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Fix HVAC Sizing Summary Min OA flow for Spaces #10728

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merged 1 commit into from
Sep 12, 2024
Merged

Fix HVAC Sizing Summary Min OA flow for Spaces #10728

merged 1 commit into from
Sep 12, 2024

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mjwitte
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@mjwitte mjwitte commented Sep 12, 2024 •
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Pull request overview

  • Fixes HVAC Sizing Summary, Minimum Outdoor Air Flow Rate always zero for Spaces.

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@mjwitte mjwitte added the Defect Includes code to repair a defect in EnergyPlus label Sep 12, 2024
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⚠️ Regressions detected on macos-14 for commit bb4552c

Regression Summary
  • EIO: 2
  • Table Big Diffs: 2
  • SSZ Big Diffs: 1
  • Table String Diffs: 1

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mjwitte commented Sep 12, 2024

With develop, HVAC Sizing Summary, Minimum Outdoor Air Flow Rate is always zero for Spaces. 5ZoneAirCooledWithSpacesHVAC
image
With this branch:
image

For 5ZoneAirCooledWithSpaceHeatBalance which has one space per zone, the OA rates in the space table match the OA rates in the zone table. (And for 5ZoneAirCooledWithSpacesHVAC, the space OA rates add up to the zone OA rates).
image
image

mjwitte
mjwitte commented Sep 12, 2024
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Code walkthru

src/EnergyPlus/DataSizing.cc
bool const UseMinOASchFlag, // Use min OA schedule in DesignSpecification:OutdoorAir object
bool const PerPersonNotSet, // when calculation should not include occupants (e.g., dual duct)
bool const MaxOAVolFlowFlag, // TRUE when calculation uses occupancy schedule (e.g., dual duct)
int const spaceNum)
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Add spaceNum parameter to several OA function calls.

src/EnergyPlus/DataSizing.cc
PerPersonNotSet,
MaxOAVolFlowFlag,
thisDSOA.dsoaSpaceIndexes(dsoaCount));
if ((spaceNum == 0) || ((spaceNum > 0) && (spaceNum == thisDSOA.dsoaSpaceIndexes(dsoaCount)))) {
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When calculating for a DesignSpecification:OutdoorAir:SpaceList, if spaceNum==0 then sum all the spaces on the list, otherwise "sum" only the matching space. Same approach for 3 OA functions.

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Makes sense.

src/EnergyPlus/ZoneEquipmentManager.cc
Comment on lines -1002 to -1006
// Use the max occupancy PEOPLE structure to calculate design min OA for each zone from the outside air flow per person input
Real64 TotPeopleInZone = 0.0;
Real64 ZoneMinOccupancy = 0.;
int DSOAPtr = finalZoneSizing.ZoneDesignSpecOAIndex; // index to DesignSpecification:OutdoorAir object
if ((DSOAPtr > 0) && !dsoaError) {
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Move a chunk of code to a separate function so it can be called for zones or spaces.

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👍

src/EnergyPlus/ZoneEquipmentManager.cc
Comment on lines +1047 to +1058
void calcSizingOA(EnergyPlusData &state,
DataSizing::ZoneSizingData &zsFinalSizing,
DataSizing::ZoneSizingData &zsCalcFinalSizing,
bool &dsoaError,
bool &ErrorsFound,
int const zoneNum,
int const spaceNum)
{
// Use the max occupancy PEOPLE structure to calculate design min OA for each zone from the outside air flow per person input
Real64 TotPeopleInZone = 0.0;
Real64 ZoneMinOccupancy = 0.;
int DSOAPtr = zsFinalSizing.ZoneDesignSpecOAIndex; // index to DesignSpecification:OutdoorAir object
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Here's the new function.

@mjwitte mjwitte added this to the EnergyPlus 24.2 milestone Sep 12, 2024
Myoldmopar
Myoldmopar approved these changes Sep 12, 2024
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Looks good to me.

src/EnergyPlus/DataSizing.cc
PerPersonNotSet,
MaxOAVolFlowFlag,
thisDSOA.dsoaSpaceIndexes(dsoaCount));
if ((spaceNum == 0) || ((spaceNum > 0) && (spaceNum == thisDSOA.dsoaSpaceIndexes(dsoaCount)))) {
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Makes sense.

src/EnergyPlus/DataSizing.hh
Real64 desFlowPerZonePerson(EnergyPlusData &state,
int const actualZoneNum // Zone index
);
Real64 desFlowPerZonePerson(EnergyPlusData &state, int const actualZoneNum, int const spaceNum = 0);
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Nice. Love the default argument value usage here. Clean.

src/EnergyPlus/ZoneEquipmentManager.cc
Comment on lines -1002 to -1006
// Use the max occupancy PEOPLE structure to calculate design min OA for each zone from the outside air flow per person input
Real64 TotPeopleInZone = 0.0;
Real64 ZoneMinOccupancy = 0.;
int DSOAPtr = finalZoneSizing.ZoneDesignSpecOAIndex; // index to DesignSpecification:OutdoorAir object
if ((DSOAPtr > 0) && !dsoaError) {
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👍

@Myoldmopar
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Happy with develop pulled in, let's get this in. Thanks @mjwitte

@Myoldmopar Myoldmopar merged commit d66e1dd into develop Sep 12, 2024
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@Myoldmopar Myoldmopar deleted the spaceSizingFixes branch September 12, 2024 16:17
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@Myoldmopar Myoldmopar Myoldmopar approved these changes

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Defect Includes code to repair a defect in EnergyPlus
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