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fix VRFFluidTCtrl OU Fan Power not considering system cycling #10650

Merged
merged 5 commits into from
Sep 12, 2024
Merged

fix VRFFluidTCtrl OU Fan Power not considering system cycling #10650

merged 5 commits into from
Sep 12, 2024

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yujiex
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@yujiex yujiex commented Aug 8, 2024 •
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Pull request overview

Regression diffs

Regression diffs occur in the following two files:

  • VariableRefrigerantFlow_FluidTCtrl_5Zone
  • VariableRefrigerantFlow_FluidTCtrl_HR_5Zone

eplusout.csv diff

The diffs in eplusout.csv in the following variables.

  • VRF HEAT PUMP:VRF Heat Pump Cooling Electricity Rate,
  • VRF HEAT PUMP:VRF Heat Pump Cooling Electricity Energy,
  • VRF HEAT PUMP:VRF Heat Pump Heating Electricity Rate,
  • VRF HEAT PUMP:VRF Heat Pump Heating Electricity Energy,
  • Cooling:Electricity,

VRF Heat Pump Cooling and Heating Electricity Rate and Energy differences are due to outdoor unit fan power changes in this feature (``this->ElecCoolingPower = state.dataHVACVarRefFlow->VRF(VRFCond).Ncomp + this->OUFanPower;`).
Cooling:Electricity is affected by VRF Heat Pump Cooling/Heating Electricity, so the diffs are also expected.

meter diff

The following variables have meter diffs. These are expected as OU fan power is part of cooling, HVAC, and facility electricity. So these diffs are also expected.

  • Cooling:Electricity
  • Electricity:Facility
  • Electricity:HVAC

table diff

The following electricity terms have diffs. The Electricity:Facility, Electricity:HVAC, Heating:Electricity terms are due to reasons discussed above in meter and eplusout csv diffs. The ElectricityPurchased are also dependent on the electricity demand, which includes facility and HVAC electricity demand. These are affected by OU fan power as well. So diffs in *ElectricityPurchased is also expected.

  • Electricity:Facility
  • ElectricityPurchased:Facility
  • ElectricityPurchased:Plant
  • Cogeneration:ElectricityPurchased
  • General:Cogeneration:ElectricityPurchased
  • ElectricityNet:Facility
  • ElectricityNet:Plant
  • Cogeneration:ElectricityNet
  • General:Cogeneration:ElectricityNet
  • Electricity:HVAC
  • Heating:Electricity
  • General:Heating:Electricity
     
    NOTE: ENHANCEMENTS MUST FOLLOW A SUBMISSION PROCESS INCLUDING A FEATURE PROPOSAL AND DESIGN DOCUMENT PRIOR TO SUBMITTING CODE

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  • If any diffs are expected, author must demonstrate they are justified using plots and descriptions
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  • Perform a Code Review on GitHub
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@yujiex yujiex added the Defect Includes code to repair a defect in EnergyPlus label Aug 8, 2024
@yujiex yujiex added this to the EnergyPlus 24.2 milestone Aug 8, 2024
@yujiex yujiex self-assigned this Aug 8, 2024
rraustad
rraustad reviewed Aug 27, 2024
View reviewed changes
src/EnergyPlus/HVACVariableRefrigerantFlow.cc
@@ -11736,7 +11736,7 @@ void VRFCondenserEquipment::CalcVRFCondenser_FluidTCtrl(EnergyPlusData &state)
// Key outputs of this subroutine
this->CompActSpeed = max(CompSpdActual, 0.0);
this->Ncomp = max(Ncomp, 0.0) / this->EffCompInverter;
this->OUFanPower = this->RatedOUFanPower;
this->OUFanPower = this->RatedOUFanPower * CyclingRatio;
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This seems like a reasonable change IF the system uses cycling fan. For constant fan I don't think you want to do this.

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Oh, wait. this is the outdoor unit fan. Yes, I think this is reasonable that the entire system would cycle when below min part load ratio.

@dareumnam dareumnam self-requested a review August 28, 2024 17:49
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This is a side PR related to #10341, and it aligns with the changes we made in #10341. The test diffs are expected, and there are no conflicts with the develop branch. I believe this is good to go. @Myoldmopar

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This is now causing a unit test failure in develop, at least locally. I'm going to push the branch up and let CI confirm. FWIW, I'm seeing the issue with the assertion that these two are equal-ish:

state->dataHVACVarRefFlow->VRF(1).OUFanPower
state->dataHVACVarRefFlow->VRF(1).RatedOUFanPower

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yujiex commented Sep 11, 2024

I will check the unit test

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⚠️ Regressions detected on macos-14 for commit fa3f782

Regression Summary
  • ESO Big Diffs: 3
  • Table Big Diffs: 4
  • MTR Small Diffs: 1
  • MTR Big Diffs: 1
  • Table String Diffs: 1

@Myoldmopar
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OK, CI confirmed my results, the unit test is failing here as seen here: https://github.com/NREL/EnergyPlus/actions/runs/10814479373/job/30001042106

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yujiex commented Sep 11, 2024

OK, CI confirmed my results, the unit test is failing here as seen here: https://github.com/NREL/EnergyPlus/actions/runs/10814479373/job/30001042106

@Myoldmopar I just fixed it. Need to multiply by cycling ratio in unit test too.

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⚠️ Regressions detected on macos-14 for commit ff1fe4a

Regression Summary
  • ESO Small Diffs: 8
  • EDD: 2
  • MTR Small Diffs: 10
  • Table Big Diffs: 8
  • Table String Diffs: 5
  • ERR: 2
  • ESO Big Diffs: 4
  • EIO: 6
  • Table Small Diffs: 6
  • MTR Big Diffs: 1

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Yep, that was it! More diffs appearing, but obviously not because you changed one line in a unit test :) It was behind develop and develop was moving way too fast. Anyway, this is good to go, will merge it in later when CI calms down a bit. Thanks!

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yujiex commented Sep 11, 2024

Thanks @Myoldmopar. Glad it resolved :)

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OK, got the branch pulled and merged develop. It's all happy now. Thanks @yujiex !

@Myoldmopar Myoldmopar merged commit 6ebeecd into develop Sep 12, 2024
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@Myoldmopar Myoldmopar deleted the fixVRFOUfanCycling branch September 12, 2024 16:36
@mjwitte mjwitte mentioned this pull request Oct 2, 2024
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@rraustad rraustad rraustad left review comments

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@mjwitte mjwitte Awaiting requested review from mjwitte

@dareumnam dareumnam Awaiting requested review from dareumnam

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Defect Includes code to repair a defect in EnergyPlus
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EnergyPlus 24.2
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Successfully merging this pull request may close these issues.

VRF Cooling issue: Heat Pump outdoor unit fan power does not consider runtime fraction
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