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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@xxxxxxx Prof. Emeritus of Architecture Ph./Fax: 1-979-696-2506 Texas A&M University =====================================
-----Original Message----- From: BLDG-SIM@xxxxxxxx To: BLDG-SIM@xxxxxxxx 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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