Skip to content

Commit

Permalink
address more comments
Browse files Browse the repository at this point in the history
  • Loading branch information
@xuanluo113
xuanluo113 committed Mar 1, 2021
1 parent 0f4ff6e commit 55c3309
Show file tree
Hide file tree
Showing 3 changed files with 26 additions and 31 deletions.
4 changes: 2 additions & 2 deletions ...g-reference/src/simulation-models-encyclopedic-reference-005/occupant-thermal-comfort.tex
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1165,11 +1165,11 @@ \subsubsection{Description of the model and algorithm}\label{description-of-the-

\subsection{ASHRAE 55 Elevated Air Speed Cooling Effect Model}\label{elevated-air-speed-ce-model}

ASHRAE Standard 55-2017 Section 5.3 requires that the Elevated Air Speed Comfort Zone Method be used when average air speed \(V_{a}\) is greater than 0.10 m/s. The method provides cooling credit for elevated air velocity in the space. The method can be used to evaluate passive cooling technologies such as natural ventilation, ceiling fan, and portable fan.
ASHRAE Standard 55-2017 Section 5.3 requires that the Elevated Air Speed Comfort Zone Method be used when average air speed \(v_{a}\) is greater than 0.10 m/s. The method provides cooling credit for elevated air velocity in the space. The method can be used to evaluate passive cooling technologies such as natural ventilation, ceiling fan, and portable fan.

\subsubsection{Description of the model and algorithm}\label{description-of-the-model-and-algorithm-4}

The Pierce Two-Node Standard Effective Temperature (SET) model is used to account for the cooling effect of air speeds greater than the 0.10 m/s. Specifically, for a given set of environmental and personal variables, including an elevated average air speed, an average air temperature \(t_{a}\), and a mean radiant temperature \(t_{r}\), the SET is first calculated. Then the average air speed \(V_{a}\) is replaced by still air (0.1 m/s), and the average air temperature and radiant temperature are adjusted according to the cooling effect (CE). The CE of the elevated air speed is the value that, when subtracted equally from both the average air temperature and the mean radiant temperature, yields the same SET under still air as in the first SET calculation under elevated air speed.
The Pierce Two-Node Standard Effective Temperature (SET) model is used to account for the cooling effect of air speeds greater than the 0.10 m/s. Specifically, for a given set of environmental and personal variables, including an elevated average air speed, an average air temperature \(t_{a}\), and a mean radiant temperature \(t_{r}\), the SET is first calculated. Then the average air speed \(v_{a}\) is replaced by still air (0.1 m/s), and the average air temperature and radiant temperature are adjusted according to the cooling effect (CE). The CE of the elevated air speed is the value that, when subtracted equally from both the average air temperature and the mean radiant temperature, yields the same SET under still air as in the first SET calculation under elevated air speed.

The following is a formal description of this process. To define the CE, we assert that it satisfies the following:

Expand Down
6 changes: 3 additions & 3 deletions doc/input-output-reference/src/overview/group-internal-gains-people-lights-other.tex
View file
Original file line number Diff line number Diff line change
Expand Up @@ -594,15 +594,15 @@ \subsubsection{Outputs}\label{outputs-017}

\paragraph{Zone Thermal Comfort ASHRAE 55 Elevated Air Speed Cooling Effect Adjusted PMV}\label{zone-thermal-comfort-ashrae55-elevated-air-speed-cooling-effect-adjusted-pmv}

This field is the \"predicted mean vote\" (PMV) calculated using the Fanger PMV model, adjusted by the ASHRAE 55 Elevated Air Speed Cooling Effect. The Cooling Effect adjusted PMV for an environment with elevated average air speed is calculated using the adjusted average air temperature, the adjusted radiant temperature, and still air (0.1 m/s).
This field is the ``predicted mean vote'' (PMV) calculated using the Fanger PMV model, adjusted by the ASHRAE 55 Elevated Air Speed Cooling Effect. The Cooling Effect adjusted PMV for an environment with elevated average air speed is calculated using the adjusted average air temperature, the adjusted radiant temperature, and still air (0.1 m/s).

\paragraph{Zone Thermal Comfort ASHRAE 55 Elevated Air Speed Cooling Effect Adjusted PPD}\label{zone-thermal-comfort-ashrae55-elevated-air-speed-cooling-effect-adjusted-ppd}

This field is the \"ppredicted percentage of dissatisfied\" (PPD) calculated using the Fanger PMV-PPD model, adjusted by the ASHRAE 55 Elevated Air Speed Cooling Effect. The Cooling Effect adjusted PPD for an environment with elevated average air speed is calculated using the adjusted average air temperature, the adjusted radiant temperature, and still air (0.1 m/s).
This field is the ``predicted percentage of dissatisfied'' (PPD) calculated using the Fanger PMV-PPD model, adjusted by the ASHRAE 55 Elevated Air Speed Cooling Effect. The Cooling Effect adjusted PPD for an environment with elevated average air speed is calculated using the adjusted average air temperature, the adjusted radiant temperature, and still air (0.1 m/s).

