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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I don't think I agree with this advice<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Under ASHRAE 90.1-2007, Section 5.2.1, part of the requirements for the PRESCRIPTIVE method requires that "the vertical fenestration area does not exceed 40% of the gross wall area for each <b><i>space-conditioning category</i></b>". <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The definition for "space conditioning category" simply says:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> non-residential conditioned space,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> residential conditioned space, and<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> nonresidential and residential semiheated space<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It doesn't list unconditioned space. Now I know this info is listed in the prescriptive requirements, but if it was my model, and I had a garage that had 100% window area, there is no way I would count that towards the gross WWR, particularly if I was applying for LEED, and these inconsequential windows pushed my WWR above 40% and thus penalized my proposed building. In fact, I might not even model the windows, unless I felt they were going to superheat the garage and start impacting adjacent space cooling loads.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Just my opinion...<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:teal'>GHT Limited<br></span></b><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'>James Hansen, P.E., LEED AP</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br>Senior Associate<br>1010 N. Glebe Road, Suite 200<br>Arlington, VA 22201-4749<br>703-243-1200 (office)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>703-338-5754 (cell)<br>703-276-1376 (fax)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><a href="http://www.ghtltd.com/" title="http://www.ghtltd.com/">www.ghtltd.com</a></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>PKConsulting<br><b>Sent:</b> Wednesday, October 19, 2011 4:04 PM<br><b>To:</b> deepika khowal<br><b>Cc:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] wwr calculation<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>It doesn't change for unconditioned or conditioned. It is only a function of gross wall area (ft2) and window area (ft2). Don't think too hard about this. You are looking for a needle in the wrong haystack. This one is straight forward with no tricks...<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>WWR is for whole bldg not space by space.<o:p></o:p></p></div><div><p class=MsoNormal><br>Pashalu<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><br>On Oct 19, 2011, at 12:20 PM, deepika khowal <<a href="mailto:deepika.khowal@gmail.com">deepika.khowal@gmail.com</a>> wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>Thanks Pasha<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>yes , i have been using LV-d report.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Am confused how it work for an unconditioned space.<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Thanks<o:p></o:p></p><div><p class=MsoNormal>On Wed, Oct 19, 2011 at 11:01 AM, PKConsulting <<a href="mailto:pasha.pkconsulting@gmail.com">pasha.pkconsulting@gmail.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal>It should be the gross wall area for everything above ground. Use the lv-d report to find the numbers to calculate the overall WWR for your entire bldg. There is a summary page at the end of the lv-d report. Look for the line called-'all walls'. You can use those numbers to calc WWR percentage.<br><br>Pashalu<o:p></o:p></p><div><div><p class=MsoNormal><br>On Oct 19, 2011, at 11:39 AM, deepika khowal <<a href="mailto:deepika.khowal@gmail.com">deepika.khowal@gmail.com</a>> wrote:<br><br>> Hi all<br>><br>> I have a question about calculating WWR.<br>> for example, if the south wall area is 700sf and total window area is 70sf then the WWR should be 10%.<br>> but if 50% of south wall is part of a garage and is unconditioned, then in calculating WWR , should I include only the wall area for conditioned space or it should include complete facade?<br>> Thanks<br>><br>> Deepika<br>><br>><br>><br>><o:p></o:p></p></div></div><p class=MsoNormal>> <image.png><br>> _______________________________________________<br>> Equest-users mailing list<br>> <a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>> To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></blockquote></div><P align=left><FONT size=2><FONT face=Tahoma><FONT color=#0000ff>
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