[Bldg-sim] ASHRAE 90.1-2007 Fenestration Areas

[Will Mak]

Oh! There was the problem... I was looking at the 90.1 2004 User's Manual!

 

So as long as we proportionally reduce windows to bring the overall building glazing percentage to 40%, I should be good?

 

William Mak, LEED Green Associate
Mechanical Design Engineer

EPSTEIN
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From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Cheney
Sent: Wednesday, December 22, 2010 5:04 PM
To: Jason Glazer
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] ASHRAE 90.1-2007 Fenestration Areas

 

Carol and Jason tend to buy the idea of proportionally reduce the windows. Well, Yes and No. It very much depends on which standard, 2004 or 2007, you are going to use. 

 

What Will quoted is from 90.1-2004 (User Manual), so I answered accordingly in my last email. The proof can be found at Page G-16, Example G-D-Baseline Building Model, Building Envelope. 

>From the answer, it says: " ...The baseline building window area is distributed equally on each facade in horizontal bands. This means that some rooms that do not have windows in the proposed building will have windows in the baseline building. Since daylighting is not modeled in the baseline building, the position of the band of glass above the floor is not relevant...." 

 

In 2007, however, it says: " ...The baseline building has each window (including glass doors) area reduced proportionally by a factor of 67% (40%/60%=67%) from the proposed building. ..." 

 

Does it answer your question, Will? 

 

Regards, 

 

Cheney

 

LinkedIN @ http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b <http://ca.linkedin.com/pub/yu-cheney-chen/27/637/72b>  

 

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