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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-SIM@gard.com [mailto:BLDG-SIM@gard.com] <b><span style='font-weight:bold'>On
Behalf Of </span></b>David S Eldridge<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, April 10, 2007 3:15
PM<br>
<b><span style='font-weight:bold'>To:</span></b> BLDG-SIM@gard.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [BLDG-SIM] ASHRAE 90.1 -
window SHGC</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Remember that those total annual energy
quantities include heating/cooling for the outside air which may be different
than envelope heating loads, and that the energy costs are not the same per
BTU. (Not sure where the EIA totals come from - DHW may also be
included?)</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>That said, a typical
"square" design would have perimeter zones that would/wouldn't
need heating even while the core of the building required
cooling. That effect would be captured by an ECB analysis or
Appendix G analysis with the baseline building being "penalized' for using
the standard's glazing. The trade-offs between additional cooling and
beneficial solar heating could be quantified then, including the costs.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Obviously, a building that might benefit
from reduced glazing requirements will now have to do a simulation to document
that fact in the code or LEED process. They could probably
commission a much simplified model to determine what level of glazing works
best and then either build a prescriptive building or pursue ECB as necessary.</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>A LEED building would normally have much
of this modeling work included in their scope anyway for EAC1, so an additional
modeling exercise to determine the optimal glazing wouldn't be a big deal.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>I only see this as a major problem for
buildings in the northerly climates that wanted to use 90.1
prescriptively, and that weren't going to run an energy model already. I
don't have a feel for how many buildings would fall into that category.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>--------------------------------------------------------------<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>David S. Eldridge, Jr.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Project Engineer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>LEED v2.0 Accredited Professional<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Grumman/Butkus Associates<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=2
color=blue face=Arial><span style='font-size:10.0pt;font-family:Arial;
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face=Arial><span style='font-size:10.0pt;font-family:Arial;color:blue'>, <st1:State
w:st="on">IL</st1:State> <st1:PostalCode w:st="on">60201</st1:PostalCode></span></font></st1:place><font
size=2 color=blue face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:blue'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>847.328.3555 ext. 224<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><a href="mailto:dse@grummanbutkus.com">dse@grummanbutkus.com</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>-------------------------------------------------------------<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
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face="Times New Roman"><span style='font-size:12.0pt'>
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<p class=MsoNormal style='margin-bottom:12.0pt'><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-SIM@gard.com [mailto:BLDG-SIM@gard.com] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Leonard Sciarra<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, April 09, 2007 1:43
PM<br>
<b><span style='font-weight:bold'>To:</span></b> BLDG-SIM@gard.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [BLDG-SIM] ASHRAE 90.1 -
window SHGC</span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Charlie,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>(this maybe off topic) </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Good point, however, you must remember,
that the development of the prescriptive tables in 90.1 is based on a generic
office building with an floor plan aspect ratio of 1:1. it is an
internally load dominated building, so even up to climate zone 7 (maybe
not 8) in calculating ANNUAL energy consumption, reducing solar heat gain
(while allowing some light in for assumed daylighting) was the key factor in
the glazing selection that comes out of the model. Again, it was annual
energy consumption. </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Prescriptive codes are blunt instruments
of change. I think we all agree that if you change the building
aspect ratio, choose good glass/shading and install a daylight
harvesting/dimming system, design the interior to take advantage
of all of this, you are 70% of the way to a kick ass energy efficient
design.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p style='margin:0in;margin-bottom:.0001pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Leonard Sciarra, AIA, LEED ap<o:p></o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>312.577.6580 (Dir)</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>G E N S L E R | Architecture &
Design Worldwide</span></font><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><st1:Street w:st="on"><st1:address
w:st="on"><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>30 West Monroe Street</span></font></st1:address></st1:Street><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><st1:place w:st="on"><st1:City
w:st="on"><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>Chicago</span></font></st1:City><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> <st1:State w:st="on">IL</st1:State>,
<st1:PostalCode w:st="on">60603</st1:PostalCode></span></font></st1:place><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p style='margin:0in;margin-bottom:.0001pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>312.456.0123<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<o:p></o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabIndex=-1>
</span></font></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><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-SIM@gard.com [mailto:BLDG-SIM@gard.com] <b><span style='font-weight:bold'>On
Behalf Of </span></b>D. Charlie Curcija<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, April 09, 2007 8:50
AM<br>
<b><span style='font-weight:bold'>To:</span></b> BLDG-SIM@gard.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [BLDG-SIM] ASHRAE 90.1 -
window SHGC</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'>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.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'>I think that you are definitely
overlooking something.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:blue'>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.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>D. Charlie Curcija</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Carli, Inc.</span></font><o:p></o:p></p>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=3
face=Arial><span style='font-size:12.0pt;font-family:Arial'>18 Tanglewood Rd.</span></font></st1:address></st1:Street><o:p></o:p></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=3
face=Arial><span style='font-size:12.0pt;font-family:Arial'>Amherst</span></font></st1:City><font
face=Arial><span style='font-family:Arial'>, <st1:State w:st="on">MA</st1:State>
<st1:PostalCode w:st="on">01002</st1:PostalCode></span></font></st1:place><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Tel: (413) 256-4647</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Fax: (413) 256-4823</span></font><o:p></o:p></p>
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