input String[:] substanceNames "Names of substances of media";
+ output Integer idxWat "Index of water";
+protected
+ Boolean found(fixed=false) "Flag, used for error checking";
+ Integer N = size(substanceNames, 1) "Number of substances";
+algorithm
+ found:=false;
+ idxWat := 1;
+ for i in 1:N loop
+ if Modelica.Utilities.Strings.isEqual(
+ string1=substanceNames[i],
+ string2="water",
+ caseSensitive=false) then
+ idxWat := i;
+ found := true;
+ end if;
+ end for;
+ assert(found,
+ "Did not find medium species 'water' in the medium model. " +
+ "Change medium model.");
+ annotation (Documentation(revisions="
+
+-
+April 19, 2017, by Michael Wetter:
+Removed assertion as function is valid also for other values than N==2.
+
+-
+March 17, 2017, by Michael O'Keefe:
+First implementation. See
+
+issue 622 for more information.
+
+
+", info="
+
+Given an array of strings representing substance names, this function returns
+the integer index of the substance named \"water\" (case-insensitive).
+
+
+
+This function is useful to automate lookup up the index of water within a media
+so as to avoid hard-coding or guessing what the index will be. Typically, this
+function would be run once at initialization time.
+
+"));
+end determineWaterIndex;
diff --git a/Buildings/Fluid/HeatExchangers/BaseClasses/package.order b/Buildings/Fluid/HeatExchangers/BaseClasses/package.order
index 3dfbd5d39be..aced07a5558 100644
--- a/Buildings/Fluid/HeatExchangers/BaseClasses/package.order
+++ b/Buildings/Fluid/HeatExchangers/BaseClasses/package.order
@@ -20,6 +20,11 @@ PipeManifoldFixedResistance
PipeManifoldFlowDistributor
PipeManifoldNoResistance
RayleighNumber
+WetCoilDryRegime
+WetCoilDryWetRegime
+WetCoilUARated
+WetCoilWetRegime
+determineWaterIndex
dynamicViscosityWater
epsilon_C
epsilon_ntuZ
diff --git a/Buildings/Fluid/HeatExchangers/Examples/WetCoilEffectivenessNTUMassFlow.mo b/Buildings/Fluid/HeatExchangers/Examples/WetCoilEffectivenessNTUMassFlow.mo
new file mode 100644
index 00000000000..4f03b14ab56
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/Examples/WetCoilEffectivenessNTUMassFlow.mo
@@ -0,0 +1,85 @@
+within Buildings.Fluid.HeatExchangers.Examples;
+model WetCoilEffectivenessNTUMassFlow
+ "Model that tests the wet coil effectiveness-NTU model with variable mass flow rates"
+ extends Modelica.Icons.Example;
+ extends
+ Buildings.Fluid.HeatExchangers.Examples.BaseClasses.EffectivenessNTUMassFlow(
+ sou_1(nPorts=1),
+ sin_1(nPorts=1),
+ sou_2(nPorts=1),
+ sin_2(nPorts=1));
+
+ Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU hex(
+ redeclare package Medium1 = Medium1,
+ redeclare package Medium2 = Medium2,
+ m1_flow_nominal=m1_flow_nominal,
+ m2_flow_nominal=m2_flow_nominal,
+ dp2_nominal(displayUnit="Pa") = 200,
+ dp1_nominal(displayUnit="Pa") = 3000,
+ UA_nominal=Q_flow_nominal/Buildings.Fluid.HeatExchangers.BaseClasses.lmtd(
+ T_a1_nominal,
+ T_b1_nominal,
+ T_a2_nominal,
+ T_b2_nominal),
+ show_T=true,
+ energyDynamics=Modelica.Fluid.Types.Dynamics.SteadyState)
+ "Heat exchanger"
+ annotation (Placement(transformation(extent={{80,20},{100,40}})));
+
+ Sensors.RelativeHumidityTwoPort senRelHum(
+ redeclare package Medium = Medium2,
+ m_flow_nominal=m2_flow_nominal)
+ "Relative humidity sensor"
+ annotation (Placement(transformation(extent={{60,14},{40,34}})));
+
+equation
+ connect(sou_1.ports[1], hex.port_a1) annotation (Line(
+ points={{18,62},{60,62},{60,36},{80,36}},
+ color={0,127,255},
+ smooth=Smooth.None));
+ connect(hex.port_b1, sin_1.ports[1]) annotation (Line(
+ points={{100,36},{108,36},{108,60},{120,60}},
+ color={0,127,255},
+ smooth=Smooth.None));
+ connect(hex.port_a2, sou_2.ports[1]) annotation (Line(
+ points={{100,24},{118,24}},
+ color={0,127,255},
+ smooth=Smooth.None));
+ connect(hex.port_b2, senRelHum.port_a) annotation (Line(
+ points={{80,24},{60,24}},
+ color={0,127,255},
+ smooth=Smooth.None));
+ connect(senRelHum.port_b, sin_2.ports[1]) annotation (Line(
+ points={{40,24},{20,24}},
+ color={0,127,255},
+ smooth=Smooth.None));
+ annotation (
+ experiment(Tolerance=1E-6, StopTime=3600),
+ __Dymola_Commands(
+ file="modelica://Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Examples/WetCoilEffectivenessNTUMassFlow.mos"
+ "Simulate and plot"),
+ Diagram(coordinateSystem(preserveAspectRatio=true,
+ extent={{-100, -100},{200,200}})),
+ Documentation(revisions="
+
+-
+March 17, 2017, by Michael O'Keefe:
+First implementation. See
+
+issue 622 for more information.
+
+
+", info="
+
+This example is similar to
+
+Buildings.Fluid.HeatExchangers.Examples.WetCoilCounterFlowMassFlow
+except that the coil model
+
+Buildings.Fluid.HeatExchangers.WetCoilCounterFlow
+is replaced here by
+
+Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU.
+
+"));
+end WetCoilEffectivenessNTUMassFlow;
diff --git a/Buildings/Fluid/HeatExchangers/Examples/package.order b/Buildings/Fluid/HeatExchangers/Examples/package.order
index ea588a6a00b..2ad9a3f6d95 100644
--- a/Buildings/Fluid/HeatExchangers/Examples/package.order
+++ b/Buildings/Fluid/HeatExchangers/Examples/package.order
@@ -14,4 +14,5 @@ WetCoilCounterFlowMassFlow
WetCoilCounterFlowPControl
WetCoilDiscretizedMassFlow
WetCoilDiscretizedPControl
+WetCoilEffectivenessNTUMassFlow
BaseClasses
diff --git a/Buildings/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTU.mo b/Buildings/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTU.mo
new file mode 100644
index 00000000000..641a63f48be
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTU.mo
@@ -0,0 +1,305 @@
+within Buildings.Fluid.HeatExchangers.Validation;
+model WetCoilEffectivenessNTU
+ "Model that validates the wet coil effectiveness-NTU model"
+ extends Modelica.Icons.Example;
+
+ package Medium_W = Buildings.Media.Water;
+ package Medium_A = Buildings.Media.Air;
+
+ constant Modelica.SIunits.AbsolutePressure pAtm = 101325
+ "Atmospheric pressure";
+
+ parameter Modelica.SIunits.Temperature T_a1_nominal=
+ Modelica.SIunits.Conversions.from_degF(42)
+ "Inlet water temperature";
+ parameter Modelica.SIunits.Temperature T_a2_nominal=
+ Modelica.SIunits.Conversions.from_degF(80)
+ "Inlet air temperature";
+ parameter Modelica.SIunits.Temperature T_b1_nominal=
+ 273.15+11.0678
+ "Outlet water temperature in fully wet conditions";
+ parameter Modelica.SIunits.Temperature T_b2_nominal=
+ 273.15+13.5805
+ "Outlet air temperature in fully wet conditions";
+ final parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal=
+ m1_flow_nominal * 4186 * (T_a1_nominal - T_b1_nominal);
+ parameter Real X_w_a2_nominal = 0.0173
+ "Inlet water mass fraction in fully wet conditions";
+ parameter Modelica.SIunits.ThermalConductance UA_nominal = 4748
+ "Total thermal conductance at nominal flow, from textbook";
+ parameter Modelica.SIunits.MassFlowRate m1_flow_nominal = 3.78
+ "Nominal mass flow rate of water";
+ parameter Modelica.SIunits.MassFlowRate m2_flow_nominal = 2.646
+ "Nominal mass flow rate of air";
+ parameter Types.HeatExchangerConfiguration hexCon=
+ Types.HeatExchangerConfiguration.CounterFlow
+ "Heat exchanger configuration";
+ Buildings.Fluid.Sources.Boundary_pT sinAir(
+ redeclare package Medium = Medium_A,
+ use_p_in=false,
+ nPorts=3)
+ "Air sink"
+ annotation (Placement(transformation(extent={{-180,-72},{-160,-52}})));
+ Sources.MassFlowSource_T souAir(
+ redeclare package Medium = Medium_A,
+ m_flow=m2_flow_nominal,
+ T=T_a2_nominal,
+ use_Xi_in=true,
+ nPorts=1)
+ "Air source"
+ annotation (Placement(transformation(extent={{140,-70},{120,-50}})));
+ Buildings.Fluid.Sources.Boundary_pT sinWat(
+ redeclare package Medium = Medium_W,
+ nPorts=3)
+ "Sink for water"
+ annotation (Placement(transformation(extent={{50,10},{30,30}})));
+ Buildings.Utilities.Psychrometrics.ToTotalAir conversion
+ annotation (Placement(transformation(extent={{190,-90},{170,-70}})));
+ Sensors.RelativeHumidityTwoPort relHumIn(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Inlet relative humidity"
+ annotation (Placement(transformation(extent={{40,-70},{20,-50}})));
+ Sensors.TemperatureTwoPort TDryBulIn(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Inlet dry bulb temperature"
+ annotation (Placement(transformation(extent={{70,-70},{50,-50}})));
+ Modelica.Blocks.Sources.RealExpression pAir(y=pAtm) "Air pressure"
+ annotation (Placement(transformation(extent={{140,-42},{120,-18}})));
+ Buildings.Utilities.Psychrometrics.TWetBul_TDryBulXi wetBulIn(redeclare
+ package Medium = Medium_A) "Computation of wet bulb temperature"
+ annotation (Placement(transformation(extent={{120,-10},{140,10}})));
+ Sensors.MassFractionTwoPort senMasFraIn(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Water mass fraction of entering air"
+ annotation (Placement(transformation(extent={{110,-70},{90,-50}})));
+ Sensors.MassFractionTwoPort senMasFraOut(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Water mass fraction of leaving air"
+ annotation (Placement(transformation(extent={{-110,-10},{-130,10}})));
+ Sensors.TemperatureTwoPort TDryBulOut(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Dry bulb temperature of leaving air"
+ annotation (Placement(transformation(extent={{-50,-10},{-70,10}})));
+ Buildings.Utilities.Psychrometrics.TWetBul_TDryBulXi wetBulOut(redeclare
+ package Medium = Medium_A) "Computation of wet bulb temperature"
