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<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff>Len,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff>I knew that I would touch sensitive subject. Actually, we
ran number of different simulations using both DOE2 and EnergyPlus and in vast
majority of cases for commercial buildings low SHGC products use more energy in
climate zones 5 and above than comparable high solar gain products. One of
the reasons that this may not have been the case when ASHRAE 90.1 ran scalar
studies, is that it used overly simplified methodology, embedded in a
spreadsheet, which assumes constant SHGC and U-factor. We have shown
(and some others, like Jeff Haberl from ESL) that this oversimplification causes
errors upwards of 30%! I have been pointing this to the 90.1
envelope subcommittee for quite some time now, but it pretty much fell on deaf
ears and was ignored.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff>The contention that commercial buildings are internal load
dominated and that the heating load is not a factor, is a myth, which is easily
verified by looking at the DOE energy information agency data, where it is
evident that commercial buildings in United States use more energy for heating
than for cooling on a national level, which includes all climate zones, such as
1, 2, etc. If the building stock uses more energy for heating than for
cooling when cooling climate zones are accounted for, it is easy to deduce that
they are using much more energy for heating than for cooling for climate zones 5
and above. If the argument is to reduce peak cooling load, then there is
some merit in using low solar gain products in the North, but we should be very
clear on this.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff>We have developed a new tool EFEN, which calculates energy use of
commercial buildings using EnergyPlus simulation engine, and we have interface
to WINDOW5 program, so this is all easily verified. The program is
currently in Beta testing, so feel free to check it out at: <A
href="http://www.designbuildersoftware.com/efen.php">www.designbuildersoftware.com/efen.php</A>.
The program provides parametric analysis, so you can easily compare different
options.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff>Regards,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=578355119-09042007><FONT face=Arial
color=#0000ff>Charlie</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Leonard Sciarra<BR><B>Sent:</B>
Monday, April 09, 2007 2:43 PM<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><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2>Charlie,</FONT></SPAN></DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff size=2>(this
maybe off topic) </FONT></SPAN></DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff size=2>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. </FONT></SPAN></DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2>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.</FONT></SPAN></DIV>
<DIV><SPAN class=994253318-09042007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=994253318-09042007>
<P style="MARGIN: 0in 0in 0pt" align=left><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>Leonard Sciarra, AIA, LEED ap<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>312.577.6580 (Dir)</FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>G E N S L E R | Architecture & Design Worldwide</FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>30 West Monroe Street<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>Chicago IL, 60603<o:p></o:p></FONT></SPAN></P>
<P style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 11pt; FONT-FAMILY: Arial; mso-bidi-font-size: 10.0pt"><FONT
size=2>312.456.0123<o:p></o:p></FONT></SPAN></P></SPAN></DIV>
<DIV><SPAN class=994253318-09042007></SPAN><BR> </DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>D. Charlie
Curcija<BR><B>Sent:</B> Monday, April 09, 2007 8:50 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 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:
(413) 575-3487</FONT></SPAN></DIV>
<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
face=Arial>http://www.fenestration.com</FONT></A></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>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><SPAN
class=453152915-31052005><FONT size=2><FONT face=Arial><FONT size=3><SPAN
class=453152915-31052005><FONT face="Times New Roman" size=3></FONT><FONT
size=2>
<DIV dir=ltr align=left><SPAN class=453152915-31052005><SPAN
class=453152915-31052005><FONT size=2><STRONG><EM><FONT size=3><SPAN
class=453152915-31052005><SPAN class=453152915-31052005><FONT
size=2><STRONG><EM><FONT size=3><SPAN class=453152915-31052005><SPAN
class=453152915-31052005><FONT size=2><STRONG><EM><FONT size=3><SPAN
class=453152915-31052005><SPAN class=453152915-31052005><FONT
size=2><STRONG><EM><FONT size=3><SPAN class=453152915-31052005><SPAN
class=453152915-31052005><FONT size=2><SPAN class=453152915-31052005><SPAN
class=453152915-31052005><STRONG><EM><FONT face=Arial><FONT size=3><SPAN
class=640374411-20062006>S</SPAN>upport open document format as the <SPAN
class=375302716-12112005>best </SPAN>way to assure <SPAN
class=000590211-17112005>full compatibility<SPAN class=948042211-08122005> and
interoperability</SPAN></SPAN><SPAN
class=640374411-20062006>!</SPAN></FONT></FONT></EM></STRONG></SPAN></SPAN></FONT></SPAN></SPAN></FONT></EM></STRONG></FONT></SPAN></SPAN></FONT></EM></STRONG></FONT></SPAN></SPAN></FONT>
</EM></STRONG></FONT></SPAN></SPAN></FONT></EM></STRONG>
<DIV align=left>
<DIV dir=ltr align=left><FONT
color=#0000ff></FONT></FONT></SPAN></SPAN></FONT></SPAN></FONT></FONT></FONT></SPAN></SPAN></SPAN></SPAN> </DIV></DIV></DIV></DIV></DIV></DIV></DIV><PRE>
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