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<p>Leaving air is indeed the air stream leaving the cooling coil.</p>
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<p>In my experience, most OA economizers are not set this aggressively in the field because of problems with cold spots.</p>
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David Berty P.E.</div>
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Baseline Energy Consulting<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Bldg-sim <bldg-sim-bounces@lists.onebuilding.org> on behalf of Jim Dirkes <jim@buildingperformanceteam.com><br>
<b>Sent:</b> Monday, November 23, 2015 4:15 PM<br>
<b>To:</b> Julien.Dutel@mern.gouv.qc.ca<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] 90.1 - leaving air temperature (DX cooling / Economizer)</font>
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<div class="gmail_default" style="font-size:large; color:#b45f06">Without looking at the 90.1 definitions pages (though I recommend that), the meaning should be the temperature leaving the cooling coil, since that is what might freeze.</div>
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<div class="gmail_quote">2015-11-23 16:11 GMT-05:00 <span dir="ltr"><<a href="mailto:Julien.Dutel@mern.gouv.qc.ca" target="_blank">Julien.Dutel@mern.gouv.qc.ca</a>></span>:<br>
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<p class="MsoNormal"><span style="font-family:"Droid Serif","serif"">Hello,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Droid Serif","serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-family:"Droid Serif","serif"">Section 6.5.1.3 of 90.1-2013, requires that the “outdoor air damper does not begin to close to prevent coil freezing due to minimum compressor run time until the leaving air temperature
is less than 45°F” <u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-family:"Droid Serif","serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-family:"Droid Serif","serif"">1) I’m not an expert with refrigeration system, and I want make sure that I have the good interpretation of what is the “leaving air” .<u></u><u></u></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span lang="EN-CA" style="font-family:"Droid Serif","serif"">A) “Leaving air” is the mixed air (outside air + return air) that leaves the evaporator coil of a DX cooling system, so it’s pretty much equivalent
to the supply air. <u></u><u></u></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span lang="EN-CA" style="font-family:"Droid Serif","serif"">B) “Leaving air” is the air leaving the outdoor air damper, so it’s equivalent to the outside air.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-family:"Droid Serif","serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-family:"Droid Serif","serif"">2) If the answer is A, based on your experience in the field, have you notice any comfort problem by supplying air at 45°F when the unit setpoint is typically at 55°F ?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-family:"Droid Serif","serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-family:"Droid Serif","serif"">Many thanks,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-family:"Droid Serif","serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-family:"Droid Serif","serif"; color:green">Julien Dutel,</span></b><span style="font-family:"Droid Serif","serif"; color:green"> ing., CEM, CMVP<b>.<u></u><u></u></b></span></p>
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<p><span style="font-size:10pt; font-family:Arial,sans-serif; color:black"></span></p>
James V Dirkes II, PE, BEMP, LEED AP<br>
CEO/President<br>
The Building Performance Team Inc.<br>
1631 Acacia Dr, GR, Mi 49504<br>
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Direct: 616.450.8653<br>
<a href="mailto:jim@buildingperformanceteam.com" target="_blank">jim@buildingperformanceteam.com</a><br>
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<a href="http://buildingperformanceteamcom" target="_blank">Website </a>l <a href="https://www.linkedin.com/pub/jim-dirkes/7/444/413" target="_blank">LinkedIn</a>
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