+ annotation (Placement(transformation(extent={{-40,-90},{-20,-70}})));
+ Modelica.Blocks.Sources.RealExpression pAir1(y=pAtm) "Air pressure"
+ annotation (Placement(transformation(extent={{-100,-112},{-80,-88}})));
+ Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU hexWetNTU(
+ redeclare package Medium1 = Medium_W,
+ redeclare package Medium2 = Medium_A,
+ UA_nominal=UA_nominal,
+ m1_flow_nominal=m1_flow_nominal,
+ m2_flow_nominal=m2_flow_nominal,
+ dp2_nominal=0,
+ dp1_nominal=0,
+ configuration=hexCon,
+ show_T=true) "Effectiveness-NTU coil model (parameterized with nominal UA)"
+ annotation (Placement(transformation(extent={{-30,4},{-10,24}})));
+ Sources.MassFlowSource_T souWat1(
+ redeclare package Medium = Medium_W,
+ m_flow=m1_flow_nominal,
+ T=T_a1_nominal,
+ nPorts=1)
+ "Source for water"
+ annotation (Placement(transformation(extent={{-180,10},{-160,30}})));
+ WetCoilCounterFlow hexDis(
+ redeclare package Medium1 = Medium_W,
+ redeclare package Medium2 = Medium_A,
+ m1_flow_nominal=m1_flow_nominal,
+ m2_flow_nominal=m2_flow_nominal,
+ dp2_nominal=0,
+ allowFlowReversal1=false,
+ allowFlowReversal2=false,
+ dp1_nominal=0,
+ UA_nominal=UA_nominal,
+ show_T=true,
+ nEle=30,
+ energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
+ tau1=0.1,
+ tau2=0.1,
+ tau_m=0.1)
+ "Discretized coil model"
+ annotation (Placement(transformation(extent={{-30,56},{-10,76}})));
+ Sources.MassFlowSource_T souWat(
+ redeclare package Medium = Medium_W,
+ m_flow=m1_flow_nominal,
+ T=T_a1_nominal,
+ nPorts=1) "Source for water"
+ annotation (Placement(transformation(extent={{-180,70},{-160,90}})));
+ Sources.MassFlowSource_T souAir2(
+ redeclare package Medium = Medium_A,
+ m_flow=m2_flow_nominal,
+ T=T_a2_nominal,
+ use_Xi_in=true,
+ nPorts=1)
+ "Air source"
+ annotation (Placement(transformation(extent={{140,30},{120,50}})));
+ Sensors.MassFractionTwoPort senMasFraOut1(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Water mass fraction of leaving air"
+ annotation (Placement(transformation(extent={{-110,50},{-130,70}})));
+ Sensors.TemperatureTwoPort TDryBulOut1(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Dry bulb temperature of leaving air"
+ annotation (Placement(transformation(extent={{-50,50},{-70,70}})));
+ Sensors.RelativeHumidityTwoPort relHumOut_eps(redeclare package Medium =
+ Medium_A, m_flow_nominal=m2_flow_nominal) "Outlet relative humidity"
+ annotation (Placement(transformation(extent={{-80,-10},{-100,10}})));
+ Sensors.RelativeHumidityTwoPort relHumOut_dis(redeclare package Medium =
+ Medium_A, m_flow_nominal=m2_flow_nominal) "Outlet relative humidity"
+ annotation (Placement(transformation(extent={{-80,50},{-100,70}})));
+ Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU hexWetNTU_TX(
+ redeclare package Medium1 = Medium_W,
+ redeclare package Medium2 = Medium_A,
+ use_Q_flow_nominal=true,
+ Q_flow_nominal=Q_flow_nominal,
+ T_a2_nominal=T_a2_nominal,
+ w_a2_nominal=X_w_a2_nominal/(1 - X_w_a2_nominal),
+ T_a1_nominal=T_a1_nominal,
+ m1_flow_nominal=m1_flow_nominal,
+ m2_flow_nominal=m2_flow_nominal,
+ dp2_nominal=0,
+ dp1_nominal=0,
+ configuration=hexCon,
+ show_T=true)
+ "Effectiveness-NTU coil model (parameterized with nominal T and X)"
+ annotation (Placement(transformation(extent={{-30,-44},{-10,-24}})));
+ Sources.MassFlowSource_T souAir1(
+ redeclare package Medium = Medium_A,
+ m_flow=m2_flow_nominal,
+ T=T_a2_nominal,
+ use_Xi_in=true,
+ nPorts=1)
+ "Air source"
+ annotation (Placement(transformation(extent={{140,-110},{120,-90}})));
+ Sources.MassFlowSource_T souWat2(
+ redeclare package Medium = Medium_W,
+ m_flow=m1_flow_nominal,
+ T=T_a1_nominal,
+ nPorts=1)
+ "Source for water"
+ annotation (Placement(transformation(extent={{-180,-30},{-160,-10}})));
+ Modelica.Blocks.Sources.CombiTimeTable w_a2(table=[0,0.0035383; 1,0.01765],
+ timeScale=1000)
+ "Absolute humidity of entering air"
+ annotation (Placement(transformation(extent={{196,-34},{176,-14}})));
+equation
+ connect(pAir.y, wetBulIn.p) annotation (Line(points={{119,-30},{112,-30},{112,
+ -8},{119,-8}}, color={0,0,127}));
+ connect(pAir1.y, wetBulOut.p) annotation (Line(points={{-79,-100},{-50,-100},
+ {-50,-88},{-41,-88}},
+ color={0,0,127}));
+ connect(senMasFraOut.port_b, sinAir.ports[1])
+ annotation (Line(points={{-130,0},{-140,0},{-140,-59.3333},{-160,-59.3333}},
+ color={0,127,255}));
+ connect(TDryBulOut.T, wetBulOut.TDryBul)
+ annotation (Line(points={{-60,11},{-60,14},{-44,14},{-44,-72},{-41,-72}},
+ color={0,0,127}));
+ connect(senMasFraOut.X, wetBulOut.Xi[1]) annotation (Line(points={{-120,11},{
+ -120,14},{-134,14},{-134,-80},{-41,-80}}, color={0,0,127}));
+ connect(souAir.ports[1], senMasFraIn.port_a)
+ annotation (Line(points={{120,-60},{110,-60}}, color={0,127,255}));
+ connect(senMasFraIn.port_b, TDryBulIn.port_a)
+ annotation (Line(points={{90,-60},{70,-60}}, color={0,127,255}));
+ connect(senMasFraIn.X, wetBulIn.Xi[1])
+ annotation (Line(points={{100,-49},{100,0},{119,0}}, color={0,0,127}));
+ connect(TDryBulIn.T, wetBulIn.TDryBul)
+ annotation (Line(points={{60,-49},{60,8},{119,8}}, color={0,0,127}));
+ connect(TDryBulIn.port_b, relHumIn.port_a)
+ annotation (Line(points={{50,-60},{40,-60}}, color={0,127,255}));
+ connect(souWat1.ports[1], hexWetNTU.port_a1) annotation (Line(points={{-160,20},
+ {-30,20}}, color={0,127,255}));
+ connect(hexWetNTU.port_b1, sinWat.ports[1]) annotation (Line(points={{-10,20},
+ {16,20},{16,22.6667},{30,22.6667}},
+ color={0,127,255}));
+ connect(souWat.ports[1], hexDis.port_a1) annotation (Line(points={{-160,80},{-40,
+ 80},{-40,72},{-30,72}}, color={0,127,255}));
+ connect(hexDis.port_b1, sinWat.ports[2]) annotation (Line(points={{-10,72},{20,
+ 72},{20,20},{30,20}}, color={0,127,255}));
+ connect(souAir2.ports[1], hexDis.port_a2) annotation (Line(points={{120,40},{
+ 0,40},{0,60},{-10,60}}, color={0,127,255}));
+ connect(hexWetNTU.port_b2, TDryBulOut.port_a) annotation (Line(points={{-30,8},
+ {-40,8},{-40,0},{-50,0}}, color={0,127,255}));
+ connect(hexWetNTU.port_a2, relHumIn.port_b) annotation (Line(points={{-10,8},
+ {10,8},{10,-60},{20,-60}},
+ color={0,127,255}));
+ connect(hexDis.port_b2, TDryBulOut1.port_a)
+ annotation (Line(points={{-30,60},{-50,60}}, color={0,127,255}));
+ connect(senMasFraOut1.port_b, sinAir.ports[2]) annotation (Line(points={{-130,60},
+ {-150,60},{-150,-62},{-160,-62}}, color={0,127,255}));
+ connect(TDryBulOut.port_b, relHumOut_eps.port_a) annotation (Line(points={{
+ -70,0},{-76,0},{-76,0},{-80,0}}, color={0,127,255}));
+ connect(relHumOut_eps.port_b, senMasFraOut.port_a)
+ annotation (Line(points={{-100,0},{-110,0}}, color={0,127,255}));
+ connect(TDryBulOut1.port_b, relHumOut_dis.port_a)
+ annotation (Line(points={{-70,60},{-80,60}}, color={0,127,255}));
+ connect(relHumOut_dis.port_b, senMasFraOut1.port_a)
+ annotation (Line(points={{-100,60},{-110,60}}, color={0,127,255}));
+ connect(hexWetNTU_TX.port_b1, sinWat.ports[3]) annotation (Line(points={{-10,-28},
+ {20,-28},{20,17.3333},{30,17.3333}}, color={0,127,255}));
+ connect(souAir1.ports[1], hexWetNTU_TX.port_a2) annotation (Line(points={{120,
+ -100},{0,-100},{0,-40},{-10,-40}}, color={0,127,255}));
+ connect(sinAir.ports[3], hexWetNTU_TX.port_b2) annotation (Line(points={{-160,
+ -64.6667},{-150,-64.6667},{-150,-64},{-138,-64},{-138,-40},{-30,-40}},
+ color={0,127,255}));
+ connect(souWat2.ports[1], hexWetNTU_TX.port_a1) annotation (Line(points={{-160,
+ -20},{-40,-20},{-40,-28},{-30,-28}}, color={0,127,255}));
+ connect(w_a2.y[1], conversion.XiDry) annotation (Line(points={{175,-24},{172,
+ -24},{172,-50},{196,-50},{196,-80},{191,-80}}, color={0,0,127}));
+ connect(conversion.XiTotalAir, souAir.Xi_in[1]) annotation (Line(points={{169,
+ -80},{158,-80},{158,-64},{142,-64}}, color={0,0,127}));
+ connect(conversion.XiTotalAir, souAir1.Xi_in[1]) annotation (Line(points={{
+ 169,-80},{154,-80},{154,-104},{142,-104}}, color={0,0,127}));
+ connect(conversion.XiTotalAir, souAir2.Xi_in[1]) annotation (Line(points={{
+ 169,-80},{158,-80},{158,36},{142,36}}, color={0,0,127}));
+ annotation (Diagram(coordinateSystem(preserveAspectRatio=true,
+ extent={{-200,-120},{200,120}})),
+ experiment(
+ StopTime=1000,
+ Tolerance=1e-06),
+ __Dymola_Commands(
+ file="Resources/Scripts/Dymola/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTU.mos"
+ "Simulate and plot"),
+ Documentation(info="
+
+This model duplicates an example from Mitchell and Braun 2012, example SM-2-1
+(Mitchell and Braun 2012) to validate a single case for the
+
+Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU
+model.
+
+Validation
+
+The example simulates a wet coil with constant air
+and water inlet temperature and mass flow rate, and an increasing air inlet
+humidity which triggers the transition from a fully-dry to a fully-wet regime.
+The reference used for validation is the published experimental data.
+A discretized wet coil model is also simulated for comparison.
+To provide an accurate reference, the latter model is configured with 30 elements.
+Under steady-state modeling assumptions, this creates a large system of
+non-linear equations. To alleviate this effect, dynamics are considered but
+the simulation time is increased to 1000 s to reproduce quasi steady-state
+conditions.
+
+
+Note that the outlet air relative humidity may slightly exceed 100% when using
+the epsilon-NTU model.
