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<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff>International Glazing Database (IGDB), which is part of WINDOW 5.2
program (windows.lbl.gov) contains several hundred individual glass layers whose
solar transmittance is at or below 0.3, which, as a part of glazing system and
whole fenestration product, would produce SHGC of 0.25 or lower, which meets
ASHRAE 90.1 for all climate zones. The best choice for low SHGC windows is
so called spectrally selective low-e, and there are at least 100 glass
products with this type of low-e coating. The cost of these products is
only marginally higher than the cost of clear glass.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff>I think that you are definitely overlooking
something.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff>Having said that, I do want to state that the use of low SHGC
products in heating dominated climates (anything at or above climate zone 5) is
wrong and is the major flaw of both ASHRAE 90.1 and IECC 2006, particularly for
orientations with potentially high solar gain in the winter, such as South
orientation.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=437263312-09042007><SPAN
class=453152915-31052005><FONT face=Arial>D. Charlie Curcija</FONT></SPAN></DIV>
<DIV dir=ltr align=left>
<DIV align=left>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>Carli,
Inc.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>18
Tanglewood Rd.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>Amherst,
MA 01002</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT
face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>Tel:
(413) 256-4647</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>Fax:
(413) 256-4823</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>cell:
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<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>email:
</FONT><A href="blocked::mailto:curcija@fenestration.com"><FONT
face=Arial>curcija@fenestration.com</FONT></A></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><FONT face=Arial>web:
</FONT><A href="http://www.fenestration.com/"><FONT
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class=640374411-20062006>S</SPAN>upport open document format as the <SPAN
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</EM></STRONG></FONT></SPAN></SPAN></FONT></EM></STRONG>
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<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Scott Runyon<BR><B>Sent:</B>
Monday, April 09, 2007 7:52 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] ASHRAE 90.1 - window
SHGC<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana">When modeling my design case, I
find that most windows cannot achieve the minimum SHGC suggested in ASHRAE
90.1.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana">Why would ASHRAE set unattainable
minimum values? <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana">Am I overlooking something in
ASHRAE 90.1???<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana">Any help would be
appreciated.<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana">Thanks,<o:p></o:p></SPAN></FONT></P>
<P><FONT face=Verdana size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana">Scott<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV><PRE>
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