[Bldg-sim] ASHRAE 90.1 Window to Wall area definition

Cheryl M. Saldanha CMSaldanha at sgh.com
Thu Oct 15 10:37:57 PDT 2015


ASHRAE interpretation IC 90.1-2004-1 dated June 25, 2005 states that gross wall area is “the area of the wall measured from the exterior face from the top of the floor to the bottom of the roof”.

It goes on to say that buildings with conditioned below-grade space, the gross wall area includes below-grade space.

Cheryl M. Saldanha, P.E. (CA)
Senior Staff I - Building Technology
SIMPSON GUMPERTZ & HEGER
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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Rosenberg, Michael I
Sent: Thursday, October 15, 2015 1:34 PM
To: David Eldridge <DEldridge at grummanbutkus.com>; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] ASHRAE 90.1 Window to Wall area definition

David is correct regarding prescriptive compliance with Section 4 in 90.1. However, 2010 Appendix G in table G3.1.5 clearly states that baseline WWR is limited to 40% of “gross above grade wall area”. This is an important distinction.
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Michael Rosenberg, CEM, LEED AP
Senior Research Scientist
ENERGY & ENVIRONMENT DIRECTORATE

Pacific Northwest National Laboratory
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michael.rosenberg at pnnl.gov<mailto:michael.rosenberg at pnl.gov>
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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of David Eldridge
Sent: Thursday, October 15, 2015 10:27 AM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: Re: [Bldg-sim] ASHRAE 90.1 Window to Wall area definition

Example 5-Q in the 90.1-2013 User’s Manual still uses both above-grade and below-grade walls as “exterior walls” for determining gross wall area.

David



David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP
Grumman/Butkus Associates



From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher
Sent: Thursday, October 15, 2015 12:15 PM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] ASHRAE 90.1 Window to Wall area definition

I know this question has been asked before but I could not find a related thread.

90.1 states that the WWR is based on the gross wall area and the definition of gross wall area includes below ground walls as well as above ground walls..  Including the below grade walls can make a significant difference in the WWR for typical urban high rise buildings with a number of below grade parking floors.

Can someone confirm that the WWR calculation is based on above grade wall area plus below grade wall area?


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Christopher Jones, P.Eng.
Senior Engineer

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