Hello,
I am working on a model that has a fatal error that I am having trouble getting rid of. The error looks like this: PsyRhoAirFnPbTdbW: RhoAir (Density of Air) is calculated <= 0 [-2.17716]
Essentially I think the program is doing a psychometric analysis and calculating a negative air density, which is obviously wrong. Someone using designbuilder had this error and the suggested solution was that the air temperature distribution needed to be changed from "Dynamic Gradient" to "Mixed". Since I searched my IDF for "dynamic" and it was not in my project, I don't believe this is my issue. To give a little more background this error occurs after the model has completed zone sizing, but before the model completes system sizing. This error occurred after I added a unit heater into the model.
Any help would be appreciated!
Alisa
