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<p class=MsoNormal><font size=2 color=navy face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;color:navy'>On the first question, one of the chiller
types in eQUEST is “water economizer” – which is effectively
a heat exchanger between the chilled and condenser water loops. You will
have to play with your loop equipment controls and load management to set when
the chillers are cooling and when you are on “free cooling”. </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;color:navy'> </span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;color:navy'>Brian Fountain</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;color:navy'>GreenSim</span></font></p>
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style='font-size:12.0pt;color:navy'> </span></font></p>
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<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> </span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>bldg-sim@gard.com</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> [mailto:</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>bldg-sim@gard.com</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Sarathy Narasimhan<br>
<b><span style='font-weight:bold'>Sent:</span></b> February 15, 2006 12:50 PM<br>
<b><span style='font-weight:bold'>To:</span></b> </span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>bldg-sim@gard.com</span></font><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'><br>
<b><span style='font-weight:bold'>Subject:</span></b> [bldg-sim] CW Loop Ctrls</span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'> </span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I was simulating the central plant
for a hotel in eQuest. I have a couple of questions on modeling the condenser
water control.</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'> </span></font></p>
<p class=MsoNormal style='margin-left:72.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>1.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>I was trying to model free-cooling plate-to-frame
heat exchanger between CW & CHW loops – eQuest 3.55 doesn’t
seem to handle this. Any suggestions?</span></font></p>
<p class=MsoNormal style='margin-left:72.0pt;text-indent:-18.0pt'><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>2.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></font><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>When I tried to add VFD on my condenser water pumps,
I get a bunch of warnings as shown below. I haven’t used any custom
curves for the pumps (though I used them for the chillers being modeled –
but I tried changing them to default and even then the warnings wouldn’t
go – not sure exactly what they mean – any help would be greatly
appreciated)</span></font></p>
<p class=MsoNormal style='margin-left:90.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>CURINV: No real root for CURVE: </span></font></p>
<p class=MsoNormal style='margin-left:90.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>1 1.353483 0.015932
-0.369414 0.000000 0.000000 0.000000</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>
</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Thank you,</span></font></p>
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<p class=MsoNormal><b><font size=1 face=Verdana><span style='font-size:
8.0pt;font-family:Verdana;font-weight:bold'>Sarathy Narasimhan</span></font></b><font
size=1 face=Verdana><span style='font-size:8.0pt;font-family:Verdana'><br>
<i><span style='font-style:italic'>Analyst, Energy Efficiency</span></i> </span></font></p>
<p class=MsoNormal><b><font size=1 face=Verdana><span style='font-size:
8.0pt;font-family:Verdana;font-weight:bold'>Energy and Power Solutions,
Inc.</span></font></b><font size=1 face=Verdana><span style='font-size:
8.0pt;font-family:Verdana'><br>
<a
href="http://maps.yahoo.com/py/maps.py?Pyt=Tmap&addr=150+Paularino+Avenue&csz=Costa+Mesa%2C+CA+92626&country=us"
target="_blank"><font color=black><span style='color:windowtext;text-decoration:
none'>150 Paularino Avenue Suite A120<br>
Costa Mesa, CA 92626</span></font></a></span></font></p>
</td>
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<p class=MsoNormal><font size=1 face=Verdana><span style='font-size:8.0pt;
font-family:Verdana'><a href="mailto:sarathyn@energynpower.com"
target="_blank"><font color=black><span style='color:windowtext'>sarathyn@energynpower.com</span></font></a>
</span></font></p>
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<pre style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt'> </span></font></pre><pre style='margin-left:
36.0pt'><font size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre
style='margin-left:36.0pt'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>==================</span></font></pre><pre
style='margin-left:36.0pt'><font size=2 face="Courier New"><span
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