"Cooling load was calculated less than zero" error

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jmadz
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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?
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truckee zero cooling load.JPG
truckee zero cooling load.JPG (34.41 KiB) Viewed 1181 times

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