<div dir="ltr">Sebastian,<div><br></div><div>A very interesting device you are trying to model! I assume it looks something like this:</div><div><a href="http://www.motivaircorp.com/products/air-cooled-chillers/free-cooling-chillers.html">http://www.motivaircorp.com/products/air-cooled-chillers/free-cooling-chillers.html</a><br>
</div><div><br></div><div>In looking at the diagram and spec, I think their air cooled chiller acts most like a non integrated waterside economizer. The free cooling either does everything or it does nothing.</div><div><br>
</div><div>I would advise</div><div><ol><li> setting up 1 CHW loop with an Air cooled chiller and the WSE chiller object.<br></li><li>The WSE chiller should autosize to whatever the air cooled chiller is. For safety, I might just put in the size manually.</li>
<li>Create a CW loop and tower to attach to the WSE chiller</li><li>Set the tower to be a closed tower, so water does not evaporate and it acts just like the air cooled condenser coil of your product</li><li>Manually size the cooling tower</li>
<li>Set the CW loop to size based on the Secondary equipment. The loop defaults to the primary equipment, which in this case is our WSE chiller which might crash or not size. By selecting secondary, the loop will now look at the cooling tower and determine it's size</li>
<li>Use the CHW plant manager and sequence the chillers so the WSE chiller always goes first. It may not be able to provide cooling if it is to hot outside but it will always try to and succeed when weather permits.</li>
</ol>
<div>The other thing I would recommend is getting the chiller curves right. The product I found says they have a buffer tank for refrigerant to help balance out demand and smooth out compressor performance. I bet this is doing a lot more for efficiency than the WSE is and should be included.</div>
</div><div><br></div><div>Cheers,</div><div><br></div><div>Neil</div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><p style="margin:0px;background-color:rgb(255,255,255)"><span lang="EN-CA" style="font-size:10pt;font-family:Arial,sans-serif"><b><font color="#444444">Neil Bulger, PE</font></b><font color="#7f7f7f"> </font></span><span style="font-size:small;color:rgb(127,127,127);font-family:Arial,sans-serif">|</span><span style="font-size:10pt;color:rgb(127,127,127);font-family:Arial,sans-serif"> </span><font color="#7f7f7f" face="Arial, sans-serif" style="font-size:small">Energy Modeling Team Manager</font><br>
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<br><br><div class="gmail_quote">On Thu, Feb 6, 2014 at 7:10 AM, <span dir="ltr"><<a href="mailto:bfountain@greensim.com" target="_blank">bfountain@greensim.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
You cannot set that with range and approach. eQUEST calculates if the tower can carry the loop load for each timestep and if it can, the WSE is used. Otherwise the chiller is engaged.<br>
Brian Fountain<br>
<a href="mailto:bfountain@greensim.com">bfountain@greensim.com</a><br>
<div class="im HOEnZb"><br>
-----Original Message-----<br>
From: Sebastian Carrizo <<a href="mailto:juan.carrizo@alumni.carleton.ca">juan.carrizo@alumni.carleton.ca</a>><br>
Sender: <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a><br>
Date: Thu, 6 Feb 2014 09:59:58<br>
To: Neil Bulger<<a href="mailto:nbulger@integralgroup.com">nbulger@integralgroup.com</a>><br>
Cc: <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>><br>
Subject: Re: [Equest-users] Free cooling Chiller on eQuest<br>
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