Default minimum outdoor temperature for DX coils

asked 2019-07-24 16:27:46 -0500

khaddad
95 ●4

updated 2019-07-28 11:57:20 -0500

The current minimum outdoor temperature for compressor operation for EnergyPlus objects 'Coil:Heating:DX:VariableSpeed' and 'AirConditioner:VariableRefrigerantFlow' is -20 DegC. The current cold-climate heat pump technology can operate easily down to -25 DegC. Ideally if this temperature can be allowed to drop to -30 DegC.

What is the best way to request this kind of change in EnergyPlus? This is really not a feature request. It's more of minor code change. Is there a web link someone can share for entering this request for change in e+?

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See https://github.com/NREL/EnergyPlus/pu... and https://github.com/NREL/EnergyPlus/pu... for similar changes to EnergyPlus.

shorowit ( 2019-07-30 15:55:35 -0500 )edit

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answered 2019-08-01 13:32:36 -0500

khaddad
95 ●4

After doing further testing with e+ 8.9, it turns out that the dx heating coil (Coil:Heating:DX:SingleSpeed) can actually operate below -20 DegC. The limitation is then not in e+. My original testing for this was done using OpenStudio which always sets a minimum value of -20 DegC on the the minimum outdoor temperature for compressor operation. This was last verified with OS v 2.6.