+
+References
+
+Mitchell, John W., and James E. Braun. 2012.
+\"Supplementary Material Chapter 2: Heat Exchangers for Cooling Applications\".
+Excerpt from Principles of heating, ventilation, and air conditioning in buildings.
+Hoboken, N.J.: Wiley. Available online:
+
+http://bcs.wiley.com/he-bcs/Books?action=index&itemId=0470624574&bcsId=7185
+
+", revisions="
+
+-
+April 19, 2017, by Michael Wetter:
+Revised model to avoid mixing textual equations and connect statements.
+
+-
+March 17, 2017, by Michael O'Keefe:
+First implementation. See
+
+issue 622 for more information.
+
+
+"));
+end WetCoilEffectivenessNTU;
diff --git a/Buildings/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTUHeating.mo b/Buildings/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTUHeating.mo
new file mode 100644
index 00000000000..92cd738a20b
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTUHeating.mo
@@ -0,0 +1,296 @@
+within Buildings.Fluid.HeatExchangers.Validation;
+model WetCoilEffectivenessNTUHeating
+ "Model that validates the wet coil effectiveness-NTU model in heating conditions"
+ extends Modelica.Icons.Example;
+
+ package Medium_W = Buildings.Media.Water;
+ package Medium_A = Buildings.Media.Air;
+
+ constant Modelica.SIunits.AbsolutePressure pAtm = 101325
+ "Atmospheric pressure";
+
+ parameter Modelica.SIunits.Temperature T_a1_nominal=50+273.15
+ "Inlet water temperature";
+
+ parameter Modelica.SIunits.Temperature T_b1_nominal=45+273.15
+ "Outlet water temperature";
+
+ parameter Modelica.SIunits.Temperature T_a2_nominal=273.15
+ "Inlet air temperature";
+
+ final parameter Modelica.SIunits.Temperature T_b2_nominal=
+ T_a2_nominal + Q_flow_nominal / m2_flow_nominal / 1010
+ "Outlet air temperature";
+
+ final parameter Modelica.SIunits.ThermalConductance CMin_flow_nominal=
+ min(m1_flow_nominal * 4186, m2_flow_nominal * 1010)
+ "Minimal capacity flow rate at nominal condition";
+
+ final parameter Modelica.SIunits.ThermalConductance CMax_flow_nominal=
+ max(m1_flow_nominal * 4186, m2_flow_nominal * 1010)
+ "Minimal capacity flow rate at nominal condition";
+
+ final parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal=
+ m1_flow_nominal * 4186 * (T_a1_nominal - T_b1_nominal);
+
+ final parameter Real eps_nominal=
+ abs(Q_flow_nominal/((T_a1_nominal - T_a2_nominal) * CMin_flow_nominal))
+ "Nominal effectiveness";
+
+ parameter Modelica.SIunits.ThermalConductance UA_nominal=
+ Buildings.Fluid.HeatExchangers.BaseClasses.ntu_epsilonZ(
+ eps=eps_nominal,
+ Z=CMin_flow_nominal/CMax_flow_nominal,
+ flowRegime=Integer(hexCon)) * CMin_flow_nominal
+ "Total thermal conductance at nominal flow";
+
+ parameter Modelica.SIunits.MassFlowRate m1_flow_nominal = 3.78
+ "Nominal mass flow rate of water";
+ parameter Modelica.SIunits.MassFlowRate m2_flow_nominal = 2.646
+ "Nominal mass flow rate of air";
+ parameter Types.HeatExchangerConfiguration hexCon=
+ Types.HeatExchangerConfiguration.CounterFlow
+ "Heat exchanger configuration";
+ Buildings.Fluid.Sources.Boundary_pT sinAir(
+ redeclare package Medium = Medium_A,
+ use_p_in=false,
+ nPorts=3)
+ "Air sink"
+ annotation (Placement(transformation(extent={{-180,-68},{-160,-48}})));
+ Sources.MassFlowSource_T souAir(
+ redeclare package Medium = Medium_A,
+ m_flow=m2_flow_nominal,
+ use_T_in=true,
+ T=T_a2_nominal,
+ nPorts=1)
+ "Air source"
+ annotation (Placement(transformation(extent={{140,-10},{120,10}})));
+ Buildings.Fluid.Sources.Boundary_pT sinWat(
+ redeclare package Medium = Medium_W,
+ nPorts=3)
+ "Sink for water"
+ annotation (Placement(transformation(extent={{82,30},{62,50}})));
+ Sensors.RelativeHumidityTwoPort relHumIn(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Inlet relative humidity"
+ annotation (Placement(transformation(extent={{40,-10},{20,10}})));
+ Sensors.TemperatureTwoPort TDryBulIn(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Inlet dry bulb temperature"
+ annotation (Placement(transformation(extent={{70,-10},{50,10}})));
+ Sensors.MassFractionTwoPort senMasFraIn(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Water mass fraction of entering air"
+ annotation (Placement(transformation(extent={{110,-10},{90,10}})));
+ Sensors.MassFractionTwoPort senMasFraOut(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Water mass fraction of leaving air"
+ annotation (Placement(transformation(extent={{-110,-10},{-130,10}})));
+ Sensors.TemperatureTwoPort TDryBulOut(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Dry bulb temperature of leaving air"
+ annotation (Placement(transformation(extent={{-50,-10},{-70,10}})));
+ Sources.MassFlowSource_T souWat1(
+ redeclare package Medium = Medium_W,
+ m_flow=m1_flow_nominal,
+ T=T_a1_nominal,
+ nPorts=1)
+ "Source for water"
+ annotation (Placement(transformation(extent={{-180,10},{-160,30}})));
+ DryCoilCounterFlow hexDis(
+ redeclare package Medium1 = Medium_W,
+ redeclare package Medium2 = Medium_A,
+ m1_flow_nominal=m1_flow_nominal,
+ m2_flow_nominal=m2_flow_nominal,
+ dp2_nominal=0,
+ allowFlowReversal1=false,
+ allowFlowReversal2=false,
+ dp1_nominal=0,
+ UA_nominal=UA_nominal,
+ show_T=true,
+ nEle=30,
+ energyDynamics=Modelica.Fluid.Types.Dynamics.FixedInitial,
+ tau1=0.1,
+ tau2=0.1,
+ tau_m=0.1)
+ "Discretized coil model"
+ annotation (Placement(transformation(extent={{-30,56},{-10,76}})));
+ Sources.MassFlowSource_T souWat(
+ redeclare package Medium = Medium_W,
+ m_flow=m1_flow_nominal,
+ T=T_a1_nominal,
+ nPorts=1) "Source for water"
+ annotation (Placement(transformation(extent={{-180,70},{-160,90}})));
+ Sources.MassFlowSource_T souAir2(
+ redeclare package Medium = Medium_A,
+ m_flow=m2_flow_nominal,
+ use_T_in=true,
+ T=T_a2_nominal,
+ nPorts=1)
+ "Air source"
+ annotation (Placement(transformation(extent={{140,50},{120,70}})));
+ Sensors.MassFractionTwoPort senMasFraOut1(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Water mass fraction of leaving air"
+ annotation (Placement(transformation(extent={{-110,50},{-130,70}})));
+ Sensors.TemperatureTwoPort TDryBulOut1(redeclare package Medium = Medium_A,
+ m_flow_nominal=m2_flow_nominal) "Dry bulb temperature of leaving air"
+ annotation (Placement(transformation(extent={{-50,50},{-70,70}})));
+ Sensors.RelativeHumidityTwoPort relHumOut_eps(redeclare package Medium =
+ Medium_A, m_flow_nominal=m2_flow_nominal) "Outlet relative humidity"
+ annotation (Placement(transformation(extent={{-80,-10},{-100,10}})));
+ Sensors.RelativeHumidityTwoPort relHumOut_dis(redeclare package Medium =
+ Medium_A, m_flow_nominal=m2_flow_nominal) "Outlet relative humidity"
+ annotation (Placement(transformation(extent={{-80,50},{-100,70}})));
+ Buildings.Fluid.HeatExchangers.DryCoilEffectivenessNTU hexDryNTU_T(
+ redeclare package Medium1 = Medium_W,
+ redeclare package Medium2 = Medium_A,
+ Q_flow_nominal=Q_flow_nominal,
+ T_a2_nominal=T_a2_nominal,
+ T_a1_nominal=T_a1_nominal,
+ m1_flow_nominal=m1_flow_nominal,
+ m2_flow_nominal=m2_flow_nominal,
+ dp2_nominal=0,
+ dp1_nominal=0,
+ configuration=hexCon,
+ show_T=true)
+ "Effectiveness-NTU coil model (parameterized with nominal T and X)"
+ annotation (Placement(transformation(extent={{-30,-64},{-10,-44}})));
+ Sources.MassFlowSource_T souAir1(
+ redeclare package Medium = Medium_A,
+ m_flow=m2_flow_nominal,
+ use_T_in=true,
+ T=T_a2_nominal,
+ nPorts=1)
+ "Air source"
+ annotation (Placement(transformation(extent={{140,-70},{120,-50}})));
+ Sources.MassFlowSource_T souWat2(
+ redeclare package Medium = Medium_W,
+ m_flow=m1_flow_nominal,
+ T=T_a1_nominal,
+ nPorts=1)
+ "Source for water"
+ annotation (Placement(transformation(extent={{-180,-30},{-160,-10}})));
+ Controls.OBC.CDL.Continuous.Sources.Ramp T_a2(
+ height=15,
+ duration=1000,
+ offset=273.15) "Air inlet temperature"
+ annotation (Placement(transformation(extent={{190,-10},{170,10}})));
+ Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU hexWetNTU_TX(
+ redeclare package Medium1 = Medium_W,
+ redeclare package Medium2 = Medium_A,
+ use_Q_flow_nominal=true,
+ Q_flow_nominal=Q_flow_nominal,
+ T_a2_nominal=T_a2_nominal,
+ w_a2_nominal=0.001,
+ T_a1_nominal=T_a1_nominal,
+ m1_flow_nominal=m1_flow_nominal,
+ m2_flow_nominal=m2_flow_nominal,
+ dp2_nominal=0,
+ dp1_nominal=0,
+ configuration=hexCon,
+ show_T=true)
+ "Effectiveness-NTU coil model (parameterized with nominal T and X)"
+ annotation (Placement(transformation(extent={{-30,10},{-10,30}})));
+equation
+ connect(senMasFraOut.port_b, sinAir.ports[1])
+ annotation (Line(points={{-130,0},{-140,0},{-140,-55.3333},{-160,-55.3333}},
+ color={0,127,255}));
+ connect(souAir.ports[1], senMasFraIn.port_a)
+ annotation (Line(points={{120,0},{110,0}}, color={0,127,255}));
+ connect(senMasFraIn.port_b, TDryBulIn.port_a)
+ annotation (Line(points={{90,0},{70,0}}, color={0,127,255}));
+ connect(TDryBulIn.port_b, relHumIn.port_a)
+ annotation (Line(points={{50,0},{40,0}}, color={0,127,255}));
