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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'>As for the chiller running year round –
the default operating mode is standby – that should be changed to either demand
or snap on OAT – otherwise your chiller runs whenever a system is running “just
in case” it needs 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>
<p class=MsoNormal><font size=2 color=navy face=Tahoma><span style='font-size:
10.0pt;font-family:Tahoma;color:navy'> </span></font></p>
<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> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <b><span style='font-weight:bold'>On Behalf Of </span></b>Mingming
Zuo<br>
<b><span style='font-weight:bold'>Sent:</span></b> October 6, 2007 4:04 AM<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] TEMP of air
leaving cool coil in equest--A confusing result!</span></font></p>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3 face=SimSun><span
style='font-size:12.0pt'> </span></font></p>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'>Dear all:</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3 face=SimSun><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'>Hi, I modeled a VAVs in eQUEST recently and the
parameters related are summarized below:</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3 face=SimSun><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'> 100% outside air for all the year</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'> for preheat coil, PREHEAT-T=48.2 F ;</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'> for central cool coil, COOL-SET-T=48.2 F and
MIN-SUPPLY-T=60.8F;</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'> for chilled water loop, loop operation = demand
only.</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'> no economizer and heat recovery.NO humidity
control!</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3 face=SimSun><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'>As in Shanghai, China, there are many hours when
outside air dry bulb temp will go below 48.2F, So I think no cooling from
chiller is needed.After simulation, I exmained hourly </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3 face=SimSun><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'>results report and found out the CHW loop ran all the
year and TEMP of air leaving cool coil is 46F. As no humidity control, in my
opinion, there is no need to lower coil temp.</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3 face=SimSun><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'>Why are temps of air leaving cool coil driven below 46
F while no cooling is needed?</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3 face=SimSun><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'>Thanks®ards</span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=3 face=SimSun><span
style='font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:36.0pt'><font size=2 face=SimSun><span
style='font-size:10.0pt'>Zuo Mingming</span></font></p>
</div>
</div>
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