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RE: [EnergyPlus_Support] cooling load
Rahul and Rohini you are right it may be the case.
but what i am confusing is, my building is a two story
(G+1) office building. when i see the results of the
simulation with and without insulation on the roof of
the upper floor of the building. the cooling load on
the ground zones decrease with insulation but for the
upper floor zones the cooling load increase with
insulation which seems an error.
another problem is on the window heat gain. does the
window heat gain directly sum up to the cooling load ?
if so in my report the window heat gain is greater
than the cooling load, why is this happens ?
--- Rahul Chillar <chillarrahul@xxxxxxxxx> wrote:
> Tek
> Since the building you are modelling is in a hot
> climate (equator) and there are no heating loads ,
> only airconditioning through out the year , The
> insulation would have negative effect. Infact your
> building would be heating up all day and will not be
> able to lose the heat due to insulation. This
> approach is suitable for cold climates. The
> explaination given by Rohini in email earlier
> justifies it well.
>
>
> Thanks
>
> Rahul Chillar
>
> Grad Research Assistant
>
> Building Systems Lab
>
> University of Illinois UC
>
>
>
> Rohini Brahme <rbrahme@xxxxxxxx> wrote:
> The reason could be that the heat from inside the
> building now has more difficulty in going out by
> conduction. This usually happens in office buildings
> which are dominated by internal loads and solar
> loads through windows. One way to check if this is
> true is to compare the internal temperatures without
> the system in the two cases. My guess is that the
> internal temperatures would be higher with
> insulation, and that these temperatures are higher
> than outside temperature on average. If you have
> enough air exchange with the outside (either by
> infiltration, or natural ventilation) then these
> numbers will be closer to the outside temperature.
> Also, make sure that the heating load is decreasing.
>
>
>
> Rohini
>
> -----Original Message-----
> From: teklay Weldeabzgi
> [mailto:teklay1979@xxxxxxxxx]
> Sent: Mon 7/5/2004 6:16 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Cc:
> Subject: [EnergyPlus_Support] cooling load
>
>
>
> when i simulate a ground plus one office
> building i
> gokt some confusing result due to insulation
> in the
> roofs. the roof in the upper floor is
> corregated iron
> sheet and a chip wood ceiling with an air
> space b/n
> them. when i see the annual cooling load for
> this base
> case and inserting an insulation just below
> the iron
> sheet the cooling load with insulation is
> greater than
> the cooling load with out insulation. but i
> doubt this
> result is correct b/c using insulation is to
> reduce
> the cooling load, but in my case it increases.
> can any one what will the possible reason. i
> have
> checked my idf file but i can't find any
> error.
>
> thanks
> tek
>
>
>
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> Thanks
> Rahul Chillar
> Grad Student
> Building Systems lab
> Univ Of Illinois Urbana Champaign
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