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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Seun-<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I think John has a point that you might be
using too much internal gains. Typical guidelines/defaults for internal
loads are usually aimed at solving questions of design loads and not
operational consumption over a period of time. So check that your plug
and lighting loads are reasonable. If you’re absolutely obsessed with
detail, you would use sub-metering data for lights and equipment to compare the
kWh over a period to the result of your schedules and power density over an
equivalent period. Alternately, a simple survey (with spot metering) of
equipment draw and estimates of operating schedules should get you close
enough. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>One thing that has been missing from the
discussion is infiltration. This could well be the most significant
variable – especially in your heating climate. It is generally
ignored in simulations and most engineering calculations because it is a real bugaboo
– very difficult to define. But it may be possible to “bracket”
the infiltration. There are a couple of ways that you could estimate or
assess the infiltration performance of the actual building. Tracer gas
testing could give you a quantitative measure of actual air changes under the
conditions of the test. The difficulty in this method is translating the
results of the test under the specific test conditions to estimates of what
might happen under other conditions. To use tracer gas infiltration data
in the model, you would use an infiltration method that responds to outdoor
temperature and, probably wind, and then determine what values for other
parameters are needed in DOE2 to arrive at a similar calculation of
infiltration (or air changes) in the simulation under simulation weather
conditions that correspond to those of the test. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Perhaps a simpler method would be to use
fan pressurization testing to estimate the leakage characteristics of the building
enclosure. You can then give DOE2 corresponding inputs describing the
leakage characteristics of the building enclosure (whether the algorithms within
DOE2 will produce reasonably accurate estimates of infiltration from these is
another story.)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Lastly, you could do what some un-named
parties in the building modeling world advocate and just adjust the
infiltration lever in the model until the model results match the measured
results. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>All in all, having been tied to a chair
doing DOE2 runs in a windowless basement lab as a graduate student myself, I
think it worthwhile to pass along wisdom that a very pragmatic engineer offered
to me: “The model is a representation of reality. It is not
reality.” In other words, the model is only a mathematical
representation of what is happening thermodynamically within the building. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Or, in the immortal line from Monty Python’s
“The Holy Grail” (King Arthur’s page) “It’s only
a model.”<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Best regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Ken<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:6.0pt;margin-right:0in;margin-bottom:
3.0pt;margin-left:0in;mso-margin-top-alt:.5gd;mso-para-margin-right:0in;
mso-para-margin-bottom:.25gd;mso-para-margin-left:0in'><font size=2 color=navy
face=Arial><span lang=DE style='font-size:10.0pt;font-family:Arial;color:navy'>Ken
Neuhauser, M.Arch, MSc.Arch, LEED AP<o:p></o:p></span></font></p>
<p class=MsoNormal><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy;font-style:italic'>Architectural
Project Manager<o:p></o:p></span></font></i></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Conservation Services Group, Inc.<o:p></o:p></span></font></p>
<p class=MsoNormal><u1:Street u2:st="on"><u1:address u2:st="on"><st1:Street
w:st="on"><st1:address w:st="on"><font size=1 color=navy face=Arial><span
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<p class=MsoNormal></u1:address></u1:Street><u1:place u2:st="on"><u1:City u2:st="on"><st1:place
w:st="on"><st1:City w:st="on"><font size=1 color=navy face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:navy'>Westborough</u1:City></span></font></st1:City><font
size=1 color=navy face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:navy'>, <u1:State u2:st="on"><st1:State w:st="on">MA</u1:State></st1:State>
<u1:PostalCode u2:st="on"><st1:PostalCode w:st="on">01581</u1:PostalCode></st1:PostalCode></span></font></st1:place><font
size=1 color=navy face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:navy'></st1:place>Ph. 508 836-9500 ext. 13226<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:navy'>Fax 508 836-3181<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:navy'><a href="http://www.csgrp.com/">www.csgrp.com</a> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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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>Seun Odukomaiya<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, November 22, 2007
8:53 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] Help
calibrating eQuest building model</span></font><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 face=Consolas><span style='font-size:10.5pt'>Hello,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>My
name is Seun Odukomaiya. I am a graduate student at <st1:place w:st="on"><st1:PlaceName
w:st="on">Purdue</st1:PlaceName> <st1:PlaceType w:st="on">University</st1:PlaceType></st1:place>
working on the Building Sciences. As part of my research, I am trying to
calibrate an eQuest model to match the energy performance of an actual building
for which i have data. Currently, I am having difficulties with the electric
heating element. The actual building (and thus the model) utilizes an electric
heating element. The energy data from the model, however, is much lower than
that of the actual building. I have tried several things, but have been
unsuccessful in increasing the energy consumption of the electric heating
element in my eQuest model. I need to increase the energy consumption of the
electric heating element in my eQuest model to get it to match the data from the
actual building. Any help in ways to accomplish this within eQuest would be so
greatly appreciated. Thank you in advance.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Seun
Odukomaiya<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Mechanical
Engineering Technology<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:PlaceName w:st="on"><font size=2
face=Calibri><span style='font-size:11.0pt'>Purdue</span></font></st1:PlaceName>
<st1:PlaceType w:st="on">University</st1:PlaceType></st1:place><o:p></o:p></p>
<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>==================<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>You received this e-mail because you are subscribed <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>to the BLDG-SIM@GARD.COM mailing list. To unsubscribe <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>from this mailing list send a blank message to <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>BLDG-SIM-UNSUBSCRIBE@GARD.COM<o:p></o:p></span></font></pre></div>
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