Fan Power is 0 when Fan:OnOff is used to simulate a constant volume fan

[TiejunWu]

Issue overview

In the EnergyPlus example file (DOAToVRF.IDF), all VRF terminal units uses Fan:ConstantVolume object for terminal unit fan. When I changed TU1 terminal fan to Fan:Onoff type(DOAToVRF_FanOnOff.IDF), I used the following two objects for the fan power ratio and fan efficiency ratio curve. Supposedly the result should be the same as the original model. However, when the Fan:OnOff object is used, the resulting TU1 terminal fan power is always 0 value, even though there is air flow through the fan.

Details

Some additional details for this issue (if relevant):

• Platform (Windows 10)
• Version of EnergyPlus (Version 9.3)
• N/A

Checklist

Add to this list or remove from it as applicable. This is a simple templated set of guidelines.

• Defect file added (list location of defect file here)
  DOAToVRF_FanOnOff.IDF
  • Note jmarrec: Recreated the defect file at version 9.4, and placed it on EnergyPlusDevSupport.
• Ticket added to Pivotal for defect (development team task)
• Pull request created (the pull request will have additional tasks related to reviewing changes that fix this defect)