\paragraph{Zone Thermal Comfort ASHRAE 55 Ankle Draft PPD}\label{zone-thermal-comfort-ashrae55-ankle-draft-ppd}

This field is the \"ppredicted percentage of dissatisfied\" (PPD) on draft at ankle level. It is used as the metric to evaluate the ankle draft risk as a function of PMV and air speed at the ankle level (0.1 m).
This field is the ``ppredicted percentage of dissatisfied'' (PPD) on draft at ankle level. It is used as the metric to evaluate the ankle draft risk as a function of PMV and air speed at the ankle level (0.1 m).

\subsubsection{Outputs}\label{outputs-1-014}

Expand Down
47 changes: 21 additions & 26 deletions src/EnergyPlus/ThermalComfort.cc
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1212,32 +1212,27 @@ namespace ThermalComfort {
PPD_AD = (std::exp(-2.58 + 3.05 * AnkleAirVel - 1.06 * PMV) / (1 + std::exp(-2.58 + 3.05 * AnkleAirVel - 1.06 * PMV))) * 100.0;

} else {
if (RelAirVel >= 0.2) {
ShowRecurringWarningErrorAtEnd(state, "Relative air velocity is above 0.2 m/s in Ankle draft PPD calculations. PPD at ankle draft will be set to -1.0.",
state.dataThermalComforts->AnkleDraftAirVelWarningInd,
RelAirVel,
RelAirVel,
_,
"[m/s]",
"[m/s]");
}
if (state.dataThermalComforts->ActMet >= 1.3) {
ShowRecurringWarningErrorAtEnd(state, "Metabolic rate is above 1.3 met in Ankle draft PPD calculations. PPD at ankle draft will be set to -1.0.",
state.dataThermalComforts->AnkleDraftActMetWarningInd,
state.dataThermalComforts->ActMet,
state.dataThermalComforts->ActMet,
_,
"[m/s]",
"[m/s]");
}
if (state.dataThermalComforts->CloUnit >= 0.7) {
ShowRecurringWarningErrorAtEnd(state, "Clothing unit is above 0.7 in Ankle draft PPD calculations. PPD at ankle draft will be set to -1.0.",
state.dataThermalComforts->AnkleDraftCloUnitWarningInd,
state.dataThermalComforts->CloUnit,
state.dataThermalComforts->CloUnit,
_,
"[m/s]",
"[m/s]");
if (state.dataGlobal->DisplayExtraWarnings) {
if (RelAirVel >= 0.2) {
ShowRecurringWarningErrorAtEnd(state,
"Relative air velocity is above 0.2 m/s in Ankle draft PPD calculations. PPD at ankle draft will be set to -1.0.",
state.dataThermalComforts->AnkleDraftAirVelWarningInd, RelAirVel,
RelAirVel, _, "[m/s]", "[m/s]");
}
if (state.dataThermalComforts->ActMet >= 1.3) {
ShowRecurringWarningErrorAtEnd(state,
"Metabolic rate is above 1.3 met in Ankle draft PPD calculations. PPD at ankle draft will be set to -1.0.",
state.dataThermalComforts->AnkleDraftActMetWarningInd,
state.dataThermalComforts->ActMet, state.dataThermalComforts->ActMet,
_, "[m/s]", "[m/s]");
}
if (state.dataThermalComforts->CloUnit >= 0.7) {
ShowRecurringWarningErrorAtEnd(state,
"Clothing unit is above 0.7 in Ankle draft PPD calculations. PPD at ankle draft will be set to -1.0.",
state.dataThermalComforts->AnkleDraftCloUnitWarningInd,
state.dataThermalComforts->CloUnit,
state.dataThermalComforts->CloUnit, _, "[m/s]", "[m/s]");
}
}
}
state.dataThermalComforts->ThermalComfortData(state.dataThermalComforts->PeopleNum).AnkleDraftPPDASH55 = PPD_AD;
Expand Down

2 comments on commit 55c3309

@nrel-bot-3
Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

pmv-follow-up (xuanluo113) - x86_64-MacOS-10.15-clang-11.0.0: Tests Failed (0 of 0 tests passed, 0 test warnings)

Build Badge Test Badge

@nrel-bot
Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

pmv-follow-up (xuanluo113) - Win64-Windows-10-VisualStudio-16: Tests Failed (0 of 0 tests passed, 0 test warnings)

Build Badge Test Badge

Please sign in to comment.