HW Preheat coil in HVACTemplate:System:VAV causing crash

asked 2018-07-06 11:10:27 -0600

Abarker gravatar image

updated 2018-07-07 10:37:45 -0600

Im trying to set up about 8 VAV systems using the HVAC template objects. EnergyPlus is either crashing or terminating prior to the simulation starting when I specify a Hot Water preheat coil in these objects with a 15C setpoint.

This is the only difference between a running and non-running model. I do have the required boiler and hot water loop template objects with plenty of other coils requiring them. The boiler capacity is autosized.

It does not crash when I specify an electric coil (it does still crash when I modify the setpoint e.g. to the default 7.2 C), leading me to believe this might have to do with the boiler capacity and or hot water loop configuration. What would cause this though? Model was running fine before this change.

Any thoughts are appreciated.


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I tried to reproduce this starting with the HVACTemplate-5ZoneVAVWaterCooled example file. Added a HW preheat coil, first with blank (default) temperature setpoint, then with 7.2C, then with 15C, and all ran fine. So I'll need your idf files (preferably one that runs OK and one that fails) in order to diagnose. Please post a link here or send to energyplus-support@gard.com

MJWitte gravatar image MJWitte  ( 2018-07-10 08:09:07 -0600 )edit

Commenting to say that I was able to rectify this situation by modifying the preheat coil temperature set-point of the systems. I don't seem to have a file which doesn't run any longer, and... cant seem to recreate one either. Chalk it up to poor file management on my part. However, I am guessing this a local issue or some odd scenario I stumbled in and out of without realizing. Thanks for the help.

Abarker gravatar image Abarker  ( 2018-07-23 14:22:15 -0600 )edit