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<DIV><SPAN class=421081921-15122005><FONT face=Arial color=#0000ff size=2>When
using a "high performance glazing" you need to be careful. Every building
has a different signature (i.e. different shape, size, occupancy, climate,
etc.) Therefore, one should be careful to say a "high performance" glazing
is better than a lesser performance glazing. It is best to model a wide
range of u-values such that you can see which glazing is optimal for the
specific building. Often, one will see that a manufacturer says it is
"high performance" which it is on its own. But, couple that with your wall
insulation and the "high performance" wall configuration requires a
different u-value.</FONT></SPAN></DIV>
<DIV><SPAN class=421081921-15122005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=421081921-15122005><FONT face=Arial color=#0000ff size=2>You
will see a point of diminishing return and in many cases a point at which the
lower window u-value coupled with your wall insulation will in fact cause
one load to go up and the other to go down or vice versa, depending on your
climate. This is also similar in determining when you have too much or too
little insulation. What "high performance" glazings do is allow an
opportunity to determine what the most cost effective path is,
decreased window u-value or increased wall insulation. Therefore, one
is able to have several optimization paths.</FONT></SPAN></DIV>
<DIV><SPAN class=421081921-15122005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=421081921-15122005><FONT face=Arial color=#0000ff size=2>I find
it convenient to produce a graphical representation (excel is pretty easy for
this) to graph the variable versus the desired output (energy used or dollars
saved, if a LEED project).</FONT></SPAN></DIV>
<DIV><SPAN class=421081921-15122005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=421081921-15122005><FONT face=Arial color=#0000ff size=2>I hope
this helps.</FONT></SPAN></DIV>
<DIV><SPAN class=421081921-15122005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=421081921-15122005><FONT face=Arial color=#0000ff
size=2>-Mitch</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV class=Section1>
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<P style="MARGIN-BOTTOM: 6pt"><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Mitchell J. Dec</SPAN></B><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Energy Analyst </SPAN><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">503.345.6283 |<U> <SPAN
style="COLOR: blue"><A
href="mailto:mdec@glumac.com">mdec@glumac.com</A></SPAN></U></SPAN> </P>
<P style="MARGIN-BOTTOM: 6pt"><A href="http://www.glumac.com/"><SPAN
style="TEXT-DECORATION: none; text-underline: none"><IMG height=37
src="file://C:\Documents and Settings\MJD\Application Data\Microsoft\Signatures\./Mitch1_files/image001.gif"
width=339 border=0 v:shapes="_x0000_i1025" NOSEND="1"></SPAN></A><o:p></o:p></P>
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</DIV>
<P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">320 SW Washington, Suite
200</SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Portland, OR
97204-2640</SPAN><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">T.
503.227.5280 F. 503.274.7674<BR><BR><B><SPAN
style="COLOR: #333333">Thinking. Inside the
building.</SPAN></B></SPAN><BR><U><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial"><A
href="http://www.glumac.com/"
target=_blank>http://www.glumac.com/</A></SPAN></U> </P></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Zoeteman, Mark R.
[mailto:mrzoeteman@FTCH.com]<BR><B>Sent:</B> Thursday, December 15, 2005 12:53
PM<BR><B>To:</B> bldg-sim@gard.com<BR><B>Subject:</B> [bldg-sim] High
Performance Glazing<BR><BR></FONT></DIV><!-- Converted from text/rtf format -->
<P><FONT face=Arial size=2>I am modeling high performance glazing with U=0.14,
SC=0.35 and comparing to typical 1" thick insulating low-e glass with U=0.33,
SC=0.76. Climate is midwest US and 86% of the glass is facing north. The
north wall is basically all glass and spandrel. Heating is suppied from
district steam supply.</FONT></P>
<P><FONT face=Arial size=2>Results show increased steam energy consumption
from February through September with high performance glazing and less for
remaining winter months. HVAC system is VAV with hot water reheat
coils.</FONT></P>
<P><FONT face=Arial size=2>Overall annual steam energy consumption reduction
is very small. I expected to see significant heating energy savings due to
increased perimeter R-value. Has anyone modeled high performance glazing and
seen similar results? </FONT></P><BR>
<P><FONT face=Arial size=2>Mark Zoeteman</FONT> <BR><FONT face=Arial
size=2>FTC&H, Inc.</FONT> <BR><FONT face=Arial size=2>(616)
464-3739</FONT> <BR><U><FONT face=Arial size=2>mrzoeteman@ftch.com</FONT></U>
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