OpenStudio - Unitary System: Missing required property 'air_inlet/outlet_node_name'

asked 2023-08-01 08:31:59 -0500

Om's avatar

updated 2023-08-01 11:58:46 -0500


I am trying to model packaged single zone heat hump systems (System 4) per ASHRAE 90.1 Appendix G using OpenStudio. I use the "Unitary - DX Heat Pump (Two Speed cooling) - Cycling - Elec reheat" object from the library. It has been fine for the first two zones but then when I continue to do the same for the third zone onwards, I have got the following error.

Could anyone please advise why I start to get this error even though I use the same object and modeling method that do not give any error with the two previous zones?

Thank you.

Program Version,EnergyPlus, Version 23.1.0-87ed9199d4, YMD=2023.08.01 20:05,
** Severe  ** <root>[Coil:Cooling:DX:TwoSpeed][2 Spd DX Clg Coil 5] - Missing required property 'air_inlet_node_name'.
** Severe  ** <root>[Coil:Cooling:DX:TwoSpeed][2 Spd DX Clg Coil 5] - Missing required property 'air_outlet_node_name'.
**  Fatal  ** Errors occurred on processing input file. Preceding condition(s) cause termination.
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Just an update. I continue to work on the model which has about twenty zones applying the unitary system mentioned in my question. It turns out that there are only two out of twenty zones that encounter such errors. What would be possible root causes?

Om's avatar Om  ( 2023-08-01 09:02:32 -0500 )edit