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Retrieve correct runtime fraction for AirLoopHVAC:UnitaryHeatCool to be used by AFN #11367

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Merged
mitchute merged 5 commits into from
Jan 7, 2026
+808 −30
Merged

Retrieve correct runtime fraction for AirLoopHVAC:UnitaryHeatCool to be used by AFN #11367

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56f4b29
Fix AFN heating coil runtime fraction retrieval for furnaces. Fix dis…
lymereJ Dec 11, 2025
1ba57ef
Fix copy/paste issue.
lymereJ Dec 12, 2025
18aecd1
Add unit test, add new output variable, add error message when coil i…
lymereJ Dec 12, 2025
47318b8
Merge branch 'develop' into fix_afn_htg_coil_rt_frac
lymereJ Dec 12, 2025
a83373a
Address review comments.
lymereJ Jan 7, 2026
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7 changes: 4 additions & 3 deletions src/EnergyPlus/AirflowNetwork/include/AirflowNetwork/Solver.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,7 @@ namespace AirflowNetwork {
// Members
Real64 InfilVolume; // Volume of Air {m3} due to infiltration
Real64 InfilMass; // Mass of Air {kg} due to infiltration
Real64 infilMassFlow; // Mass flow rate of air {kg/s} due to infiltration
Real64 InfilAirChangeRate; // Infiltration air change rate {ach}
Real64 VentilHeatLoss; // Heat Gain {W} due to ventilation
Real64 VentilHeatGain; // Heat Loss {W} due to ventilation
Expand All @@ -107,9 +108,9 @@ namespace AirflowNetwork {

// Default Constructor
AirflowNetworkReportVars()
: InfilVolume(0.0), InfilMass(0.0), InfilAirChangeRate(0.0), VentilHeatLoss(0.0), VentilHeatGain(0.0), VentilVolume(0.0), VentilMass(0.0),
VentilAirChangeRate(0.0), VentilFanElec(0.0), VentilAirTemp(0.0), MixVolume(0.0), MixMass(0.0), ExfilSensiLoss(0.0),
ExfilLatentLoss(0.0), ExfilTotalLoss(0.0), ExfilMass(0.0), InletMass(0.0), OutletMass(0.0)
: InfilVolume(0.0), InfilMass(0.0), infilMassFlow(0.0), InfilAirChangeRate(0.0), VentilHeatLoss(0.0), VentilHeatGain(0.0),
VentilVolume(0.0), VentilMass(0.0), VentilAirChangeRate(0.0), VentilFanElec(0.0), VentilAirTemp(0.0), MixVolume(0.0), MixMass(0.0),
ExfilSensiLoss(0.0), ExfilLatentLoss(0.0), ExfilTotalLoss(0.0), ExfilMass(0.0), InletMass(0.0), OutletMass(0.0)
{
}
};
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9 changes: 9 additions & 0 deletions src/EnergyPlus/AirflowNetwork/src/Solver.cpp
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Expand Up @@ -6269,6 +6269,13 @@ namespace AirflowNetwork {
OutputProcessor::TimeStepType::System,
OutputProcessor::StoreType::Sum,
Zone(i).Name);
SetupOutputVariable(m_state,
"AFN Zone Infiltration Mass Flow Rate",
Constant::Units::kg_s,
AirflowNetworkZnRpt(i).infilMassFlow,
OutputProcessor::TimeStepType::System,
OutputProcessor::StoreType::Average,
Zone(i).Name);
Comment on lines +6272 to +6278
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@lymereJ lymereJ Dec 12, 2025

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Add a new output variable so users don't have to manually calculate the mass flow rate from the ACH.

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@mitchute mitchute Jan 7, 2026

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Looks ok

SetupOutputVariable(m_state,
"AFN Zone Infiltration Air Change Rate",
Constant::Units::ach,
Expand Down Expand Up @@ -9040,6 +9047,7 @@ namespace AirflowNetwork {
for (auto &e : AirflowNetworkZnRpt) {
e.InfilVolume = 0.0;
e.InfilMass = 0.0;
e.infilMassFlow = 0.0;
e.InfilAirChangeRate = 0.0;
e.VentilVolume = 0.0;
e.VentilMass = 0.0;
Expand Down Expand Up @@ -9324,6 +9332,7 @@ namespace AirflowNetwork {
AirDensity = PsyRhoAirFnPbTdbW(m_state, m_state.dataEnvrn->OutBaroPress, thisZoneHB.MAT, thisZoneHB.airHumRatAvg);

