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Fix chiller chilling when it is off #10793

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Fix chiller chilling when it is off #10793

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0e0005b
Warn if chiller chills when off
mjwitte Oct 17, 2024
e827c62
Warn if chiller chills when off
mjwitte Oct 17, 2024
394a2c7
Fix chiller off when condenser flow is zero
mjwitte Oct 17, 2024
172283a
Revert Warn if chiller chills when off
mjwitte Oct 18, 2024
c894587
Fix chiller off when condenser flow is zero for all other chillers
mjwitte Oct 29, 2024
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1 change: 1 addition & 0 deletions src/EnergyPlus/ChillerAbsorption.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -1728,6 +1728,7 @@ void BLASTAbsorberSpecs::calculate(EnergyPlusData &state, Real64 &MyLoad, bool R
this->CondOutletTemp = state.dataLoopNodes->Node(this->CondInletNodeNum).Temp;
this->CondMassFlowRate = 0.0;
this->QCondenser = 0.0;
MyLoad = 0.0;
return;
// V7 plant upgrade, no longer fatal here anymore, set some things and return
}
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7 changes: 6 additions & 1 deletion src/EnergyPlus/ChillerElectricASHRAE205.cc
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Expand Up @@ -1337,7 +1337,12 @@ void ASHRAE205ChillerSpecs::calculate(EnergyPlusData &state, Real64 &MyLoad, boo
PlantUtilities::PullCompInterconnectTrigger(
state, this->CWPlantLoc, this->CondMassFlowIndex, this->CDPlantLoc, DataPlant::CriteriaType::MassFlowRate, this->CondMassFlowRate);

if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) return;
if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) {
MyLoad = 0.0;
this->Power = standbyPower;
this->AmbientZoneGain = standbyPower;
return;
}
}
Real64 EvapOutletTempSetPoint(0.0); // Evaporator outlet temperature setpoint [C]
switch (state.dataPlnt->PlantLoop(PlantLoopNum).LoopDemandCalcScheme) {
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2 changes: 2 additions & 0 deletions src/EnergyPlus/ChillerElectricEIR.cc
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Expand Up @@ -1962,6 +1962,8 @@ void ElectricEIRChillerSpecs::calculate(EnergyPlusData &state, Real64 &MyLoad, b
state, this->CWPlantLoc, this->CondMassFlowIndex, this->CDPlantLoc, DataPlant::CriteriaType::MassFlowRate, this->CondMassFlowRate);

if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) {
// Shut chiller off if there is no condenser water flow
MyLoad = 0.0;
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@rraustad rraustad Oct 19, 2024 •
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This does look like it boils down to this. I looked at PullCompInterconnectTrigger to see what that was trying to accomplish. This code looks like it can be deleted. I'm not asking for that to happen here but it's extra clock cycles. Removed in #10794,

    // Check to make sure we didn't reuse the index in multiple components
    if (CurCriteria.CallingCompLoopNum != plantLoc.loopNum || CurCriteria.CallingCompLoopSideNum != plantLoc.loopSideNum ||
        CurCriteria.CallingCompBranchNum != plantLoc.branchNum || CurCriteria.CallingCompCompNum != plantLoc.compNum) {
        // Diagnostic fatal: component does not properly utilize unique indexing
    }

if (this->EvapMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) {
// Use PlantUtilities::SetComponentFlowRate to decide actual flow
PlantUtilities::SetComponentFlowRate(
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3 changes: 2 additions & 1 deletion src/EnergyPlus/ChillerIndirectAbsorption.cc
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Expand Up @@ -1604,7 +1604,7 @@ void IndirectAbsorberSpecs::sizeChiller(EnergyPlusData &state)
}
}

void IndirectAbsorberSpecs::calculate(EnergyPlusData &state, Real64 const MyLoad, bool const RunFlag)
void IndirectAbsorberSpecs::calculate(EnergyPlusData &state, Real64 MyLoad, bool const RunFlag)
{
// SUBROUTINE INFORMATION:
// AUTHOR R. Raustad (FSEC)
Expand Down Expand Up @@ -1999,6 +1999,7 @@ void IndirectAbsorberSpecs::calculate(EnergyPlusData &state, Real64 const MyLoad
this->CondOutletTemp = CondInletTemp;
this->CondMassFlowRate = 0.0;
this->QCondenser = 0.0;
MyLoad = 0.0;
return;
// V7 plant upgrade, no longer fatal here anymore... set some things and return
}
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5 changes: 4 additions & 1 deletion src/EnergyPlus/ChillerReformulatedEIR.cc
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Expand Up @@ -2147,7 +2147,10 @@ void ReformulatedEIRChillerSpecs::calculate(EnergyPlusData &state, Real64 &MyLoa
PlantUtilities::PullCompInterconnectTrigger(
state, this->CWPlantLoc, this->CondMassFlowIndex, this->CDPlantLoc, DataPlant::CriteriaType::MassFlowRate, this->CondMassFlowRate);

if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) return;
if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) {
MyLoad = 0.0;
return;
}
}
Real64 FRAC = 1.0;
Real64 EvapOutletTempSetPoint(0.0); // Evaporator outlet temperature setpoint [C]
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20 changes: 16 additions & 4 deletions src/EnergyPlus/PlantChillers.cc
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Expand Up @@ -1468,7 +1468,10 @@ namespace PlantChillers {
PlantUtilities::SetComponentFlowRate(state, this->CondMassFlowRate, this->CondInletNodeNum, this->CondOutletNodeNum, this->CDPlantLoc);
PlantUtilities::PullCompInterconnectTrigger(
state, this->CWPlantLoc, this->CondMassFlowIndex, this->CDPlantLoc, DataPlant::CriteriaType::MassFlowRate, this->CondMassFlowRate);
if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) return;
if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) {
MyLoad = 0.0;
return;
}
}

// LOAD LOCAL VARIABLES FROM DATA STRUCTURE (for code readability)
Expand Down Expand Up @@ -3593,7 +3596,10 @@ namespace PlantChillers {
PlantUtilities::SetComponentFlowRate(state, this->CondMassFlowRate, this->CondInletNodeNum, this->CondOutletNodeNum, this->CDPlantLoc);
PlantUtilities::PullCompInterconnectTrigger(
state, this->CWPlantLoc, this->CondMassFlowIndex, this->CDPlantLoc, DataPlant::CriteriaType::MassFlowRate, this->CondMassFlowRate);
if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) return;
if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) {
MyLoad = 0.0;
return;
}
}

// LOAD LOCAL VARIABLES FROM DATA STRUCTURE (for code readability)
Expand Down Expand Up @@ -5605,7 +5611,10 @@ namespace PlantChillers {
PlantUtilities::PullCompInterconnectTrigger(
state, this->CWPlantLoc, this->CondMassFlowIndex, this->CDPlantLoc, DataPlant::CriteriaType::MassFlowRate, this->CondMassFlowRate);

if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) return;
if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) {
MyLoad = 0.0;
return;
}
}

// LOAD LOCAL VARIABLES FROM DATA STRUCTURE (for code readability)
Expand Down Expand Up @@ -7313,7 +7322,10 @@ namespace PlantChillers {
PlantUtilities::PullCompInterconnectTrigger(
state, this->CWPlantLoc, this->CondMassFlowIndex, this->CDPlantLoc, DataPlant::CriteriaType::MassFlowRate, this->CondMassFlowRate);

if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) return;
if (this->CondMassFlowRate < DataBranchAirLoopPlant::MassFlowTolerance) {
MyLoad = 0.0;
return;
}
}

// If FlowLock is True, the new resolved mdot is used to update Power, QEvap, Qcond, and
Expand Down
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