PsyRhoAirFnPbTdbW: RhoAir (Density of Air) is calculated <= 0

asked 2015-10-22 18:08:01 -0500

NasimMirian's avatar

updated 2015-10-23 04:14:25 -0500

I am trying to model an office building with different type of HVAC systems. some of the zones are serving by 2 HVAC system. I believe that till now the system modeling is fine. But I keep getting this error message that I don't know how to fix. It seems that one of the zones is too cold.

What is the cause for this error?

PsyRhoAirFnPbTdbW: RhoAir (Density of Air) is calculated <= 0 [-5.22382]
pb =[100487.00], tdb=[-340.17], w=[1.0000000E-005].
   **   ~~~   **  Routine=CorrectZoneHumRat, During Warmup, Environment=INCH'ON ANN CLG 1% CONDNS DB=>MWB, at Simulation time=08/21 12:10 - 12:20
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Do you hard size the system or use autosize? EnergyPlus can't autosize if you have multiple system controlling the same room.

Yixing Chen's avatar Yixing Chen  ( 2015-10-22 23:40:19 -0500 )edit

Did you look at this thread?

Chandan Sharma's avatar Chandan Sharma  ( 2015-10-27 07:30:06 -0500 )edit