+ connect(souWat.ports[1], hexDis.port_a1) annotation (Line(points={{-160,80},{-40,
+ 80},{-40,72},{-30,72}}, color={0,127,255}));
+ connect(hexDis.port_b1, sinWat.ports[1]) annotation (Line(points={{-10,72},{
+ 10,72},{10,42.6667},{62,42.6667}}, color={0,127,255}));
+ connect(souAir2.ports[1], hexDis.port_a2) annotation (Line(points={{120,60},{
+ -10,60}}, color={0,127,255}));
+ connect(hexDis.port_b2, TDryBulOut1.port_a)
+ annotation (Line(points={{-30,60},{-50,60}}, color={0,127,255}));
+ connect(senMasFraOut1.port_b, sinAir.ports[2]) annotation (Line(points={{-130,60},
+ {-150,60},{-150,-58},{-160,-58}}, color={0,127,255}));
+ connect(TDryBulOut.port_b, relHumOut_eps.port_a) annotation (Line(points={{
+ -70,0},{-76,0},{-76,0},{-80,0}}, color={0,127,255}));
+ connect(relHumOut_eps.port_b, senMasFraOut.port_a)
+ annotation (Line(points={{-100,0},{-110,0}}, color={0,127,255}));
+ connect(TDryBulOut1.port_b, relHumOut_dis.port_a)
+ annotation (Line(points={{-70,60},{-80,60}}, color={0,127,255}));
+ connect(relHumOut_dis.port_b, senMasFraOut1.port_a)
+ annotation (Line(points={{-100,60},{-110,60}}, color={0,127,255}));
+ connect(hexDryNTU_T.port_b1, sinWat.ports[2]) annotation (Line(points={{-10,-48},
+ {10,-48},{10,40},{62,40}}, color={0,127,255}));
+ connect(souAir1.ports[1], hexDryNTU_T.port_a2)
+ annotation (Line(points={{120,-60},{-10,-60}}, color={0,127,255}));
+ connect(sinAir.ports[3], hexDryNTU_T.port_b2) annotation (Line(points={{-160,
+ -60.6667},{-138,-60.6667},{-138,-60},{-30,-60}},
+ color={0,127,255}));
+ connect(souWat2.ports[1], hexDryNTU_T.port_a1) annotation (Line(points={{-160,
+ -20},{-40,-20},{-40,-48},{-30,-48}}, color={0,127,255}));
+ connect(T_a2.y, souAir2.T_in) annotation (Line(points={{168,0},{160,0},{160,
+ 64},{142,64}}, color={0,0,127}));
+ connect(T_a2.y, souAir.T_in) annotation (Line(points={{168,0},{160,0},{160,4},
+ {142,4}}, color={0,0,127}));
+ connect(T_a2.y, souAir1.T_in) annotation (Line(points={{168,0},{160,0},{160,
+ -56},{142,-56}}, color={0,0,127}));
+ connect(souWat1.ports[1], hexWetNTU_TX.port_a1) annotation (Line(points={{-160,
+ 20},{-96,20},{-96,26},{-30,26}}, color={0,127,255}));
+ connect(hexWetNTU_TX.port_b1, sinWat.ports[3]) annotation (Line(points={{-10,26},
+ {10,26},{10,37.3333},{62,37.3333}}, color={0,127,255}));
+ connect(relHumIn.port_b, hexWetNTU_TX.port_a2) annotation (Line(points={{20,0},{
+ 4,0},{4,14},{-10,14}}, color={0,127,255}));
+ connect(hexWetNTU_TX.port_b2, TDryBulOut.port_a) annotation (Line(points={{-30,
+ 14},{-40,14},{-40,0},{-50,0}}, color={0,127,255}));
+ annotation (Diagram(coordinateSystem(preserveAspectRatio=true,
+ extent={{-200,-120},{200,120}})),
+ experiment(
+ StopTime=1000,
+ Tolerance=1e-06),
+ __Dymola_Commands(
+ file="Resources/Scripts/Dymola/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTUHeating.mos"
+ "Simulate and plot"),
+ Documentation(info="
+
+This model duplicates an example from Mitchell and Braun 2012, example SM-2-1
+(Mitchell and Braun 2012) to validate a single case for the
+
+Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU
+model.
+
+Validation
+
+The example simulates a wet coil with constant air
+and water inlet temperature and mass flow rate, and an increasing air inlet
+humidity which triggers the transition from a fully-dry to a fully-wet regime.
+The reference used for validation is the published experimental data.
+A discretized wet coil model is also simulated for comparison.
+To provide an accurate reference, the latter model is configured with 30 elements.
+Under steady-state modeling assumptions, this creates a large system of
+non-linear equations. To alleviate this effect, dynamics are considered but
+the simulation time is increased to 1000 s to reproduce quasi steady-state
+conditions.
+
+
+Note that the outlet air relative humidity may slightly exceed 100% when using
+the epsilon-NTU model.
+
+References
+
+Mitchell, John W., and James E. Braun. 2012.
+\"Supplementary Material Chapter 2: Heat Exchangers for Cooling Applications\".
+Excerpt from Principles of heating, ventilation, and air conditioning in buildings.
+Hoboken, N.J.: Wiley. Available online:
+
+http://bcs.wiley.com/he-bcs/Books?action=index&itemId=0470624574&bcsId=7185
+
+", revisions="
+
+-
+April 19, 2017, by Michael Wetter:
+Revised model to avoid mixing textual equations and connect statements.
+
+-
+March 17, 2017, by Michael O'Keefe:
+First implementation. See
+
+issue 622 for more information.
+
+
+"));
+end WetCoilEffectivenessNTUHeating;
diff --git a/Buildings/Fluid/HeatExchangers/Validation/package.order b/Buildings/Fluid/HeatExchangers/Validation/package.order
index 9e78f225b19..5f44460ae3a 100644
--- a/Buildings/Fluid/HeatExchangers/Validation/package.order
+++ b/Buildings/Fluid/HeatExchangers/Validation/package.order
@@ -6,3 +6,5 @@ PrescribedOutlet
PrescribedOutlet_dynamic
WetCoilDiscretizedInitialization
WetCoilDiscretizedInitializationPerfectGases
+WetCoilEffectivenessNTU
+WetCoilEffectivenessNTUHeating
diff --git a/Buildings/Fluid/HeatExchangers/WetCoilEffectivenessNTU.mo b/Buildings/Fluid/HeatExchangers/WetCoilEffectivenessNTU.mo
new file mode 100644
index 00000000000..ca9289e7635
--- /dev/null
+++ b/Buildings/Fluid/HeatExchangers/WetCoilEffectivenessNTU.mo
@@ -0,0 +1,631 @@
+within Buildings.Fluid.HeatExchangers;
+model WetCoilEffectivenessNTU
+ "Heat exchanger with effectiveness - NTU relation and with moisture condensation"
+ extends Buildings.Fluid.Interfaces.PartialFourPortInterface(
+ redeclare replaceable package Medium2 = Buildings.Media.Air);
+ extends Buildings.Fluid.Interfaces.FourPortFlowResistanceParameters(
+ final computeFlowResistance1=true,
+ final computeFlowResistance2=true);
+
+ import con = Buildings.Fluid.Types.HeatExchangerConfiguration;
+ import flo = Buildings.Fluid.Types.HeatExchangerFlowRegime;
+
+ parameter Buildings.Fluid.Types.HeatExchangerConfiguration configuration=
+ con.CounterFlow
+ "Heat exchanger configuration";
+ parameter Real r_nominal=2/3
+ "Ratio between air-side and water-side convective heat transfer coefficient";
+
+ parameter Boolean use_Q_flow_nominal = false
+ "Set to true to specify Q_flow_nominal and inlet conditions, or to false to specify UA_nominal"
+ annotation (
+ Evaluate=true,
+ Dialog(group="Nominal thermal performance"));
+
+ parameter Modelica.SIunits.HeatFlowRate Q_flow_nominal(
+ fixed=use_Q_flow_nominal)
+ "Nominal heat flow rate (positive for heat transfer from 1 to 2)"
+ annotation (Dialog(
+ group="Nominal thermal performance",
+ enable=use_Q_flow_nominal));
+ parameter Modelica.SIunits.Temperature T_a1_nominal(
+ fixed=use_Q_flow_nominal)
+ "Water inlet temperature at a rated condition"
+ annotation (Dialog(
+ group="Nominal thermal performance",
+ enable=use_Q_flow_nominal));
+ parameter Modelica.SIunits.Temperature T_a2_nominal(
+ fixed=use_Q_flow_nominal)
+ "Air inlet temperature at a rated condition"
+ annotation (Dialog(
+ group="Nominal thermal performance",
+ enable=use_Q_flow_nominal));
+ parameter Modelica.SIunits.MassFraction w_a2_nominal(
+ start=0.01,
+ fixed=use_Q_flow_nominal)
+ "Humidity ratio of inlet air at a rated condition (in kg/kg dry air)"
+ annotation (Dialog(
+ group="Nominal thermal performance",
+ enable=use_Q_flow_nominal));
+
+ parameter Modelica.SIunits.ThermalConductance UA_nominal(
+ fixed=not use_Q_flow_nominal,
+ min=0,
+ start=1/(1/10+1/20))
+ "Thermal conductance at nominal flow, used to compute heat capacity"
+ annotation(Dialog(
+ group="Nominal thermal performance",
+ enable=not use_Q_flow_nominal));
+
+ // Dynamics
+ parameter Modelica.Fluid.Types.Dynamics energyDynamics=
+ Modelica.Fluid.Types.Dynamics.SteadyState
+ "Type of energy balance: dynamic (3 initialization options) or steady state"
+ annotation(Evaluate=true, Dialog(tab = "Dynamics", group="Equations"));
+ parameter Modelica.Fluid.Types.Dynamics massDynamics=energyDynamics
+ "Type of mass balance: dynamic (3 initialization options) or steady state"
+ annotation(Evaluate=true, Dialog(tab = "Dynamics", group="Equations"));
+
+ Modelica.SIunits.HeatFlowRate Q1_flow = -dryWetCalcs.QTot_flow
+ "Heat input into water stream (positive if air is cooled)";
+ Modelica.SIunits.HeatFlowRate Q2_flow = dryWetCalcs.QTot_flow
+ "Total heat input into air stream (negative if air is cooled)";
+ Modelica.SIunits.HeatFlowRate QSen2_flow = dryWetCalcs.QSen_flow
+ "Sensible heat input into air stream (negative if air is cooled)";
+ Modelica.SIunits.HeatFlowRate QLat2_flow=
+ Buildings.Utilities.Psychrometrics.Constants.h_fg * mWat_flow
+ "Latent heat input into air (negative if air is dehumidified)";
+ Real SHR(
+ min=0,
+ max=1,
+ unit="1") = QSen2_flow /
+ noEvent(if (Q2_flow > 1E-6 or Q2_flow < -1E-6) then Q2_flow else 1)
+ "Sensible to total heat ratio";
+ Modelica.SIunits.MassFlowRate mWat_flow = dryWetCalcs.mCon_flow
+ "Water flow rate of condensate removed from the air stream";
+
+ Real dryFra(final unit="1", min=0, max=1) = dryWetCalcs.dryFra
