PsyRhoAirFnPbTdbW: RhoAir (Density of Air) is calculated <= 0 [-8.48360E-019]

asked 2016-10-18 20:18:29 -0500

PM
101 ●1 ●2

updated 2016-10-19 11:37:15 -0500

Hello, I'm having a problem with my OS model that has zone WSHP. See attached photo below. When I ran the model, I received this error message below and I don't know to fix it. * Severe * PsyRhoAirFnPbTdbW: RhoAir (Density of Air) is calculated <= 0 [-8.48360E-019]. * ~~~ * pb =[93779.00], tdb=[-2.44E+020], w=[0.3583424]. * ~~~ * Routine=Unknown, * Fatal * Program terminates due to preceding condition. ...Summary of Errors that led to program termination: ..... Reference severe error count=11 ..... Last severe error=PsyRhoAirFnPbTdbW: RhoAir (Density of Air) is calculated <= 0 [-8.48360E-019].C:\fakepath\2016-10-18 18_20_01-Proposed_Start_20161018.osm.png

Any help would be greatly appreciated. Thank you. PM

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Thank you. Both links were very helpful. I have multiple systems (WSHP and Ductless split HP system) control in one thermal zone (THZ). I also suspected that the staircase THZ runs from the 1st floor thru 21st floor that has no HVAC system in this zone causing the problem. I added the unit heater in this zone and it works fine now. Thanks again for the hints.

PM ( 2016-10-23 00:02:16 -0500 )edit

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