[Bldg-sim] Glass center-of-glass to assembly U-Value?

[Josh Greenfield]

Does anyone have any rules of thumb on a quick/easy approximation for
taking a Center-of-Glass U-value and converting it to an Assembly
U-value based on industry standard assembly constructions?  I know this
depends on a lot of variables, like frame material and conductance, and
the size of the overall glass assembly, etc., but I'm just looking for a
quick estimate on performance reduction for comparisons to other window
types for a particular building.

 

Also, is there an ASHRAE 90.1-2004 Baseline glass Visible Light
Transmittance (VLT)?

 

Josh Greenfield, PE, LEED AP
Senior Associate
Primera Engineers, Ltd.
100 S. Wacker Drive, Suite 700
Chicago, IL 60606
312.606.0910 Main
312.242.6392 Direct
312.606.0415 Fax
jgreenfield at primerachicago.com
<blocked::mailto:jgreenfield at primerachicago.com> 
http://www.primerachicago.com <http://www.primerachicago.com> 

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