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[EnergyPlus_Support] Re: Insulating the roof
I had already specified the climate.
Still, I apologize.
I have found what I think is the cause of the discrepancy: the effect
of insulating depends almost only in the difference of inside and
outside surface temperature ("¿sun-air temperature?"). So, there is
only effect (in energy consumption, not in temperatures) if there is
an HVAC working and depens much on what setpoint temperature is set,
which I'll try to verify asking for "sun-air temperature" (I don't
know if it it called so in english) in E+, can it be asked for to DB?
Carlos
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...>
wrote:
>
> Actually, what you really got as an answer in the
> Designbuilder forum does not match what you say below...
>
> "Depending on the other materials used in the
> building, the weather file etc. you may find
> there is little or no difference based on the
> insulation installed in the roof.
>
> My experience has included several buildings of
> this type, where, depending on climate, the
> temperature and energy consumption of HVAC are
> more or less entirely driven by internal gains.
> Insulating the walls, even with (riduculously)
> huge amounts of insulation makes little if any difference.
>
> What are the parameters of your simulation? Would
> you care to post the simulation in order to have someone take a
look at it? "
>
> The answer is perfectly correct -- there can be
> buildings that are entirely driven by internal
> gains and insulation may not help -- may actually hurt.
>
> If you care to share your input file with either
> the DB forum or us, we can help you figure out the discrepancies.
>
>
> At 08:13 AM 6/24/2008, Daniel Solís wrote:
> >I simulated a house with DesignBuilder in a very hot and dry
climate.
> >I insuated the roof with EPS polyestyrene. No matter how much
> >insulation I used, the results were almost the same.
> >
> >In DB forum I got the answer that no matter the climate, the
> >temperature and HVAC consuption is entirely driven by internal gain
> >and so there is no difference insulating the roof.
>
>
> Linda
>
> EnergyPlus WebSite: http://www.energyplus.gov
> Owner: EnergyPlus_Support list
> Member: EnergyPlus Development Team
>
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