Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

Default minimum outdoor temperature for DX coils

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

khaddad's avatar

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+?

edit retag flag offensive close merge delete


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

2 Answers

Sort by ยป oldest newest most voted

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

khaddad's avatar

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.

edit flag offensive delete link more

answered 2019-07-29 21:22:16 -0500


  1. Open an issue for the developers on GitHub, or
  2. Send a ticket to the developers through the Help Desk
edit flag offensive delete link more


Thanks, this is exactly what I was looking for.

khaddad's avatar khaddad  ( 2019-07-30 13:25:45 -0500 )edit

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Question Tools

1 follower


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

Seen: 1,101 times

Last updated: Aug 01 '19