"Cooling load was calculated less than zero" error

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Joined: Mon Jun 18, 2018 10:05 am -1100

"Cooling load was calculated less than zero" error

Post by jmadz » Mon Jun 18, 2018 10:20 am -1100

Hi everyone,

My model outputted results that met PHIUS+ 2015 however, displayed an error "Cooling load was calculated less than zero". However, there was a annual cooling demand outputted (0.1kBTU/ft2yr)

The climate is Truckee, CA (ASHRAE CZ 6). If I change the weather file to say Jacksonville Florida, a cooling load is calculated.

Screenshot of Truckee CA is attached.

A couple of things I tried is modifying the envelope (modify transmission gains) and varied ventilation losses (air tightness) but it didn't help.

Any ideas would be much appreciated!!

Update: putting the natural ventilation to 0ACH resulted in a cooling load of 0.88, would that mean that natural ventilation is sufficient to cool the home thus no cooling load determined?
truckee zero cooling load.JPG
truckee zero cooling load.JPG (34.41 KiB) Viewed 1181 times

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