+ "Dry fraction, 0.3 means condensation occurs at 30% heat exchange length from air inlet";
+protected
+ final parameter Modelica.SIunits.MassFraction X_w_a2_nominal=
+ w_a2_nominal / (1+w_a2_nominal)
+ "Water mass fraction of inlet air at a rated condition (in kg/kg total air)";
+
+ parameter Boolean waterSideFlowDependent=true
+ "Set to false to make water-side hA independent of mass flow rate"
+ annotation (Dialog(tab="Heat transfer"));
+ parameter Boolean airSideFlowDependent=true
+ "Set to false to make air-side hA independent of mass flow rate"
+ annotation (Dialog(tab="Heat transfer"));
+ parameter Boolean waterSideTemperatureDependent=false
+ "Set to false to make water-side hA independent of temperature"
+ annotation (Dialog(tab="Heat transfer"));
+ parameter Boolean airSideTemperatureDependent=false
+ "Set to false to make air-side hA independent of temperature"
+ annotation (Dialog(tab="Heat transfer"));
+
+ Real delta=1E-2
+ "Parameter for normalization";
+ Real delta1=1E-1
+ "Parameter for normalization";
+ Real fac1 = Buildings.Utilities.Math.Functions.smoothMin(
+ (1/delta * m1_flow/m1_flow_nominal)^2,1,delta1);
+ Real fac2 = Buildings.Utilities.Math.Functions.smoothMin(
+ (1/delta * m2_flow/m2_flow_nominal)^2,1,delta1);
+ Real Qfac = fac1*fac2;
+
+ Buildings.Fluid.HeatExchangers.BaseClasses.WetCoilUARated UAFroRated(
+ final use_Q_flow_nominal=use_Q_flow_nominal,
+ final QTot_flow=Q_flow_nominal,
+ final UA=UA_nominal,
+ final r_nominal=r_nominal,
+ final TAirIn=T_a2_nominal,
+ final X_wAirIn=X_w_a2_nominal,
+ final TWatIn=T_a1_nominal,
+ final mAir_flow=m2_flow_nominal,
+ final mWat_flow=m1_flow_nominal)
+ "Model that computes UA_nominal";
+
+ Buildings.Fluid.HeatExchangers.HeaterCooler_u heaCoo(
+ redeclare final package Medium = Medium1,
+ final dp_nominal = dp1_nominal,
+ final m_flow_nominal = m1_flow_nominal,
+ final energyDynamics = energyDynamics,
+ final massDynamics = massDynamics,
+ final Q_flow_nominal=-1)
+ "Heat exchange with water stream"
+ annotation (Placement(transformation(extent={{60,50},{80,70}})));
+
+ Buildings.Fluid.Humidifiers.Humidifier_u heaCooHum_u(
+ redeclare final package Medium = Medium2,
+ mWat_flow_nominal = 1,
+ dp_nominal = dp2_nominal,
+ m_flow_nominal = m2_flow_nominal,
+ energyDynamics = energyDynamics,
+ massDynamics = massDynamics)
+ "Heat and moisture exchange with air stream"
+ annotation (Placement(transformation(extent={{-60,-70},{-80,-50}})));
+ Buildings.Fluid.HeatExchangers.BaseClasses.HADryCoil hA(
+ final UA_nominal = UA_nominal,
+ final m_flow_nominal_a = m2_flow_nominal,
+ final m_flow_nominal_w = m1_flow_nominal,
+ final waterSideTemperatureDependent = waterSideTemperatureDependent,
+ final waterSideFlowDependent = waterSideFlowDependent,
+ final airSideTemperatureDependent = airSideTemperatureDependent,
+ final airSideFlowDependent = airSideFlowDependent,
+ r_nominal = r_nominal)
+ "Model for convective heat transfer coefficient"
+ annotation (Placement(transformation(extent={{-68,-13},{-50,9}})));
+ Buildings.Fluid.HeatExchangers.BaseClasses.WetCoilDryWetRegime dryWetCalcs(
+ final cfg=flowRegime,
+ final mWat_flow_nominal=m1_flow_nominal,
+ final mAir_flow_nominal=m2_flow_nominal,
+ Qfac=Qfac)
+ "Dry/wet calculations block"
+ annotation (Placement(transformation(extent={{-20,-40},{60,40}})));
+ Modelica.Blocks.Sources.RealExpression cp_a1Exp(final y=
+ Medium1.specificHeatCapacityCp(state_a1_inflow))
+ "Expression for cp of air"
+ annotation (Placement(transformation(extent={{-44,18},{-30,30}})));
+ Modelica.Blocks.Sources.RealExpression XWat_a2Exp(
+ final y = if allowFlowReversal2
+ then
+ fra_a2 * state_a2_inflow.X[nWat] + fra_b2 * state_b2_inflow.X[nWat]
+ else
+ state_a2_inflow.X[nWat])
+ "Expression for XWat"
+ annotation (Placement(transformation(extent={{-44,-2},{-30,10}})));
+ Modelica.Blocks.Sources.RealExpression p_a2Exp(
+ final y = port_a2.p)
+ "Pressure at port a2"
+ annotation (Placement(transformation(extent={{-44,-10},{-30,2}})));
+ Modelica.Blocks.Sources.RealExpression h_a2Exp(
+ final y = if allowFlowReversal2
+ then
+ fra_a2 * Medium2.specificEnthalpy(state_a2_inflow)
+ + fra_b2 * Medium2.specificEnthalpy(state_b2_inflow)
+ else
+ Medium2.specificEnthalpy(state_a2_inflow))
+ "Specific enthalpy at port a2"
+ annotation (Placement(transformation(extent={{-44,-18},{-30,-6}})));
+ Modelica.Blocks.Sources.RealExpression cp_a2Exp(final y=
+ Medium2.specificHeatCapacityCp(state_a2_inflow))
+ "Specific heat capacity at port a2"
+ annotation (Placement(transformation(extent={{-44,-30},{-30,-18}})));
+ Modelica.Blocks.Sources.RealExpression TIn_a1Exp(
+ final y = if allowFlowReversal1
+ then
+ fra_a1 * Medium1.temperature(state_a1_inflow)
+ + fra_b1 * Medium1.temperature(state_b1_inflow)
+ else
+ Medium1.temperature(state_a1_inflow))
+ "Temperature at port a1"
+ annotation (Placement(transformation(extent={{-98,16},{-84,28}})));
+ Modelica.Blocks.Sources.RealExpression TIn_a2Exp(
+ final y = if allowFlowReversal2
+ then
+ fra_a2 * Medium2.temperature(state_a2_inflow)
+ + fra_b2 * Medium2.temperature(state_b2_inflow)
+ else
+ Medium2.temperature(state_a2_inflow))
+ "Temperature at port a2"
+ annotation (Placement(transformation(extent={{-98,-8},{-84,4}})));
+ Modelica.Blocks.Sources.RealExpression m_flow_a1Exp(
+ final y=Buildings.Utilities.Math.Functions.regNonZeroPower(
+ x=port_a1.m_flow,n=1,delta=delta*m1_flow_nominal))
+ "Absolute value of mass flow rate on water side"
+ annotation (Placement(transformation(extent={{-98,30},{-84,42}})));
+ Modelica.Blocks.Sources.RealExpression m_flow_a2Exp(
+ final y=Buildings.Utilities.Math.Functions.regNonZeroPower(
+ x=port_a2.m_flow,n=1,delta=delta*m2_flow_nominal))
+ "Absolute value of mass flow rate on air side"
+ annotation (Placement(transformation(extent={{-98,-36},{-84,-24}})));
+ final parameter Integer nWat=
+ Buildings.Fluid.HeatExchangers.BaseClasses.determineWaterIndex(
+ Medium2.substanceNames)
+ "Index of water";
+ parameter flo flowRegime_nominal(fixed=false)
+ "Heat exchanger flow regime at nominal flow rates";
+ flo flowRegime(fixed=false, start=flowRegime_nominal)
+ "Heat exchanger flow regime";
+
+ Buildings.HeatTransfer.Sources.PrescribedHeatFlow preHea
+ "Prescribed heat flow"
+ annotation (Placement(transformation(extent={{20,-90},{0,-70}})));
+ Real fra_a1(min=0, max=1) = if allowFlowReversal1
+ then Modelica.Fluid.Utilities.regStep(
+ m1_flow,
+ 1,
+ 0,
+ m1_flow_small)
+ else 1
+ "Fraction of incoming state taken from port a2
+ (used to avoid excessive calls to regStep)";
+ Real fra_b1(min=0, max=1) = if allowFlowReversal1
+ then 1-fra_a1
+ else 0
+ "Fraction of incoming state taken from port b2
+ (used to avoid excessive calls to regStep)";
+ Real fra_a2(min=0, max=1) = if allowFlowReversal2
+ then Modelica.Fluid.Utilities.regStep(
+ m2_flow,
+ 1,
+ 0,
+ m2_flow_small)
+ else 1
+ "Fraction of incoming state taken from port a2
+ (used to avoid excessive calls to regStep)";
+ Real fra_b2(min=0, max=1) = if allowFlowReversal2
+ then 1-fra_a2
+ else 0
+ "Fraction of incoming state taken from port b2
+ (used to avoid excessive calls to regStep)";
+
+ Modelica.SIunits.ThermalConductance C1_flow = abs(m1_flow)*
+ ( if allowFlowReversal1 then
+ fra_a1 * Medium1.specificHeatCapacityCp(state_a1_inflow) +
+ fra_b1 * Medium1.specificHeatCapacityCp(state_b1_inflow) else
+ Medium1.specificHeatCapacityCp(state_a1_inflow))
+ "Heat capacity flow rate medium 1";
+ Modelica.SIunits.ThermalConductance C2_flow = abs(m2_flow)*
+ ( if allowFlowReversal2 then
+ fra_a2 * Medium2.specificHeatCapacityCp(state_a2_inflow) +
+ fra_b2 * Medium2.specificHeatCapacityCp(state_b2_inflow) else
+ Medium2.specificHeatCapacityCp(state_a2_inflow))
+ "Heat capacity flow rate medium 2";
+ parameter Modelica.SIunits.SpecificHeatCapacity cp1_nominal(fixed=false)
+ "Specific heat capacity of medium 1 at nominal condition";
+ parameter Modelica.SIunits.SpecificHeatCapacity cp2_nominal(fixed=false)
+ "Specific heat capacity of medium 2 at nominal condition";
+ parameter Modelica.SIunits.ThermalConductance C1_flow_nominal(fixed=false)
+ "Nominal capacity flow rate of Medium 1";
+ parameter Modelica.SIunits.ThermalConductance C2_flow_nominal(fixed=false)
+ "Nominal capacity flow rate of Medium 2";
+ final parameter Medium1.ThermodynamicState sta1_default = Medium1.setState_phX(
+ h=Medium1.h_default,
+ p=Medium1.p_default,
+ X=Medium1.X_default[1:Medium1.nXi]) "Default state for medium 1";
+ final parameter Medium2.ThermodynamicState sta2_default = Medium2.setState_phX(
+ h=Medium2.h_default,
+ p=Medium2.p_default,
+ X=Medium2.X_default[1:Medium2.nXi]) "Default state for medium 2";
+
+initial equation
+ cp1_nominal = Medium1.specificHeatCapacityCp(sta1_default);
+ cp2_nominal = Medium2.specificHeatCapacityCp(sta2_default);
+ C1_flow_nominal = m1_flow_nominal*cp1_nominal;
+ C2_flow_nominal = m2_flow_nominal*cp2_nominal;
