Re: [EnergyPlus_Support] Re: Passive gains breakdown

Window Transmitted Beam Solar = Window Transmitted Beam-to-Beam Solar + Window Transmitted Beam-to-Diffuse Solar

2011/7/15 <miguel@xxxxxxxxxxxxxx>

Marcus

General:
Window Heat Gain Energy
Window Heat Loss Energy

Diffuse you can start with Window Transmitted Diffuse Solar but it depends.

There are so many variables precisely to allow you to perform different analysis. It depends really on what you want to know. I understand how intimidating all these variables can be, but in the long term it is very rewarding to study the manuals.

Generally speaking if you are fine tuning the envelope I would use the variables starting with Window rather than Zone so you can check window by window.

But depending how you divide the zones of your building, its size and orientation, Zone variables might work fine. Or make no difference: example one window per zone.

Transmitance you set in materiala
Shadding the walls you can use shading building detailed.

Miguel Pacheco

Doutorando / Graduate Student
Laboratório de Eficiência Energética em Edificações - LabEEE
Universidade Federal de Santa Catarina - UFSC
http://www.labeee.ufsc.br

Contato/Contact:

Florianópolis: 55 48 3721 5184 / 55 48 3721 5185
São Paulo: 55 11 3091 2510
Celular: 55 48 88 43 91 65

Citando Marcus <clasz14@xxxxxxxxx>:

> Thanks for the comments, I will check indirect solar as well. However
> if anyone has the actual variable object names to use that would be a
> great help, there are so many variables that I'm not sure which ones
> to use!
>
> Cheers,
>
> Marcus
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, miguel@... wrote:
>>
>> Hello Marcus
>>
>> I would suggest you check also indirect solar gains through windows.
>> From my experience they are significant in cooling dominated
>> climates. Even in heating dominated climates, during their hot
>> season depending on the insulation of the building they can be
>> significant.
>>
>> I would also check the effects of radiant heat on roof and wall, by
>> choosing lower absorptivities AND shading walls.
>>
>> You can use zone window solar gain for solar gains through windows
>> but I would suggest you check window heat balance for a fine tune
>> of the envelope.
>>
>> district cooling does not gauge heat gains.
>>
>> Migue
>>
>> Citando Marcus <clasz14@...>:
>>
>> > I need to analyze the passive performance of a building in a cooling
>> > dominated climate. I need to meter the following passive heat gains:
>> >
>> > - Conduction through the envelope
>> > - Direct solar gain through windows
>> > - Infiltration gain
>> > - Total heat gain (to check the sum of these three)
>> >
>> > So far I've used the following approach, metering these variables:
>> >
>> > - Conduction through the envelope
>> > . ???
>> > - Direct solar gain through windows
>> > . Zone Transmitted Solar Energy (??)
>> > - Infiltration gain
>> > . Zone infiltration total heat gain
>> > - Total heat gain
>> > . Cooling:DistrictCooling ??
>> >
>> > This isn't producing quite what I expect - can someone direct me to
>> > more appropriate variables? Especially the conduction gain? Am I
>> > missing something?
>> >
>> > Cheers,
>> >
>> > Marcus
>> >
>> >
>>
>> Miguel Pacheco
>>
>> Doutorando / Graduate Student
>> Laboratório de Eficiência Energética em Edificações - LabEEE
>> Universidade Federal de Santa Catarina - UFSC
>> http://www.labeee.ufsc.br
>>
>> Contato/Contact:
>>
>> Florianópolis: 55 48 3721 5184 / 55 48 3721 5185
>> São Paulo: 55 11 3091 2510
>> Celular: 55 48 88 43 91 65
>>
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>>
>
>
>

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Re: [EnergyPlus_Support] Re: Passive gains breakdown - which variables?