AirflowNetworkZnRpt(i).InfilMass = (exchangeData(i).SumMCp / CpAir) * ReportingConstant;
AirflowNetworkZnRpt(i).infilMassFlow = (exchangeData(i).SumMCp / CpAir);
AirflowNetworkZnRpt(i).InfilVolume = AirflowNetworkZnRpt(i).InfilMass / AirDensity;
AirflowNetworkZnRpt(i).InfilAirChangeRate = AirflowNetworkZnRpt(i).InfilVolume / (TimeStepSys * Zone(i).Volume);
AirflowNetworkZnRpt(i).VentilMass = (exchangeData(i).SumMVCp / CpAir) * ReportingConstant;
Expand Down
60 changes: 59 additions & 1 deletion src/EnergyPlus/Furnaces.cc
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Expand Up @@ -213,6 +213,12 @@ namespace Furnaces {
state.dataFurnaces->GetFurnaceInputFlag = false;
}

// Save the current AFNLoopHeatingCoilMaxRTF for comparison with the one calculated below
Real64 refAFNLoopHeatingCoilMaxRTF(0.0);
if (state.afn->distribution_simulated) {
refAFNLoopHeatingCoilMaxRTF = state.dataAirLoop->AirLoopAFNInfo(AirLoopNum).AFNLoopHeatingCoilMaxRTF;
}

Comment on lines +216 to +221
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@lymereJ lymereJ Dec 12, 2025

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Save the maximum RTF that may have been previously determined from another component and use it later to determine the actual maximum RTF.

// Find the correct Furnace
if (CompIndex == 0) {
FurnaceNum = Util::FindItemInList(FurnaceName, state.dataFurnaces->Furnace);
Expand Down Expand Up @@ -660,6 +666,49 @@ namespace Furnaces {
// Report the current Furnace output
ReportFurnace(state, FurnaceNum, AirLoopNum);

// Get the actual maximum RTF for AFN simulations
if (state.afn->distribution_simulated) {
Real64 heatingCoilRTF = 0.0;
Real64 suppHeatingCoilRTF = 0.0;
bool errorFound(false);
switch (thisFurnace.HeatingCoilType_Num) {
case HVAC::Coil_HeatingGasOrOtherFuel:
case HVAC::Coil_HeatingElectric:
case HVAC::Coil_HeatingDesuperheater: {
int heatingCoilIndex;
HeatingCoils::GetCoilIndex(state, thisFurnace.HeatingCoilName, heatingCoilIndex, errorFound);
if (heatingCoilIndex > 0) {
heatingCoilRTF = state.dataHeatingCoils->HeatingCoil(heatingCoilIndex).RTF;
}
} break;
default:;
}
if (errorFound) {
ShowSevereError(state, format("The index of \"{}\" is not found", thisFurnace.HeatingCoilName));
ShowContinueError(state, format("...occurs for {}", thisFurnace.Name));
errorFound = false;
}
switch (thisFurnace.SuppHeatCoilType_Num) {
case HVAC::Coil_HeatingGasOrOtherFuel:
case HVAC::Coil_HeatingElectric:
case HVAC::Coil_HeatingDesuperheater: {
int suppHeatingCoilIndex;
HeatingCoils::GetCoilIndex(state, thisFurnace.SuppHeatCoilName, suppHeatingCoilIndex, errorFound);
if (suppHeatingCoilIndex > 0) {
suppHeatingCoilRTF = state.dataHeatingCoils->HeatingCoil(suppHeatingCoilIndex).RTF;
}
} break;
default:;
}
if (errorFound) {
ShowSevereError(state, format("The index of \"{}\" is not found", thisFurnace.SuppHeatCoilName));
ShowContinueError(state, format("...occurs for {}", thisFurnace.Name));
errorFound = false;
}
state.dataAirLoop->AirLoopAFNInfo(AirLoopNum).AFNLoopHeatingCoilMaxRTF =
max(refAFNLoopHeatingCoilMaxRTF, heatingCoilRTF, suppHeatingCoilRTF);
}

// Reset OnOffFanPartLoadFraction to 1 in case another on/off fan is called without a part-load curve
state.dataHVACGlobal->OnOffFanPartLoadFraction = 1.0;