+ if (configuration == con.CrossFlowStream1MixedStream2Unmixed) then
+ flowRegime_nominal = if (C1_flow_nominal < C2_flow_nominal)
+ then
+ flo.CrossFlowCMinMixedCMaxUnmixed
+ else
+ flo.CrossFlowCMinUnmixedCMaxMixed;
+ elseif (configuration == con.CrossFlowStream1UnmixedStream2Mixed) then
+ flowRegime_nominal = if (C1_flow_nominal < C2_flow_nominal)
+ then
+ flo.CrossFlowCMinUnmixedCMaxMixed
+ else
+ flo.CrossFlowCMinMixedCMaxUnmixed;
+ elseif (configuration == con.ParallelFlow) then
+ flowRegime_nominal = flo.ParallelFlow;
+ elseif (configuration == con.CounterFlow) then
+ flowRegime_nominal = flo.CounterFlow;
+ elseif (configuration == con.CrossFlowUnmixed) then
+ flowRegime_nominal = flo.CrossFlowUnmixed;
+ else
+ // Invalid flow regime. Assign a value to flowRegime_nominal, and stop with an assert
+ flowRegime_nominal = flo.CrossFlowUnmixed;
+ assert(configuration >= con.ParallelFlow and
+ configuration <= con.CrossFlowStream1UnmixedStream2Mixed,
+ "Invalid heat exchanger configuration.");
+ end if;
+equation
+ // Assign the flow regime for the given heat exchanger configuration and
+ // mass flow rates
+ if (configuration == con.ParallelFlow) then
+ flowRegime = if (C1_flow*C2_flow >= 0)
+ then
+ flo.ParallelFlow
+ else
+ flo.CounterFlow;
+ elseif (configuration == con.CounterFlow) then
+ flowRegime = if (C1_flow*C2_flow >= 0)
+ then
+ flo.CounterFlow
+ else
+ flo.ParallelFlow;
+ elseif (configuration == con.CrossFlowUnmixed) then
+ flowRegime = flo.CrossFlowUnmixed;
+ elseif (configuration == con.CrossFlowStream1MixedStream2Unmixed) then
+ flowRegime = if (C1_flow < C2_flow)
+ then
+ flo.CrossFlowCMinMixedCMaxUnmixed
+ else
+ flo.CrossFlowCMinUnmixedCMaxMixed;
+ else
+ // have ( configuration == con.CrossFlowStream1UnmixedStream2Mixed)
+ flowRegime = if (C1_flow < C2_flow)
+ then
+ flo.CrossFlowCMinUnmixedCMaxMixed
+ else
+ flo.CrossFlowCMinMixedCMaxUnmixed;
+ end if;
+
+ connect(heaCoo.port_b, port_b1) annotation (Line(points={{80,60},{80,60},{100,60}},color={0,127,255},
+ thickness=1));
+ connect(heaCooHum_u.port_b, port_b2) annotation (Line(
+ points={{-80,-60},{-90,-60},{-100,-60}},
+ color={0,127,255},
+ thickness=1));
+ connect(hA.hA_1, dryWetCalcs.UAWat) annotation (Line(points={{-49.1,5.7},{-46,
+ 5.7},{-46,36.6667},{-22.8571,36.6667}}, color={0,0,127}));
+ connect(hA.hA_2, dryWetCalcs.UAAir) annotation (Line(points={{-49.1,-9.7},{
+ -46,-9.7},{-46,-36},{-46,-36.6667},{-22.8571,-36.6667}},
+ color={0,0,127}));
+ connect(cp_a1Exp.y, dryWetCalcs.cpWat) annotation (Line(points={{-29.3,24},{
+ -22.8571,24},{-22.8571,23.3333}},
+ color={0,0,127}));
+ connect(XWat_a2Exp.y, dryWetCalcs.X_wAirIn) annotation (Line(points={{-29.3,4},
+ {-22.8571,4},{-22.8571,3.33333}}, color={0,0,127}));
+ connect(p_a2Exp.y, dryWetCalcs.pAir) annotation (Line(points={{-29.3,-4},{
+ -22.8571,-4},{-22.8571,-3.33333}},
+ color={0,0,127}));
+ connect(h_a2Exp.y, dryWetCalcs.hAirIn) annotation (Line(points={{-29.3,-12},{
+ -22,-12},{-22,-10},{-22.8571,-10}},
+ color={0,0,127}));
+ connect(cp_a2Exp.y, dryWetCalcs.cpAir) annotation (Line(points={{-29.3,-24},{
+ -22.8571,-24},{-22.8571,-23.3333}},
+ color={0,0,127}));
+ connect(TIn_a1Exp.y, hA.T_1) annotation (Line(points={{-83.3,22},{-80,22},{-80,
+ 1.3},{-68.9,1.3}}, color={0,0,127}));
+ connect(TIn_a1Exp.y, dryWetCalcs.TWatIn) annotation (Line(points={{-83.3,22},
+ {-50,22},{-50,16.6667},{-22.8571,16.6667}}, color={0,0,127}));
+ connect(TIn_a2Exp.y, hA.T_2) annotation (Line(points={{-83.3,-2},{-76,-2},{-76,
+ -5.3},{-68.9,-5.3}}, color={0,0,127}));
+ connect(TIn_a2Exp.y, dryWetCalcs.TAirIn) annotation (Line(points={{-83.3,-2},
+ {-76,-2},{-76,-16.6667},{-22.8571,-16.6667}}, color={0,0,127}));
+ connect(m_flow_a1Exp.y, hA.m1_flow) annotation (Line(points={{-83.3,36},{-76,36},
+ {-76,5.7},{-68.9,5.7}}, color={0,0,127}));
+ connect(m_flow_a1Exp.y, dryWetCalcs.mWat_flow) annotation (Line(points={{-83.3,
+ 36},{-50,36},{-50,30},{-22.8571,30}}, color={0,0,127}));
+ connect(port_a1, heaCoo.port_a) annotation (Line(
+ points={{-100,60},{-20,60},{60,60}},
+ color={0,127,255},
+ thickness=1));
+ connect(m_flow_a2Exp.y, hA.m2_flow) annotation (Line(points={{-83.3,-30},{-80,
+ -30},{-80,-9.7},{-68.9,-9.7}},
+ color={0,0,127}));
+ connect(m_flow_a2Exp.y, dryWetCalcs.mAir_flow) annotation (Line(points={{-83.3,
+ -30},{-22.8571,-30}}, color={0,0,127}));
+ connect(port_a2, heaCooHum_u.port_a) annotation (Line(
+ points={{100,-60},{20,-60},{-60,-60}},
+ color={0,127,255},
+ thickness=1));
+ connect(preHea.port, heaCooHum_u.heatPort) annotation (Line(points={{0,-80},{-40,
+ -80},{-40,-66},{-60,-66}}, color={191,0,0}));
+ connect(dryWetCalcs.QTot_flow, heaCoo.u) annotation (Line(points={{62.8571,
+ -6.66667},{80,-6.66667},{80,44},{40,44},{40,66},{58,66}},
+ color={0,0,127}));
+ connect(dryWetCalcs.mCon_flow, heaCooHum_u.u) annotation (Line(points={{62.8571,
+ -33.3333},{70,-33.3333},{70,-54},{-59,-54}}, color={0,0,127}));
+ connect(preHea.Q_flow, dryWetCalcs.QTot_flow) annotation (Line(points={{20,-80},
+ {44,-80},{80,-80},{80,-6.66667},{62.8571,-6.66667}},
+ color={0,0,127}));
+ annotation (
+ defaultComponentName="hexWetNtu",
+ Icon(graphics={
+ Rectangle(
+ extent={{-70,80},{70,-80}},
+ lineColor={0,0,255},
+ pattern=LinePattern.None,
+ fillColor={95,95,95},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{36,80},{40,-80}},
+ lineColor={0,0,255},
+ pattern=LinePattern.None,
+ fillColor={0,0,0},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{-40,80},{-36,-80}},
+ lineColor={0,0,255},
+ pattern=LinePattern.None,
+ fillColor={0,0,0},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{-2,80},{2,-80}},
+ lineColor={0,0,255},
+ pattern=LinePattern.None,
+ fillColor={0,0,0},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{-100,-55},{101,-65}},
+ lineColor={0,0,255},
+ pattern=LinePattern.None,
+ fillColor={0,127,0},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{-98,65},{103,55}},
+ lineColor={0,0,255},
+ pattern=LinePattern.None,
+ fillColor={0,0,255},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{-70,80},{70,-80}},
+ lineColor={0,0,255},
+ pattern=LinePattern.None,
+ fillColor={95,95,95},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{-100,-55},{101,-65}},
+ lineColor={0,0,255},
+ pattern=LinePattern.None,
+ fillColor={0,127,0},
+ fillPattern=FillPattern.Solid),
+ Rectangle(
+ extent={{-98,65},{103,55}},
+ lineColor={0,0,255},
+ pattern=LinePattern.None,
+ fillColor={0,0,255},
+ fillPattern=FillPattern.Solid),
+ Polygon(
+ points={{46,-62},{44,-72},{50,-76},{58,-72},{56,-62},{50,-50},{46,-62}},
+ lineColor={0,0,255},
+ fillColor={0,0,255},
+ fillPattern=FillPattern.Solid,
+ smooth=Smooth.Bezier),
+ Polygon(
+ points={{24,-52},{22,-62},{28,-66},{36,-62},{34,-52},{28,-40},{24,-52}},
+ lineColor={0,0,255},
+ fillColor={0,0,255},
+ fillPattern=FillPattern.Solid,
+ smooth=Smooth.Bezier),
+ Polygon(
+ points={{0,-48},{-2,-58},{4,-62},{12,-58},{10,-48},{4,-36},{0,-48}},
+ lineColor={0,0,255},
+ fillColor={0,0,255},
+ fillPattern=FillPattern.Solid,
+ smooth=Smooth.Bezier),
+ Polygon(
+ points={{-18,-64},{-20,-74},{-14,-78},{-6,-74},{-8,-64},{-14,-52},{
+ -18,-64}},
+ lineColor={0,0,255},
+ fillColor={0,0,255},
+ fillPattern=FillPattern.Solid,
+ smooth=Smooth.Bezier),
+ Polygon(
+ points={{-40,-50},{-42,-60},{-36,-64},{-28,-60},{-30,-50},{-36,-38},{
+ -40,-50}},
+ lineColor={0,0,255},
+ fillColor={0,0,255},
+ fillPattern=FillPattern.Solid,
+ smooth=Smooth.Bezier),
+ Polygon(
+ points={{-58,-62},{-60,-72},{-54,-76},{-46,-72},{-48,-62},{-54,-50},{
+ -58,-62}},
+ lineColor={0,0,255},
+ fillColor={0,0,255},
+ fillPattern=FillPattern.Solid,
+ smooth=Smooth.Bezier)}),
+ Diagram(graphics={Text(
+ extent={{44,84},{86,76}},
+ lineColor={28,108,200},
+ textString="Water Side",
+ textStyle={TextStyle.Italic},
+ horizontalAlignment=TextAlignment.Left),
+ Text(
+ extent={{-42,-80},{0,-88}},
+ lineColor={28,108,200},
+ textStyle={TextStyle.Italic},
+ horizontalAlignment=TextAlignment.Left,
+ textString="Air Side")}),
+ Documentation(info="
+
+This model describes a cooling coil applicable for fully-dry,
+partially-wet, and fully-wet regimes.
+The model is developed for counter flow heat exchangers but is also applicable
+for the cross-flow configuration, although in the latter case it is recommended
+to have more than four tube rows (Elmahdy and Mitalas, 1977 and Braun, 1988).
+The model can also be used for a heat exchanger which acts as both heating coil
+(for some period of time) and cooling coil (for the others).
+However, it is not recommended to use this model for heating coil only or for
+cooling coil with no water condensation because for these situations,
+
+Buildings.Fluid.HeatExchangers.DryCoilEffectivenessNTU
+computes faster.
+
+Main equations
+
+The coil model consists of two-equation sets, one for the fully-dry mode and
+the other for the fully-wet mode. For the fully-dry mode, the ε-NTU
+approach (Elmahdy and Mitalas, 1977) is used.
