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It depends on the code in use. I submitted an official request (CM
proposal) to the ASHRAE 90.1 Envelope committee to change the definition to
only include the above grade walls but they declined it so it is still the
above and below grade walls. The reason I sent the request is that architects
tend to add more glazing to the above grade walls because they can include the
below grade walls in the definition. I showed some modeling results of the
difference between a two story building with one above and below grade wall in
a few difference cities in the However, I believe the IECC includes only
the above grade walls. Renée Renée Azerbegi, CEM, LEED-AP President/Sustainable Design Engineer ambient energy – solar & sustainable design solutions t 303.278.1532 | f 303.278.8533 | c 303.885.2695 renee@xxxxxxxxxxxxx ambient-e.com From:
BLDG-SIM@xxxxxxxx [mailto:BLDG-SIM@xxxxxxxx] On
Behalf Of 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@xxxxxxx Prof. Emeritus of
Architecture Ph./Fax: 1-979-696-2506 ===================================== -----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 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has
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