Expand Down Expand Up @@ -903,6 +952,7 @@ namespace Furnaces {
// Determine if furnace is on air loop served by the thermostat location specified
for (int zoneInNode = 1; zoneInNode <= state.dataZoneEquip->ZoneEquipConfig(ControlledZoneNum).NumInletNodes; ++zoneInNode) {
int AirLoopNumber = state.dataZoneEquip->ZoneEquipConfig(ControlledZoneNum).InletNodeAirLoopNum(zoneInNode);
thisFurnace.airloopNum = AirLoopNumber;
if (AirLoopNumber > 0) {
for (int BranchNum = 1; BranchNum <= state.dataAirSystemsData->PrimaryAirSystems(AirLoopNumber).NumBranches; ++BranchNum) {
for (int CompNum = 1;
Expand Down Expand Up @@ -1441,6 +1491,7 @@ namespace Furnaces {
// Determine if system is on air loop served by the thermostat location specified
for (int zoneInNode = 1; zoneInNode <= state.dataZoneEquip->ZoneEquipConfig(ControlledZoneNum).NumInletNodes; ++zoneInNode) {
int AirLoopNumber = state.dataZoneEquip->ZoneEquipConfig(ControlledZoneNum).InletNodeAirLoopNum(zoneInNode);
thisFurnace.airloopNum = AirLoopNumber;
if (AirLoopNumber > 0) {
for (int BranchNum = 1; BranchNum <= state.dataAirSystemsData->PrimaryAirSystems(AirLoopNumber).NumBranches; ++BranchNum) {
for (int CompNum = 1;
Expand Down Expand Up @@ -2736,6 +2787,7 @@ namespace Furnaces {
// Determine if furnace is on air loop served by the thermostat location specified
for (int zoneInNode = 1; zoneInNode <= state.dataZoneEquip->ZoneEquipConfig(ControlledZoneNum).NumInletNodes; ++zoneInNode) {
int AirLoopNumber = state.dataZoneEquip->ZoneEquipConfig(ControlledZoneNum).InletNodeAirLoopNum(zoneInNode);
thisFurnace.airloopNum = AirLoopNumber;
if (AirLoopNumber > 0) {
for (int BranchNum = 1; BranchNum <= state.dataAirSystemsData->PrimaryAirSystems(AirLoopNumber).NumBranches; ++BranchNum) {
for (int CompNum = 1;
Expand Down Expand Up @@ -3667,6 +3719,7 @@ namespace Furnaces {
// Determine if furnace is on air loop served by the thermostat location specified
for (int zoneInNode = 1; zoneInNode <= state.dataZoneEquip->ZoneEquipConfig(ControlledZoneNum).NumInletNodes; ++zoneInNode) {
int AirLoopNumber = state.dataZoneEquip->ZoneEquipConfig(ControlledZoneNum).InletNodeAirLoopNum(zoneInNode);
thisFurnace.airloopNum = AirLoopNumber;
if (AirLoopNumber > 0) {
for (int BranchNum = 1; BranchNum <= state.dataAirSystemsData->PrimaryAirSystems(AirLoopNumber).NumBranches; ++BranchNum) {
for (int CompNum = 1;
Expand Down Expand Up @@ -4761,7 +4814,6 @@ namespace Furnaces {
// Pass the fan cycling schedule index up to the air loop. Set the air loop unitary system flag.
state.dataAirLoop->AirLoopControlInfo(AirLoopNum).cycFanSched = thisFurnace.fanOpModeSched;
state.dataAirLoop->AirLoopControlInfo(AirLoopNum).UnitarySys = true;
// RR this is wrong, Op mode needs to be updated each time atep
state.dataAirLoop->AirLoopControlInfo(AirLoopNum).fanOp = thisFurnace.fanOp;

// Check that heat pump heating capacity is within 20% of cooling capacity
Expand Down Expand Up @@ -6273,6 +6325,12 @@ namespace Furnaces {
CheckSysSizing(state, HVAC::unitarySysTypeNames[(int)thisFurnace.type], thisFurnace.Name);

thisFurnace.DesignHeatingCapacity = state.dataSize->FinalSysSizing(state.dataSize->CurSysNum).HeatCap;
if (state.dataSize->FinalSysSizing(state.dataSize->CurSysNum).FractionOfAutosizedHeatingCapacity > 0) {
// apply sizing factor and reset it to 1.0 so it doesn't get apply again during heating coil sizing
thisFurnace.DesignHeatingCapacity *=
state.dataSize->FinalSysSizing(state.dataSize->CurSysNum).FractionOfAutosizedHeatingCapacity;
state.dataSize->FinalSysSizing(state.dataSize->CurSysNum).FractionOfAutosizedHeatingCapacity = 1.0;
}
Comment on lines +6328 to +6333
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@lymereJ lymereJ Dec 12, 2025

