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[EnergyPlus_Support] Re: Indoor air temperature LOWER than ambient temperature

Hi Ryan

Could this not simply be the effect of the thermal mass of the building? If the thermal mass of the building has been cooled by night purging you would expect the indoor temperature to be lower than ambient temperature during the day. 

It would be strange for indoor air temperature to be less than ambient temperature during the night but is certainly not impossible.


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "academicryan" <azianzheep@...> wrote:
> Hi 
> I've been doing E+ simulation for over half a year now and feel like I have a good grasp of it. But one thing I can't figure out is why I sometimes get results of indoor temperature being lower than ambient temperature. This often occurs during the early morning, 3am-9am. In reality this is impossible so I'm very confused by this result. 
> Can someone please explain to me why E+ produces this result? 
> If requested, I can attach additional information such as .idf or excel graph.
> Many thanks,
> Ryan


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