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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
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2 changes: 2 additions & 0 deletions src/EnergyPlus/ChillerElectricEIR.cc
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Original file line number Diff line number Diff line change
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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