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System size is determined first, then heating coil size is determined after. In the former, the FractionOfAutosizedHeatingCapacity is not taken into account when sizing the system, but it is when sizing the coil. If the coil is part of a system, the system size is used for the coil and is modified by FractionOfAutosizedHeatingCapacity. Here we're applying FractionOfAutosizedHeatingCapacity to the system size and reset to 1 so it doesn't get used again to size the heating coil.

With develop:

 Component Sizing Information, AirLoopHVAC:UnitaryHeatCool, ACANDF_UNIT1, Nominal Heating Capacity [W], 8519.83583
 Component Sizing Information, Coil:Heating:Fuel, MAIN FUEL HEATING COIL_UNIT1, Design Size Nominal Capacity [W], 10649.79479

With this branch:

 Component Sizing Information, AirLoopHVAC:UnitaryHeatCool, ACANDF_UNIT1, Nominal Heating Capacity [W], 10649.79479
 Component Sizing Information, Coil:Heating:Fuel, MAIN FUEL HEATING COIL_UNIT1, Design Size Nominal Capacity [W], 10649.79479

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@rraustad rraustad Jan 7, 2026

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This looks better.

}

if (thisFurnace.DesignHeatingCapacity < HVAC::SmallLoad) {
Expand Down
54 changes: 28 additions & 26 deletions src/EnergyPlus/Furnaces.hh
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Expand Up @@ -115,6 +115,7 @@ namespace Furnaces {
Sched::Schedule *fanOpModeSched = nullptr; // fan operating mode schedule
Sched::Schedule *fanAvailSched = nullptr; // fan availability schedule
int ControlZoneNum; // Index to controlled zone
int airloopNum; // Index to air loop
int ZoneSequenceCoolingNum; // Index to cooling sequence/priority for this zone
int ZoneSequenceHeatingNum; // Index to heating sequence/priority for this zone
int CoolingCoilType_Num; // Numeric Equivalent for Cooling Coil Type
Expand Down Expand Up @@ -256,32 +257,33 @@ namespace Furnaces {
int ErrCountVar2 = 0; // Counter used to minimize the occurrence of output warnings

