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Cooling Tower Design Inlet Air Wet-Blub temperature is 25 C in idf however is 0C in eplustbl.htm #10889

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antonpsd opened this issue Jan 3, 2025 · 1 comment · May be fixed by #10900
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Cooling Tower Design Inlet Air Wet-Blub temperature is 25 C in idf however is 0C in eplustbl.htm #10889

antonpsd opened this issue Jan 3, 2025 · 1 comment · May be fixed by #10900
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@jmarrec
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Defect Includes code to repair a defect in EnergyPlus

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antonpsd commented Jan 3, 2025

Cooling Tower Design Inlet Air Wet-Blub temperature is 25 C in idf however is 0C in eplustbl.htm

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Some additional details for this issue (if relevant):

  • Platform: Windows
  • Version of EnergyPlus: 24.2

.idf and eplustbl.htl are attached.
files.zip
@jmarrec jmarrec added the Defect Includes code to repair a defect in EnergyPlus label Jan 20, 2025
@jmarrec jmarrec self-assigned this Jan 20, 2025
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jmarrec commented Jan 20, 2025

Leaving Water Setpoint Temperature is also 0.00 here, which is not right either.

The water flow rate showing as 0 is because precision is 2 digits, and your CT is sized to 0.004019 m3/s (or 60 Gal/min), which perhaps seems unusually low (?). Not sure whether the precision should be increased or not.
I'd tend to think that for Water flow rates in m3/s, we should settle on a precision of 6 sig digits.

jmarrec added a commit that referenced this issue Jan 20, 2025
@jmarrec
Add a test for #10889
759cb04 
```
[ RUN      ] EnergyPlusFixture.CondenserLoopTowers_VSCoolingTower_OutputReport
/home/julien/Software/Others/EnergyPlus2/tst/EnergyPlus/unit/CondenserLoopTowers.unit.cc:4925: Failure
Expected equality of these values:
  expectedDesOutletWaterTemp
    Which is: 27.84
  VSTower.DesOutletWaterTemp
    Which is: 0
/home/julien/Software/Others/EnergyPlus2/tst/EnergyPlus/unit/CondenserLoopTowers.unit.cc:4926: Failure
Expected equality of these values:
  expectedDesInletWaterTemp
    Which is: 33.98
  VSTower.DesInletWaterTemp
    Which is: 0
/home/julien/Software/Others/EnergyPlus2/tst/EnergyPlus/unit/CondenserLoopTowers.unit.cc:4952: Failure
Expected equality of these values:
  fmt::format("{:.2f}", expectedDesignInletWB)
    Which is: "23.28"
  OutputReportPredefined::RetrievePreDefTableEntry(*state, orp.pdchCTFCDesInletAirWBT, TowerName)
    Which is: "0.00"
/home/julien/Software/Others/EnergyPlus2/tst/EnergyPlus/unit/CondenserLoopTowers.unit.cc:4955: Failure
Expected equality of these values:
  fmt::format("{:.2f}", expectedDesOutletWaterTemp)
    Which is: "27.84"
  OutputReportPredefined::RetrievePreDefTableEntry(*state, orp.pdchCTFCLevWaterSPTemp, TowerName)
    Which is: "0.00"
```
@jmarrec jmarrec linked a pull request Jan 21, 2025 that will close this issue
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