[Bldg-sim] Window performance with frames

[Alex Krickx]

Hi Otto,

Serious Materials provides full frame performance data here: http://index.seriouswindows.com/document-library/Datasheets/. I have also have some of our commercial packages modeled in curtainwall and storefront framing systems that I can provide upon request.

Firstly let me say that Window5 is a great tool - I use it often and love it. The only thing I would advise is that there can be a wide distribution in frame U-factors. The default U-factor for a thermally broken aluminum (TBA) frame in Window 5 is U-1.0. Using THERM and Window5 I've seen TBA frame U-factors vary from as low as 0.8 to as high as 1.5. The resultant full-frame U-factor using these 2 differing TBA frames (and the same glass package) is: 0.29 (R-3.4) for the poorer performing frame, and 0.22 (R-4.5) for the better frame.

I would say that putting either of those full frame u-factors in your energy model will yield pretty different results.

I think it's really important that we, as simulators and modelers, look at full-frame performance because this is the system that will be installed in the building. Center-of-Glass data can be useful comparing two different glass packages, but at the end of the day, it's a framed system that will be installed and a framed system that should be analyzed. My 2¢.

Regards,
Alex Krickx


Alex Krickx
Building Energy Specialist
[cid:image001.jpg at 01CB235C.7C6F3F60]
1250 Elko Dr, Sunnyvale, CA 94089
(t) 408.541.8124

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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Otto Schwieterman
Sent: Wednesday, July 14, 2010 1:10 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Window performance with frames

Does anyone know of a window manufacturer web site that has literature on its windows including the frame? I am using Trace 700 for EA Credit 1 and the reviewer asked for manufacturer data sheets for window performance values (U-value, VLT and SHGC) including the frame.

Your help is appreciated,

Otto


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