FurnaceEquipConditions()
: FurnaceIndex(0), ControlZoneNum(0), ZoneSequenceCoolingNum(0), ZoneSequenceHeatingNum(0), CoolingCoilType_Num(0), CoolingCoilIndex(0),
ActualDXCoilIndexForHXAssisted(0), CoolingCoilUpstream(true), HeatingCoilType_Num(0), HeatingCoilIndex(0), ReheatingCoilType_Num(0),
ReheatingCoilIndex(0), CoilControlNode(0), HWCoilAirInletNode(0), HWCoilAirOutletNode(0), SuppCoilAirInletNode(0),
SuppCoilAirOutletNode(0), SuppHeatCoilType_Num(0), SuppHeatCoilIndex(0), SuppCoilControlNode(0), fanType(HVAC::FanType::Invalid),
FanIndex(0), FurnaceInletNodeNum(0), FurnaceOutletNodeNum(0), LastMode(Furnaces::ModeOfOperation::Invalid),
AirFlowControl(AirFlowControlConstFan::Invalid), fanPlace(HVAC::FanPlace::Invalid), NodeNumOfControlledZone(0),
CoolingConvergenceTolerance(0.0), HeatingConvergenceTolerance(0.0), DesignHeatingCapacity(0.0), DesignCoolingCapacity(0.0),
CoolingCoilSensDemand(0.0), HeatingCoilSensDemand(0.0), CoolingCoilLatentDemand(0.0), DesignSuppHeatingCapacity(0.0),
DesignFanVolFlowRate(0.0), DesignFanVolFlowRateEMSOverrideOn(false), DesignFanVolFlowRateEMSOverrideValue(0.0), DesignMassFlowRate(0.0),
MaxCoolAirVolFlow(0.0), MaxCoolAirVolFlowEMSOverrideOn(false), MaxCoolAirVolFlowEMSOverrideValue(0.0), MaxHeatAirVolFlow(0.0),
MaxHeatAirVolFlowEMSOverrideOn(false), MaxHeatAirVolFlowEMSOverrideValue(0.0), MaxNoCoolHeatAirVolFlow(0.0),
MaxNoCoolHeatAirVolFlowEMSOverrideOn(false), MaxNoCoolHeatAirVolFlowEMSOverrideValue(0.0), MaxCoolAirMassFlow(0.0),
MaxHeatAirMassFlow(0.0), MaxNoCoolHeatAirMassFlow(0.0), MaxHeatCoilFluidFlow(0.0), MaxSuppCoilFluidFlow(0.0),
ControlZoneMassFlowFrac(0.0), DesignMaxOutletTemp(9999.0), MdotFurnace(0.0), FanPartLoadRatio(0.0), CompPartLoadRatio(0.0),
CoolPartLoadRatio(0.0), HeatPartLoadRatio(0.0), MinOATCompressorCooling(0.0), MinOATCompressorHeating(0.0), MaxOATSuppHeat(0.0),
CondenserNodeNum(0), Humidistat(false), InitHeatPump(false), DehumidControlType_Num(DehumidificationControlMode::None),
LatentMaxIterIndex(0), LatentRegulaFalsiFailedIndex(0), LatentRegulaFalsiFailedIndex2(0), SensibleMaxIterIndex(0),
SensibleRegulaFalsiFailedIndex(0), WSHPHeatMaxIterIndex(0), WSHPHeatRegulaFalsiFailedIndex(0), DXHeatingMaxIterIndex(0),
DXHeatingRegulaFalsiFailedIndex(0), HeatingMaxIterIndex(0), HeatingMaxIterIndex2(0), HeatingRegulaFalsiFailedIndex(0),
ActualFanVolFlowRate(0.0), HeatingSpeedRatio(1.0), CoolingSpeedRatio(1.0), NoHeatCoolSpeedRatio(1.0), ZoneInletNode(0),
SenLoadLoss(0.0), LatLoadLoss(0.0), SensibleLoadMet(0.0), LatentLoadMet(0.0), DehumidInducedHeatingDemandRate(0.0), CoilOutletNode(0),
plantLoc{}, SuppPlantLoc{}, HotWaterCoilMaxIterIndex(0), HotWaterCoilMaxIterIndex2(0), EMSOverrideSensZoneLoadRequest(false),
EMSSensibleZoneLoadValue(0.0), EMSOverrideMoistZoneLoadRequest(false), EMSMoistureZoneLoadValue(0.0),
HeatCoolMode(Furnaces::ModeOfOperation::Invalid), NumOfSpeedCooling(0), NumOfSpeedHeating(0), IdleSpeedRatio(0.0),
IdleVolumeAirRate(0.0), IdleMassFlowRate(0.0), FanVolFlow(0.0), CheckFanFlow(true), HeatVolumeFlowRate(HVAC::MaxSpeedLevels, 0.0),
HeatMassFlowRate(HVAC::MaxSpeedLevels, 0.0), CoolVolumeFlowRate(HVAC::MaxSpeedLevels, 0.0), CoolMassFlowRate(HVAC::MaxSpeedLevels, 0.0),
: FurnaceIndex(0), ControlZoneNum(0), airloopNum(0), ZoneSequenceCoolingNum(0), ZoneSequenceHeatingNum(0), CoolingCoilType_Num(0),
