[Bldg-sim] Fwd: insulation film on windows in EnergyPlus

[Paul Carey]

Jeong, Marcus, et al

That does of course assume you can get the properties of the window film from the manufacturer, which for new films can be easier said than done. The other issue is that many providers of the product ( not necessarily the manufacturers here) provide information for the film having been tested applied to a clear float glass and sometimes even for entire units, so it can be sometimes difficult to get the actual performance data of the film.

Shading coefficient is a quick way of including shades, etc in some other programs still use rather than the way EnergyPlus takes everything back to first principles calculations. Could still be useful if you are looking at say "living wall" features for example without having to go into the complexity of using a "shading" block or surface with a scheduled transmissivity.

Regards
Paul





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----- Reply message -----
From: "Marcus" <jones.0bj3 at gmail.com>
Date: Tue, Jul 12, 2011 10:06
Subject: [Bldg-sim] Fwd:  insulation film on windows in EnergyPlus
To: 
Cc: <bldg-sim at lists.onebuilding.org>


I don't think a WindowMaterial:Shade will properly account for the film, I
would instead look into creating your window in the software WINDOW from
LBL. This software can model detailed layer-by-layer windows with frames and
full spectral data, which can then be exported into EnergyPlus.

http://windows.lbl.gov/software/window/window.html

Good luck and I hope you let us know your solution!

P.S. EnergyPlus talks about the SHGC or g-Value of windows, not shading
coefficients. You can convert between them.

Marcus
-- 
Marcus Jones, LEED AP, M.Sc.
*Freelance energy consultant*
*Vienna, Austria*



2011/7/11 윤정훈 <superfig at hotmail.com>

>  Hello,
>
> I'm running simulation wih EnergyPlus.
> In order to apply ECMs, I'm trying to apply insulation films to each
> window.
> The object I used is *WindowMaterial:Shade*, but I don't think my way is
> correct.
> I have limited information (Available data include solar reflectance,
> visible reflectance/transmittance, and shading coefficient),
> which is further complicating the situation.
>
> Any help will be much appreciated.
> Thank you.
>
>
> _Jeong
>
> p.s. BTW, I do not understand why there's no shading coefficient field in
> window-related objects.
>
>
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-- 
Marcus Jones, LEED AP, M.Sc.
*Freelance energy consultant*
*Vienna, Austria*
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