[BLDG-SIM]

[Larry Degelman]

Gerald et al,

 

The conventional definition of window-wall-ratio is the window area divided
by the "gross" wall area, though the term "window-wall-ratio" is no longer
among the Definitions section of 90.1-2004.  For that matter, WWR is not
defined in the Abbreviations section.

 

Notwithstanding all that, the definition for "Gross Wall Area" is clearly
defined in the 90.1-2004 User's Manual.

 

On page 5-30, example 5-G addresses "Determining Gross Wall Area", stating
that this is very significant since the window area requirements are based
on Window-Wall-Ratio (WWR).  

 

Answer (as shown on the same page):  "The gross wall area includes both
above-grade walls and below-grade walls so that gross wall area is simply
the perimeter of the building . times the height."

 

Larry D.

===================================== 

Larry O. Degelman, P.E.                  ldegelman at cox.net 

Prof. Emeritus of Architecture    Ph./Fax: 1-979-696-2506

Texas A&M University

=====================================

 

-----Original Message-----

From: BLDG-SIM at gard.com

To: BLDG-SIM at gard.com

Sent: Fri Apr 21 09:06:56 2006

Subject: [BLDG-SIM] ASHRAE 90.1 window-wall ratio

 

I recently came across a paper from "Building Energy

Codes Program" called "Setting the Standard" and lists

out various new code updates. It seems that currently

we are allowed to count below-grade walls as part of

the window-wall ratio calculations.  Does anyone have

an update on this or point me to the right resource to

confirm this information?

 

Thanks.

Gerald

 

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