CoolingCoilIndex(0), ActualDXCoilIndexForHXAssisted(0), CoolingCoilUpstream(true), HeatingCoilType_Num(0), HeatingCoilIndex(0),
ReheatingCoilType_Num(0), ReheatingCoilIndex(0), CoilControlNode(0), HWCoilAirInletNode(0), HWCoilAirOutletNode(0),
SuppCoilAirInletNode(0), SuppCoilAirOutletNode(0), SuppHeatCoilType_Num(0), SuppHeatCoilIndex(0), SuppCoilControlNode(0),
fanType(HVAC::FanType::Invalid), FanIndex(0), FurnaceInletNodeNum(0), FurnaceOutletNodeNum(0),
LastMode(Furnaces::ModeOfOperation::Invalid), AirFlowControl(AirFlowControlConstFan::Invalid), fanPlace(HVAC::FanPlace::Invalid),
NodeNumOfControlledZone(0), CoolingConvergenceTolerance(0.0), HeatingConvergenceTolerance(0.0), DesignHeatingCapacity(0.0),
DesignCoolingCapacity(0.0), CoolingCoilSensDemand(0.0), HeatingCoilSensDemand(0.0), CoolingCoilLatentDemand(0.0),
DesignSuppHeatingCapacity(0.0), DesignFanVolFlowRate(0.0), DesignFanVolFlowRateEMSOverrideOn(false),
DesignFanVolFlowRateEMSOverrideValue(0.0), DesignMassFlowRate(0.0), MaxCoolAirVolFlow(0.0), MaxCoolAirVolFlowEMSOverrideOn(false),
MaxCoolAirVolFlowEMSOverrideValue(0.0), MaxHeatAirVolFlow(0.0), MaxHeatAirVolFlowEMSOverrideOn(false),
MaxHeatAirVolFlowEMSOverrideValue(0.0), MaxNoCoolHeatAirVolFlow(0.0), MaxNoCoolHeatAirVolFlowEMSOverrideOn(false),
MaxNoCoolHeatAirVolFlowEMSOverrideValue(0.0), MaxCoolAirMassFlow(0.0), MaxHeatAirMassFlow(0.0), MaxNoCoolHeatAirMassFlow(0.0),
MaxHeatCoilFluidFlow(0.0), MaxSuppCoilFluidFlow(0.0), ControlZoneMassFlowFrac(0.0), DesignMaxOutletTemp(9999.0), MdotFurnace(0.0),
FanPartLoadRatio(0.0), CompPartLoadRatio(0.0), CoolPartLoadRatio(0.0), HeatPartLoadRatio(0.0), MinOATCompressorCooling(0.0),
MinOATCompressorHeating(0.0), MaxOATSuppHeat(0.0), CondenserNodeNum(0), Humidistat(false), InitHeatPump(false),
DehumidControlType_Num(DehumidificationControlMode::None), LatentMaxIterIndex(0), LatentRegulaFalsiFailedIndex(0),
LatentRegulaFalsiFailedIndex2(0), SensibleMaxIterIndex(0), SensibleRegulaFalsiFailedIndex(0), WSHPHeatMaxIterIndex(0),
WSHPHeatRegulaFalsiFailedIndex(0), DXHeatingMaxIterIndex(0), DXHeatingRegulaFalsiFailedIndex(0), HeatingMaxIterIndex(0),
HeatingMaxIterIndex2(0), HeatingRegulaFalsiFailedIndex(0), ActualFanVolFlowRate(0.0), HeatingSpeedRatio(1.0), CoolingSpeedRatio(1.0),
NoHeatCoolSpeedRatio(1.0), ZoneInletNode(0), SenLoadLoss(0.0), LatLoadLoss(0.0), SensibleLoadMet(0.0), LatentLoadMet(0.0),
DehumidInducedHeatingDemandRate(0.0), CoilOutletNode(0), plantLoc{}, SuppPlantLoc{}, HotWaterCoilMaxIterIndex(0),
HotWaterCoilMaxIterIndex2(0), EMSOverrideSensZoneLoadRequest(false), EMSSensibleZoneLoadValue(0.0),
EMSOverrideMoistZoneLoadRequest(false), EMSMoistureZoneLoadValue(0.0), HeatCoolMode(Furnaces::ModeOfOperation::Invalid),
NumOfSpeedCooling(0), NumOfSpeedHeating(0), IdleSpeedRatio(0.0), IdleVolumeAirRate(0.0), IdleMassFlowRate(0.0), FanVolFlow(0.0),
CheckFanFlow(true), HeatVolumeFlowRate(HVAC::MaxSpeedLevels, 0.0), HeatMassFlowRate(HVAC::MaxSpeedLevels, 0.0),
CoolVolumeFlowRate(HVAC::MaxSpeedLevels, 0.0), CoolMassFlowRate(HVAC::MaxSpeedLevels, 0.0),
MSHeatingSpeedRatio(HVAC::MaxSpeedLevels, 0.0), MSCoolingSpeedRatio(HVAC::MaxSpeedLevels, 0.0), bIsIHP(false), CompSpeedNum(0),
CompSpeedRatio(0.0), ErrIndexCyc(0), ErrIndexVar(0), iterationCounter(0), iterationMode(0), FirstPass(true)
{
Expand Down
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