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<DIV dir=ltr align=left><SPAN class=886072515-28092010><FONT color=#0000ff
size=2 face=Arial>We have modeled in eQUEST an existing large office
building that had chiller/heat pumps with evaporative cooling towers, where we
had a hot water loop with hot thermal storage heated by the heat pump with
boiler back up. The hot water loop was typically like 95
degrees. We also had a chilled water loop that had cold thermal
storage. The separate cooling tower loop was able to cool the chilled
water loop when cooling tower loop temperatures allowed it. The chilled
water loop was typically like 50 degrees. We had around 250,000
gallons of existing underground thermal storage tanks on the project.
Our building thermal storage had 4 tanks with the valving capability
of us switching from 100% hot thermal storage to 100% chilled water storage and
anywhere in between at 25% levels, at different times of the
year. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=886072515-28092010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=886072515-28092010><FONT color=#0000ff
size=2 face=Arial>When we first set out to do this eQUEST model we were not sure
from documentation that eQUEST could model it. Due to the fact that
we could not fail, and delay the project, and lose time having to start
over modeling in another program, we did two concurrent models one with eQUEST
and one with Micro-AXCESS. I did the Micro-AXCESS model and
another gentleman in our firm did the eQUEST model. Micro-AXCESS is a DOS
based hourly climate history based energy modeling program that we had used
for over 17 years, that we had modeled projects of this type in
earlier and we knew it would model it for sure. We compared the output
results of both programs and they were very similar. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=886072515-28092010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=886072515-28092010><FONT color=#0000ff
size=2 face=Arial>In the end both programs, for this particular site showed,
that due to additional losses with the storage tanks,etc., that we used
slightly more energy with the storage tanks than without</FONT> <FONT
color=#0000ff size=2 face=Arial>and for this Northern USA site the operating
costs were higher. This may not be true with a different climate site
location. Also, our site did not have lower electrical rates at night,
that might be a consideration at other locations.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=886072515-28092010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=886072515-28092010><FONT color=#0000ff
size=2 face=Arial>I have attached some info from the eQUEST item helps on the
subject to take a look at.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=886072515-28092010><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=886072515-28092010>
<DIV align=left>
<DIV align=left><STRONG><EM><FONT color=#0000ff size=6
face="Bradley Hand ITC">David A. Bastow </FONT></EM></STRONG></DIV>
<DIV align=left><STRONG><EM><FONT face="Rockwell Extra Bold">McClure
Engineering, Inc. </FONT></EM></STRONG></DIV></DIV></SPAN></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Cassie
Waddell<BR><B>Sent:</B> Monday, September 27, 2010 5:25 PM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] Condenser
Water Storage<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman','serif'">Has
anyone ever attempted to model condenser water storage using eQuest? The idea is
to run the cooling towers at night to take advantage of the low WB temps and
then use condenser water directly in a radiant system instead of running the
chillers. It looks to me like the only way to model thermal storage is on the
chilled water loop. <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman','serif'">Please
let me know if you have any ideas. Thanks,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'"><o:p> </o:p></SPAN></B></P>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'"><o:p> </o:p></SPAN></B></P>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'">Cassie Waddell</SPAN></B><B><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; COLOR: #d22d7d; FONT-SIZE: 10pt">
</SPAN></B><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; COLOR: #595959; FONT-SIZE: 10pt"> P.E.
LEED AP<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; COLOR: #595959; FONT-SIZE: 10pt">Mechanical
Engineer<o:p></o:p></SPAN></P>
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<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Times New Roman','serif'; COLOR: #595959">Arup<o:p></o:p></SPAN></B></P>
<P class=MsoNormal><SPAN
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Mission Street Suite 700 San Francisco CA
94105<o:p></o:p></SPAN></P>
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+1 415 957 9445 <B>d</B> +1 415 946 1660<o:p></o:p></SPAN></P>
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