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<DIV dir=ltr align=left><SPAN class=692473021-23072007><FONT face=Arial
color=#0000ff size=2>Brandon,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=692473021-23072007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=692473021-23072007><FONT face=Arial
color=#0000ff size=2>The first thing that I would do is open up the SIM file and
look at the LS-C report (Building Peak Load Components). This report tells you
what the total building envelope loads and internal heat gains are for peak
cooling and heating conditions. Here are the categories
provided:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=692473021-23072007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=692473021-23072007><FONT face="Courier New"
size=1>
<P><FONT face=Arial size=2>WALL CONDUCTION</FONT></P>
<P><FONT face=Arial size=2>ROOF CONDUCTION</FONT></P>
<P><FONT face=Arial size=2>WINDOW GLASS+FRM COND</FONT></P>
<P><FONT face=Arial size=2>WINDOW GLASS SOLAR</FONT></P>
<P><FONT face=Arial size=2>DOOR CONDUCTION</FONT></P>
<P><FONT face=Arial size=2>INTERNAL SURFACE COND</FONT></P>
<P><FONT face=Arial size=2>UNDERGROUND SURF COND</FONT></P>
<P><FONT face=Arial size=2>OCCUPANTS TO SPACE</FONT></P>
<P><FONT face=Arial size=2>LIGHT TO SPACE</FONT></P>
<P><FONT face=Arial size=2>EQUIPMENT TO SPACE</FONT></P>
<P><FONT face=Arial size=2>PROCESS TO SPACE</FONT></P>
<P><FONT face=Arial size=2>INFILTRATION </FONT></P></FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=692473021-23072007>Since
your building appears very insensitive to changes in glazing U-value my
guess is that this report will show that "<FONT color=#000000>WINDOW GLASS+FRM
COND" </FONT><FONT color=#0000ff>is small compared to the other loads or that
one of these other loads is much larger than the rest. This result may be
correct, especially if the gazing fraction of the facade is low. However,
if "<FONT color=#000000>UNDERGROUND SURF COND</FONT>" is the largest
conduction load then you may need to set U-EFFECTIVE for the slab floors
(reasonable values are between 0.01 and 0.02). </FONT></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=692473021-23072007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=692473021-23072007>You
may also find that the building is much more sensitive to changes in window
solar heat gain coefficient than changes in U-value.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=692473021-23072007></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=692473021-23072007>Russ
Taylor</SPAN></FONT></DIV><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT face="Lucida Console" color=#808080
size=2>_______________________________________________________________________________</FONT></SPAN>
</P>
<P><SPAN lang=en-us><FONT face="Lucida Console" color=#808080 size=2>Russell D
Taylor, Ph.D.</FONT></SPAN> <BR><SPAN lang=en-us><FONT face="Lucida Console"
color=#808080 size=2>UTRC | 411 Silver Lane, MS 129-85 | East Hartford, CT 06108
| Ph: (860) 610-7485</FONT></SPAN> <BR><SPAN lang=en-us><FONT
face="Lucida Console" color=#808080
size=2>_______________________________________________________________________________</FONT></SPAN>
</P>
<DIV> </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>Brandon Nichols<BR><B>Sent:</B>
Monday, July 23, 2007 5:10 PM<BR><B>To:</B> BLDG-SIM@gard.com<BR><B>Subject:</B>
[BLDG-SIM] Simulations Insensitive to Glass Changes<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007>All,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007>I have a 3-story historic building, with
circa-1920's windows on all four exposures. Big, beautiful, clear-glass
single-pane architectural masterpieces. So while doing an optimization
study, it became apparent to me that substantially changing the U-value and
infiltration coefficients was having very little effect at all on the
loads.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007>For example, varying the U-value from 1.27 to
0.55, 0.45 and at last 0.30 in the parametric runs using the
'simplified method' produced a 0.5% total (over all runs) change in the total
energy consumption. Selecting representative glass types using the
'library method' produced essentially equivalent. Superimposing upon
either of these a change in the infiltration coefficient from 1/4" to 1/8" to
1/16" to 1/32" produced no additional effect at all (the INF-METHOD = CRACK
keyword is specified) on the annual energy consumption.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007>Lastly, I changed the baseline glass to "unglazed
opening", again with a mystifying zero net effect on the overall
energy consumption. It's as if the glass is not being calculated at
all, but I see no errors or warnings in the SIM file.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007>Anyone have an idea on how to debug
this?</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Courier New" color=#0000ff size=2><SPAN
class=719335320-23072007>Thanks in advance...</SPAN></FONT></DIV>
<DIV><FONT face="Courier New" color=#0000ff size=2></FONT> </DIV>
<DIV align=left>
<DIV align=left><FONT face=Arial size=2></FONT> </DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT color=#000000>Brandon Nichols,
PE</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT
color=#000000>Mechanical</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#000080><STRONG>HARGIS ENGINEERS</STRONG></FONT></DIV>
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style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
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style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">d
|</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
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<DIV> </DIV></DIV>
<DIV><FONT face="Courier New" color=#0000ff size=2></FONT> </DIV><PRE>
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