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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Hi Charles,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>You can model this using a chiller of the type called ‘water
economizer chiller’ this has some limitations however. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>Note however that the waterside economizer chiller will be used
only as a 'all or nothing' where it is used only when it can meet all of the
load, not partial loads hence possibly under estimating the energy
savings. Also it is important to have only one cooling tower assigned
when using water side economizer chiller. </span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'>I have pasted the help section below that describes this - </span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><a name="1280793d9a76ce28__Toc153845383"><u><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'>Chiller
Water-Economizer</span></u></a><o:p></o:p></p>
<p style='margin-left:.5in'> The program assumes a
water-side economizer is used in an “all or nothing” mode. If the
water-side economizer can handle the entire cooling load, then it will be used.
Otherwise, the loop will use its other chillers. A water-side economizer cannot
precool the return flow prior to entering the chillers.<br>
<br>
The “all or nothing” mode precludes the use of an EQUIP-CTRL
sequence to coordinate the operation of an economizer chiller with other
chillers. If you list a water-side economizer chiller in an EQUIP-CTRL
sequence, it will be ignored.<o:p></o:p></p>
<p style='margin-left:.5in'> There must be a one-to-one
correspondence between a CHW loop, a water-side economizer, and a CW loop. A
CHW loop may be supplied by only one water-side economizer, and a CW loop may
supply only one water-side economizer. In other words, a plant may have any
number of chilled water loops having water-side economizers, but those
economizers cannot draw from the same CW loop. The program will generate an
error if this condition is not met.<o:p></o:p></p>
<p style='margin-left:.5in'> If a CW loop supplies a
water-side economizer, it may also supply chillers serving the same CHW loop as
the economizer. However, it cannot supply chillers serving other CHW loops. The
program will generate an error if this condition is not met.<o:p></o:p></p>
<p style='margin-left:.5in'> A CW loop supplying a
water-side economizer should have only one cooling tower. More than one cooling
tower is allowed, however only the first tower defined will be checked to see
if sufficient free cooling capacity is available. Once free cooling is
allocated to a CW loop, the program may use any combination of towers to
satisfy it. <i>The program may underpredict the water-side economizer savings
if more than one cooling tower serves a given CW loop. To minimize the
underprediction, define the largest tower first.</i><o:p></o:p></p>
<p style='margin-left:.5in'> If there is any water-cooled
packaged equipment in the SYSTEM command, this equipment will be ignored when
determining whether the tower has sufficient free cooling capacity. <i>This may
cause the program to overpredict water-side economizer savings.</i><o:p></o:p></p>
<p style='margin-left:.5in'> For maximum effectiveness,
the CHW loop should have COOL-SETPT-CTRL = LOAD-RESET. This allows the CHW
temperature setpoint to rise during periods of low loads, maximizing the
effectiveness of the water-cooled economizer.<o:p></o:p></p>
<p style='margin-left:.5in'><o:p> </o:p></p>
<p style='margin-left:.5in'>Enjoy!<o:p></o:p></p>
<p style='margin-left:.5in'>Amarpreet<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:blue'>Amarpreet Sethi MSc LEED AP</span></b><span style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:blue'><br>
Sustainable Building Analyst<br>
Stantec<br>
</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:gray'>amarpreet.sethi@stantec.com </span><span style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:blue'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:13.0pt;font-family:"Arial Narrow","sans-serif";
color:blue'><a href="http://www.stantec.com"><b><span style='color:#993333;
text-decoration:none'>stantec</span></b><span style='color:#003F6E;text-decoration:
none'>.com</span></a> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:blue'> <o:p></o:p></span></p>
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color:blue'>The content of this email is the confidential property of Stantec
and should not be copied, modified, retransmitted, or used for any purpose
except with Stantec's written authorization. If you are not the intended
recipient, please delete all copies and notify us immediately.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:blue'> <o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:13.5pt;font-family:Webdings;
color:#008040'>ü</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:blue'> </span><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif";
color:#008040'>Please consider the environment before printing this email.</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:blue'><o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Charles Land
[mailto:cland@geo-marine.com] <br>
<b>Sent:</b> Wednesday, June 02, 2010 8:26 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Waterside Economizer<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Does anyone know a way to do waterside economization other
than through the airside tabs. The building I’m currently modeling
has older multizone systems with a water to water heat exchanger for waterside
economization. Equest does not give the option for waterside
economization for multizone units. I thought there may be a way to create
a heat exchanger and accomplish this through a water side route but have so far
been unsuccessful.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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