+For the fully-wet mode, equations from Braun (1988) and Mitchell and Braun (2012a and b),
+which are essentially the extension of the ε-NTU approach to simultaneous sensible
+and latent heat transfer, are utilized.
+The equation sets are switched depending on the switching criteria described below
+that determines the right mode based on a coil surface temperature and dew-point
+temperature for the air at the inlet of the coil.
+The transition regime between the two modes, which represents the partially-wet and
+partially-dry coil, is approximated by employing a fuzzy modeling approach,
+so-called Takagi-Sugeno fuzzy modeling (Takagi and Sugeno, 1985), which provides a
+continuously differentiable model that can cover all fully-dry, partially-wet,
+and fully-wet regimes.
+
+The switching rules are:
+
+- R1: If the coil surface temperature at the air inlet is lower than the
+dew-point temperature of air at inlet, then the cooling coil surface is fully-wet.
+
+-
+R2: If the coil surface temperature at the air outlet is higher than the
+dew-point temperature of air at inlet, then the cooling coil surface is fully-dry.
+
+-
+R3: If any of the conditions in R1 or R2 is not satisfied, then the cooling coil
+surface is partially wet.
+
+
+
+For more detailed descriptions of the fully-wet coil model and the fuzzy modeling approach,
+see
+
+Buildings.Fluid.HeatExchangers.BaseClasses.WetCoilWetRegime.
+and
+
+Buildings.Fluid.HeatExchangers.BaseClasses.WetCoilDryWetRegime.
+
+Assumptions and limitations
+This model contains the following assumptions and limitations:
+Medium 2 must be air due to the use of various psychrometric functions.
+
+When parameterizing this model with rated conditions (with the parameter
+use_UA_nominal set to false), those should
+correspond to a fully-dry or a fully-wet coil regime, because
+the model uncertainty yielded by partially-wet rated conditions
+has not been assessed yet.
+
+The model uses steady-state physics. That is, no dynamics associated
+with water and coil materials are considered.
+The Lewis number, which relates the mass transfer coefficient to the heat transfer
+coefficient, is assumed to be 1.
+The model is not suitable for a cross-flow heat exchanger of which the number
+of passes is less than four.
+Validation
+Validation results can be found in
+
+Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTU.
+
References
+Braun, James E. 1988.
+"Methodologies for the Design and Control of
+Central Cooling Plants".
+PhD Thesis. University of Wisconsin - Madison.
+Available
+
+online.
+
+Mitchell, John W., and James E. Braun. 2012a.
+Principles of heating, ventilation, and air conditioning in buildings.
+Hoboken, N.J.: Wiley.
+Mitchell, John W., and James E. Braun. 2012b.
+"Supplementary Material Chapter 2: Heat Exchangers for Cooling Applications".
+Excerpt from Principles of heating, ventilation, and air conditioning in buildings.
+Hoboken, N.J.: Wiley.
+Available
+
+online.
+
+Elmahdy, A.H. and Mitalas, G.P. 1977.
+"A Simple Model for Cooling and Dehumidifying Coils for Use
+In Calculating Energy Requirements for Buildings".
+ASHRAE Transactions. Vol.83. Part 2. pp. 103-117.
+Takagi, T. and Sugeno, M., 1985.
+Fuzzy identification of systems and its applications to modeling and control.
+ IEEE transactions on systems, man, and cybernetics, (1), pp.116-132.
+", revisions="
+
+- Jan 21, 2021, by Donghun Kim:
First implementation of the fuzzy model.
+See issue 622 for more information.
+
+"));
+end WetCoilEffectivenessNTU;
diff --git a/Buildings/Fluid/HeatExchangers/package.order b/Buildings/Fluid/HeatExchangers/package.order
index 7b44a9110bc..6ecb01ef70a 100644
--- a/Buildings/Fluid/HeatExchangers/package.order
+++ b/Buildings/Fluid/HeatExchangers/package.order
@@ -10,6 +10,7 @@ PrescribedOutlet
SensibleCooler_T
WetCoilCounterFlow
WetCoilDiscretized
+WetCoilEffectivenessNTU
ActiveBeams
CoolingTowers
DXCoils
diff --git a/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System2Temperatures.png b/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System2Temperatures.png
index f79fb609fbb..28f62ac4d9d 100755
Binary files a/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System2Temperatures.png and b/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System2Temperatures.png differ
diff --git a/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System3FlowRateClosedLoop.png b/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System3FlowRateClosedLoop.png
index 7919e98ee6d..5eee7fa390d 100644
Binary files a/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System3FlowRateClosedLoop.png and b/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System3FlowRateClosedLoop.png differ
diff --git a/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System3TemperaturesClosedLoop.png b/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System3TemperaturesClosedLoop.png
index bed0b17a89b..622a93a6d7b 100644
Binary files a/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System3TemperaturesClosedLoop.png and b/Buildings/Resources/Images/Examples/Tutorial/SpaceCooling/System3TemperaturesClosedLoop.png differ
diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Examples_Tutorial_SpaceCooling_System2.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Examples_Tutorial_SpaceCooling_System2.txt
index b0021a6b470..a333fce0ee7 100644
--- a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Examples_Tutorial_SpaceCooling_System2.txt
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Examples_Tutorial_SpaceCooling_System2.txt
@@ -1,18 +1,18 @@
-last-generated=2019-08-16
+last-generated=2021-03-10
statistics-initialization=
{
- "nonlinear": "0, 0",
+ "nonlinear": "0, 1, 0, 0, 0",
"numerical Jacobians": "0"
}
statistics-simulation=
{
- "linear": "0, 0",
- "nonlinear": "1, 0, 0, 0",
- "number of continuous time states": "24",
+ "linear": "0",
+ "nonlinear": "1, 0, 0, 0, 1, 1",
+ "number of continuous time states": "12",
"numerical Jacobians": "0"
}
-TOut.T=[3.031499938964844e+02, 3.031499938964844e+02]
-vol.T_start=[2.931499938964844e+02, 2.931499938964844e+02]
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time=[0e+00, 1.08e+04]
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+TOut.T=[3.031499938964844e+02, 3.031499938964844e+02]
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diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Examples_Tutorial_SpaceCooling_System3.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Examples_Tutorial_SpaceCooling_System3.txt
index b34de20b211..13d025e3ba2 100644
--- a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Examples_Tutorial_SpaceCooling_System3.txt
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Examples_Tutorial_SpaceCooling_System3.txt
@@ -1,20 +1,20 @@
-last-generated=2019-12-20
+last-generated=2021-03-10
statistics-initialization=
{
"linear": "0, 0",
- "nonlinear": "0, 0, 0",
+ "nonlinear": "0, 1, 0, 0, 0",
"numerical Jacobians": "0"
}
statistics-simulation=
{
- "linear": "0, 0",
- "nonlinear": "1, 0, 0, 0",
- "number of continuous time states": "24",
+ "linear": "0",
+ "nonlinear": "1, 0, 0, 0, 1, 1",
+ "number of continuous time states": "12",
"numerical Jacobians": "0"
}
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diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_FMI_ExportContainers_Validation_RoomHVAC.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_FMI_ExportContainers_Validation_RoomHVAC.txt
index 57e7fa1a313..e8954345383 100644
--- a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_FMI_ExportContainers_Validation_RoomHVAC.txt
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_FMI_ExportContainers_Validation_RoomHVAC.txt
@@ -1,23 +1,23 @@
-last-generated=2019-08-15
+last-generated=2021-04-16
statistics-initialization=
{
"linear": "0, 0",
- "nonlinear": "0, 0, 1, 0, 0",
+ "nonlinear": "0, 1, 1, 0, 0, 0, 0, 0",
"numerical Jacobians": "0"
}
statistics-simulation=
{
- "linear": "0, 0, 0, 0, 0, 0, 0, 0, 0",
- "nonlinear": "0, 0, 1, 0, 0, 0, 1",
- "number of continuous time states": "77",
+ "linear": "0, 0, 0, 0, 0, 0, 0, 0",
+ "nonlinear": "0, 0, 1, 0, 1, 1, 0, 0, 1",
+ "number of continuous time states": "65",
"numerical Jacobians": "0"
}
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time=[1.5552e+07, 1.56384e+07]
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diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_Examples_WetCoilEffectivenessNTUMassFlow.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_Examples_WetCoilEffectivenessNTUMassFlow.txt
new file mode 100644
index 00000000000..e6779cf2c53
--- /dev/null
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_Examples_WetCoilEffectivenessNTUMassFlow.txt
@@ -0,0 +1,18 @@
+last-generated=2021-02-22
+statistics-initialization=
+{
+ "nonlinear": "0, 1",
+ "numerical Jacobians": "0"
+}
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+ "linear": " ",
+ "nonlinear": "1, 1",
+ "number of continuous time states": "2",
+ "numerical Jacobians": "0"
+}
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diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_Validation_WetCoilEffectivenessNTU.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_Validation_WetCoilEffectivenessNTU.txt
new file mode 100644
index 00000000000..ee8eb660269
--- /dev/null
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_Validation_WetCoilEffectivenessNTU.txt
@@ -0,0 +1,28 @@
+last-generated=2021-04-06
+statistics-initialization=
+{
+ "nonlinear": "0, 1, 1",
+ "numerical Jacobians": "0"
+}
+statistics-simulation=
+{
+ "linear": " ",
+ "nonlinear": "1, 1, 1, 1, 1, 1",
+ "number of continuous time states": "131",
+ "numerical Jacobians": "0"
+}
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+hexWetNTU.UA_nominal=[4.748e+03, 4.748e+03]
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diff --git a/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_Validation_WetCoilEffectivenessNTUHeating.txt b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_Validation_WetCoilEffectivenessNTUHeating.txt
new file mode 100644
index 00000000000..99fc61dfa0f
--- /dev/null
+++ b/Buildings/Resources/ReferenceResults/Dymola/Buildings_Fluid_HeatExchangers_Validation_WetCoilEffectivenessNTUHeating.txt
@@ -0,0 +1,23 @@
+last-generated=2021-04-14
+statistics-initialization=
+{
