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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dirk,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I had to deal with this question a few
months ago. The LEED NC 2.2 manual for EA Prerequisite 2 has <b><i><span
style='font-weight:bold;font-style:italic'>two</span></i></b> options for
complying with the second requirement. You could meet the prescriptive
requirements (Sections 5.5, etc.) <b><i><u><span style='font-weight:bold;
font-style:italic'>OR</span></u></i></b> meet the performance requirements (Section
11) of ASHRAE 90.1-2004. If you can’t meet the prescriptive requirements
(like 50% window-to-wall ratio), then the Section 11 model is an option. Note
that this model is different than the model for Credit 1, which uses Appendix
G. The window-to-wall ratio is limited to 50% for the baseline building in the
Section 11 model and limited to 40% for the baseline building in the Appendix G
model. The proposed building would have the actual windows in both models.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Calibri><span style='font-size:
11.0pt;color:navy'>Sincerely,<br>
<br>
<st1:PersonName w:st="on">Keith Swartz</st1:PersonName>, PE, LEED® AP<br>
Energy Engineer / Senior Project Manager<br>
</span></font><ns0:PlaceName w:insAuthor="Keith Swartz"
w:insDate="2008-09-30T09:46:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2008-09-30T09:46:00Z"><st1:PlaceName w:st="on"><font color=navy><span
style='color:navy'>Energy</span></font></st1:PlaceName></ns0:PlaceName><font
color=navy><span style='color:navy'> </span></font><ns0:PlaceType
w:insAuthor="Keith Swartz" w:insDate="2008-09-30T09:46:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2008-09-30T09:46:00Z"><st1:PlaceType
w:st="on"><font color=navy><span style='color:navy'>Center</span></font></st1:PlaceType></ns0:PlaceType><font
color=navy><span style='color:navy'> of </span></font><ns0:State
w:insAuthor="Keith Swartz" w:insDate="2008-09-30T09:46:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2008-09-30T09:46:00Z"><ns0:place
w:insAuthor="Keith Swartz" w:insDate="2008-09-30T09:46:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2008-09-30T09:46:00Z"><st1:State
w:st="on"><st1:place w:st="on"><font color=navy><span style='color:navy'>Wisconsin</span></font></st1:place></st1:State><br>
</ns0:place></ns0:State><ns0:Street w:insAuthor="Keith Swartz"
w:insDate="2008-09-30T09:46:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2008-09-30T09:46:00Z"><ns0:address w:insAuthor="Keith Swartz"
w:insDate="2008-09-30T09:46:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2008-09-30T09:46:00Z"><st1:Street w:st="on"><st1:address w:st="on"><font
color=navy><span style='color:navy'>455 Science Drive, </span></font></ns0:address></st1:address></st1:Street></ns0:Street><ns0:address
w:insAuthor="Keith Swartz" w:insDate="2008-09-30T09:46:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2008-09-30T09:46:00Z"><ns0:Street
w:insAuthor="Keith Swartz" w:insDate="2008-09-30T09:46:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2008-09-30T09:46:00Z"><font
color=navy><span style='color:navy'>Suite</span></font></ns0:Street><font
color=navy><span style='color:navy'> 200<br>
</span></font></ns0:address><ns0:place w:insAuthor="Keith Swartz"
w:insDate="2008-09-30T09:46:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2008-09-30T09:46:00Z"><ns0:City w:insAuthor="Keith Swartz"
w:insDate="2008-09-30T09:46:00Z" w:endInsAuthor="Keith Swartz"
w:endInsDate="2008-09-30T09:46:00Z"><font color=navy><span style='color:navy'>Madison</span></font></ns0:City><font
color=navy><span style='color:navy'>, </span></font><ns0:State
w:insAuthor="Keith Swartz" w:insDate="2008-09-30T09:46:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2008-09-30T09:46:00Z"><font
color=navy><span style='color:navy'>WI</span></font></ns0:State><font
color=navy><span style='color:navy'> </span></font><ns0:PostalCode
w:insAuthor="Keith Swartz" w:insDate="2008-09-30T09:46:00Z"
w:endInsAuthor="Keith Swartz" w:endInsDate="2008-09-30T09:46:00Z"><font
color=navy><span style='color:navy'>53711<br>
<br>
</span></font></ns0:PostalCode></ns0:place><font color=navy><span
style='color:navy'>Phone: 608-238-8276 ext. 123, Fax: 608-238-0523<br>
<a href="http://www.ecw.org"></a><a href="http://www.ecw.org">www.ecw.org</a>
The Energy Center of Wisconsin is a nonprofit organization that seeks solutions
to energy challenges.</span></font><o:p></o:p></p>
</div>
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<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-rate-bounces@lists.onebuilding.org
[mailto:bldg-rate-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Dr. Dirk A. Schwede<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, September 29, 2008
3:20 AM<br>
<b><span style='font-weight:bold'>To:</span></b>
bldg-rate@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-rate] fenestration
area requirement according to ASHRAE5.5.4.2.1</span></font><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Hello,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>we
were asked to check the requirements for LEED NC EA P2 “Minimal Energy
performance” for a building in Berlin, Germany. The requirement 5.5.4.2.1
“Vertical Fenestration Area” of the ASHRAE 90.1 code says that the
total vertical fenestration area shall be less than 50% of the gross wall area,
section 5.2.1 even says that 50% vertical fenestration area shall not be
exceeded for each space conditioning category.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Although
we are aware that smaller windows are better for the buildings energy balance,
this “simple” requirement was much discussed between us, as it
would easily disqualify many modern buildings to comply with LEED requirements
and even with the ASHRAE Standard. ASHRAE alone would allow using the trade-off
path, however LEED requirements (Version NC 2.2) demand compliance with section
5.5 of the ASHRAE Standard alone and does not allow the trade-off option to be
used.- Do I read the code correctly, or is there a way to achieve LEED
certification for buildings with a fenestration area larger than 50%? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Best
Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Dirk
Schwede <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=DE style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=DE style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span lang=DE style='font-size:
11.0pt'><o:p> </o:p></span></font></p>
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