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

[Vikram Sami]

Actually - when you install eQUEST it should put an XL file in your
\eQUEST\Window folder titled eQUEST-DOE2 Glass Library.xls

 

This has the DOE2 glass types sorted by SHGC and U-Value. Under U-value
there are numbers for COG, as well as assembly U-Values. 

 

Of course ultimately it depends on the size of the glass lite. For
example if you have a 10' x 10' opening, and you break it into 3 rows
and 3 columns, your U value will be higher than if you break it into 2
rows and one column.

 

 

 

Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE
1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361 
Responsive Design * Technological Expertise * Exceptional Service 
Please visit our new website | www.lordaecksargent.com
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P Think GREEN before you print.

 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Srikar
Kaligotla
Sent: Monday, September 22, 2008 1:35 PM
To: 'Josh Greenfield'; bldg-sim at lists.onebuilding.org;
equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Glass center-of-glass to assembly U-Value?

 

Josh,

You could probably use ASHRAE fundamentals Handbook to get the assembly
U-values. Go to Fenestration (or 29th Chapter) and look for Table 5
(U-factors for Various Fenestration products) this is from an older
version. 

Regards 

Srikar R Kaligotla 
Design Engineer
HVAC Dept. 

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Josh
Greenfield
Sent: Monday, September 22, 2008 12:07 PM
To: bldg-sim at lists.onebuilding.org; equest-users at lists.onebuilding.org
Subject: [Equest-users] Glass center-of-glass to assembly U-Value?

 

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> 

Be Green...please consider the environment before printing this email.

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