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Re: [EnergyPlus_Support] Re: Indoor air temperature LOWER than ambient temperature
Night radiation ?
On 8/17/2012 8:34 AM, academicryan wrote:
> Hi Josh,
>
> thanks for your input. You are right that in some situations, the outdoor temperature can rise faster than the indoor temperature due to thermal mass.
>
> However, what I'm talking about is the indoor temperature reducing lower than the lowest night time temperature. To me this shouldn't be possible.
>
> Please look at "glass_house.xlsx" in the files section of Yahoo Groups to see what I mean. The excel graph is simulation of a glass house rather than a regular building, nevertheless this phenomenon has occurred for normal houses as well.
>
> Thanks,
>
> Ryan
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "cia08jss" <cia08jss@...> wrote:
>>
>>
>> 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.
>>
>>
>> Josh
>>
>> --- 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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