+ "nonlinear": "1, 1",
+ "numerical Jacobians": "0"
+}
+statistics-simulation=
+{
+ "linear": " ",
+ "nonlinear": "1",
+ "number of continuous time states": "130",
+ "numerical Jacobians": "0"
+}
+time=[0e+00, 1e+03]
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+hexDis.UA_nominal=[2.5445390625e+03, 2.5445390625e+03]
+hexWetNTU_TX.UA_nominal=[2.54964794921875e+03, 2.54964794921875e+03]
+hexDryNTU_T.UA_nominal=[2.537459228515625e+03, 2.537459228515625e+03]
diff --git a/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Examples/WetCoilEffectivenessNTUMassFlow.mos b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Examples/WetCoilEffectivenessNTUMassFlow.mos
new file mode 100644
index 00000000000..8604ee61fc6
--- /dev/null
+++ b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Examples/WetCoilEffectivenessNTUMassFlow.mos
@@ -0,0 +1,15 @@
+simulateModel("Buildings.Fluid.HeatExchangers.Examples.WetCoilEffectivenessNTUMassFlow",
+ stopTime=3600,
+ method="cvode",
+ tolerance=1e-6,
+ resultFile="WetCoilEffectivenessNTUMassFlow");
+createPlot(
+ id=1,
+ position={0, 0, 782, 636},
+ y={"hex.Q2_flow", "hex.QLat2_flow"},
+ grid=true);
+createPlot(
+ id=1,
+ y={"hex.port_a1.m_flow", "hex.port_a2.m_flow"},
+ grid=true,
+ subPlot=2);
diff --git a/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTU.mos b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTU.mos
new file mode 100644
index 00000000000..f6feb385a99
--- /dev/null
+++ b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTU.mos
@@ -0,0 +1,62 @@
+simulateModel("Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTU",
+ stopTime=1000,
+ method="cvode",
+ tolerance=1e-6,
+ resultFile="WetCoilEffectivenessNTU");
+createPlot(
+ id=1,
+ position={59, 59, 1186, 1286},
+ y={"hexDis.Q1_flow", "hexWetNTU.Q1_flow", "hexWetNTU_TX.Q1_flow"},
+ range = {0, 1000, 1E4, 1E5},
+ autoscale=false,
+ autoerase=true,
+ autoreplot=true,
+ grid=true,
+ color=true);
+createPlot(
+ id=1,
+ y={"hexDis.sta_b2.T", "hexWetNTU.sta_b2.T", "hexWetNTU_TX.sta_b2.T"},
+ range={0.0, 1000.0, 8.0, 16.0},
+ autoscale=false,
+ autoerase=true,
+ autoreplot=true,
+ grid=true,
+ color=true,
+ subPlot=102);
+createPlot(
+ id=1,
+ subPlot=3,
+ y={"relHumOut_dis.phi", "relHumOut_eps.phi"},
+ range={0.0, 1000.0, 0.4, 1.1},
+ autoscale=false,
+ autoerase=true,
+ autoreplot=true,
+ grid=true,
+ color=true);
+createPlot(
+ id=2,
+ position={1255, 58, 1140, 1286},
+ y={"hexDis.SHR", "hexWetNTU.SHR"},
+ autoscale=true,
+ autoerase=true,
+ autoreplot=true,
+ grid=true,
+ color=true);
+createPlot(
+ id=2,
+ subPlot=2,
+ y={"hexWetNTU.dryFra"},
+ autoscale=true,
+ autoerase=true,
+ autoreplot=true,
+ grid=true,
+ color=true);
+createPlot(
+ id=2,
+ subPlot=3,
+ y={"hexDis.UA_nominal", "hexWetNTU.UA_nominal", "hexWetNTU_TX.UA_nominal"},
+ autoscale=true,
+ autoerase=true,
+ autoreplot=true,
+ grid=true,
+ color=true);
\ No newline at end of file
diff --git a/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTUHeating.mos b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTUHeating.mos
new file mode 100644
index 00000000000..4a5ce5b8a41
--- /dev/null
+++ b/Buildings/Resources/Scripts/Dymola/Fluid/HeatExchangers/Validation/WetCoilEffectivenessNTUHeating.mos
@@ -0,0 +1,34 @@
+simulateModel("Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTUHeating",
+ stopTime=1000,
+ method="cvode",
+ tolerance=1e-6,
+ resultFile="WetCoilEffectivenessNTUHeating");
+createPlot(
+ id=1,
+ position={59, 59, 1186, 1286},
+ y={"hexDis.Q1_flow", "hexWetNTU_TX.Q1_flow", "hexDryNTU_T.Q1_flow"},
+ // range = {0, 1000, -9E4, -5E4},
+ autoscale=true,
+ autoerase=true,
+ autoreplot=true,
+ grid=true,
+ color=true);
+createPlot(
+ id=1,
+ y={"hexDis.sta_b2.T", "hexWetNTU_TX.sta_b2.T", "hexDryNTU_T.sta_b2.T"},
+ // range={0.0, 1000.0, 20.0, 40.0},
+ autoscale=true,
+ autoerase=true,
+ autoreplot=true,
+ grid=true,
+ color=true,
+ subPlot=102);
+createPlot(
+ id=2,
+ position={1255, 58, 1140, 1286},
+ y={"hexDis.UA_nominal", "hexWetNTU_TX.UA_nominal", "hexDryNTU_T.UA_nominal"},
+ autoscale=true,
+ autoerase=true,
+ autoreplot=true,
+ grid=true,
+ color=true);
diff --git a/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.Examples.WetCoilEffectivenessNTUMassFlow.mos b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.Examples.WetCoilEffectivenessNTUMassFlow.mos
new file mode 100644
index 00000000000..304bb5faf26
--- /dev/null
+++ b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.Examples.WetCoilEffectivenessNTUMassFlow.mos
@@ -0,0 +1,7 @@
+compareVars :=
+ {
+ "hex.Q2_flow",
+ "hex.QLat2_flow",
+ "hex.port_a1.m_flow",
+ "hex.port_a2.m_flow"
+ };
diff --git a/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTU.mos b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTU.mos
new file mode 100644
index 00000000000..a91a14248cf
--- /dev/null
+++ b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTU.mos
@@ -0,0 +1,17 @@
+compareVars :=
+ {
+ "hexDis.Q1_flow",
+ "hexWetNTU.Q1_flow",
+ "hexWetNTU_TX.Q1_flow",
+ "hexDis.sta_b2.T",
+ "hexWetNTU.sta_b2.T",
+ "hexWetNTU_TX.sta_b2.T",
+ "relHumOut_dis.phi",
+ "relHumOut_eps.phi",
+ "hexDis.SHR",
+ "hexWetNTU.SHR",
+ "hexWetNTU.dryFra",
+ "hexDis.UA_nominal",
+ "hexWetNTU.UA_nominal",
+ "hexWetNTU_TX.UA_nominal"
+ };
diff --git a/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTUHeating.mos b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTUHeating.mos
new file mode 100644
index 00000000000..20ac91eee59
--- /dev/null
+++ b/Buildings/Resources/Scripts/OpenModelica/compareVars/Buildings.Fluid.HeatExchangers.Validation.WetCoilEffectivenessNTUHeating.mos
@@ -0,0 +1,12 @@
+compareVars :=
+ {
+ "hexDis.Q1_flow",
+ "hexWetNTU_TX.Q1_flow",
+ "hexDryNTU_T.Q1_flow",
+ "hexDis.sta_b2.T",
+ "hexWetNTU_TX.sta_b2.T",
+ "hexDryNTU_T.sta_b2.T",
+ "hexDis.UA_nominal",
+ "hexWetNTU_TX.UA_nominal",
+ "hexDryNTU_T.UA_nominal"
+ };
diff --git a/Buildings/Utilities/Psychrometrics/hSat_pTSat.mo b/Buildings/Utilities/Psychrometrics/hSat_pTSat.mo
new file mode 100644
index 00000000000..968e98a6b55
--- /dev/null
+++ b/Buildings/Utilities/Psychrometrics/hSat_pTSat.mo
@@ -0,0 +1,62 @@
+within Buildings.Utilities.Psychrometrics;
+model hSat_pTSat
+ "Calculate saturation enthalpy given a saturation (dry bulb) temperature"
+ extends Modelica.Blocks.Icons.Block;
+
+ Modelica.Blocks.Interfaces.RealInput p(
+ final quantity="Pressure",
+ final unit="Pa",
+ displayUnit="bar") = 101325
+ "Pressure of the fluid"
+ annotation (Placement(transformation(extent={{-120,30},{-100,50}}),
+ iconTransformation(extent={{-120,30},{-100,50}})));
+ Modelica.Blocks.Interfaces.RealInput TSat(
+ final quantity="ThermodynamicTemperature",
+ final unit="K",
+ min = 0.0,
+ start = 288.15,
+ nominal = 300,
+ displayUnit="degC")
+ "Saturation temperature of the fluid"
+ annotation (Placement(transformation(extent={{-120,-50},{-100,-30}}),
+ iconTransformation(extent={{-120,-50},{-100,-30}})));
+
+ Modelica.Blocks.Interfaces.RealOutput hSat(
+ final quantity="SpecificEnergy",
+ final unit="J/kg")
+ "Dew point temperature of air"
+ annotation (Placement(transformation(extent={{100,-10},{120,10}})));
+
+protected
+ constant Integer watIdx = 1 "Index of water";
+ constant Integer othIdx = 2 "Index of other species";
+ constant Real phiSat(min=0, max=1) = 1 "Saturation relative humidity";
+ Modelica.SIunits.AbsolutePressure pSat
+ "Saturation pressure of water vapor in air at TSat";
+ Real XSat[2]
+ "Mass fractions of water and air in moist air at saturation";
+
+equation
+ pSat = Buildings.Utilities.Psychrometrics.Functions.saturationPressure(TSat);
+ XSat[watIdx] = Buildings.Utilities.Psychrometrics.Functions.X_pSatpphi(
+ pSat=pSat, p=p, phi=phiSat);
+ XSat[othIdx] = 1 - XSat[watIdx];
+ hSat = Buildings.Media.Air.specificEnthalpy_pTX(p=p, T=TSat, X=XSat);
+ annotation (Icon(coordinateSystem(preserveAspectRatio=false)), Diagram(
+ coordinateSystem(preserveAspectRatio=false)),
+ Documentation(revisions="
+
+-
+March 17, 2017, by Michael O'Keefe:
+First implementation. See
+
+issue 622 for more information.
+
+
+", info="
+
+Block to compute the enthalpy of saturated
+air given the saturation temperature and fluid pressure.
+
+"));
+end hSat_pTSat;
diff --git a/Buildings/Utilities/Psychrometrics/package.order b/Buildings/Utilities/Psychrometrics/package.order
index c3517dd1877..5f720a29be2 100644
--- a/Buildings/Utilities/Psychrometrics/package.order
+++ b/Buildings/Utilities/Psychrometrics/package.order
@@ -11,6 +11,7 @@ ToDryAir
ToTotalAir
X_pTphi
X_pW
+hSat_pTSat
pW_TDewPoi
pW_X
Functions
diff --git a/Buildings/package.mo b/Buildings/package.mo
index ddf85960cbc..89d2c803a0c 100644
--- a/Buildings/package.mo
+++ b/Buildings/package.mo
@@ -237,6 +237,14 @@ The new media Buildings.Media.Antifreeze.PropyleneGlycolWater allow
of propylene-glycol water mixtures.
+A new cooling coil model Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU
+has been added. This model is applicable for fully-dry, partially-wet, and fully-wet regimes.
+In contrast to Buildings.Fluid.HeatExchangers.WetCoilCounterFlow and
+to Buildings.Fluid.HeatExchangers.WetCoilDiscretized,
+this model uses the epsilon-NTU relationship rather than a spatial discretization of the coil.
+This leads to fewer state variables and generally to a faster simulation.
+
+
New simplified door models for bi-directional air exchange between thermal zones are
implemented in Buildings.Airflow.Multizone.
@@ -392,6 +400,15 @@ to existing libraries:
Two way valve with the flow characteristic of a butterfly valve.
This is for IBPSA, issue 975. |
+| Buildings.Fluid.HeatExchangers.WetCoilEffectivenessNTU
+ |
+ Cooling coil model applicable for fully-dry, partially-wet, and fully-wet regimes.
+ In contrast to Buildings.Fluid.HeatExchangers.WetCoilCounterFlow and
+ to Buildings.Fluid.HeatExchangers.WetCoilDiscretized,
+ this model uses the epsilon-NTU relationship rather than a spatial discretization of the coil.
+ This leads to fewer state variables and generally to a faster simulation.
+ This is for issue 622. |
+
@@ -757,8 +774,7 @@ have been improved in a
Buildings.Controls.OBC.CDL.Logical.Sources.SampleTrigger
Buildings.Controls.OBC.CDL.Logical.Sources.Pulse
|
- Removed startTime parameter. Introduced shif"
- + "t parameter.
+ | Removed startTime parameter. Introduced shift parameter.
This is for
issue 2170
and issue 2282.
|