<div dir="ltr"><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></div><div class="gmail_extra"><br><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><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="FR-CA" link="#0563C1" vlink="#954F72"><div><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><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Droid Serif","serif";color:black">Direction des secteurs résidentiel, institutionnel et des affaires</span><span><u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Droid Serif","serif";color:black">Bureau de l'efficacité et de l'innovation énergétiques<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Droid Serif","serif";color:black">Ministère des Ressources naturelles</span><span style="font-size:12.0pt;font-family:"Droid Serif","serif";color:black"><u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Droid Serif","serif";color:black">5700, 4e Avenue Ouest, B-406<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Droid Serif","serif";color:black">Québec (Québec) G1H 6R1<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Droid Serif","serif";color:black">Téléphone : 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<u></u></span></p><p class="MsoNormal"><b><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">AVIS DE CONFIDENTIALITÉ</span></b><span style="font-size:9.0pt;font-family:"Droid Serif","serif";color:black"><u></u><u></u></span></p><p class="MsoNormal" style="margin-right:0cm;margin-bottom:6.0pt;margin-left:35.4pt"><b><span lang="FR" style="font-size:7.5pt;font-family:"Arial","sans-serif";color:black">Ce message est confidentiel. 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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><p><span style="font-size:10pt;font-family:Arial,sans-serif;color:black;background-image:initial;background-repeat:initial"></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><br>Direct: 616.450.8653<br><a href="mailto:jim@buildingperformanceteam.com" target="_blank">jim@buildingperformanceteam.com</a><br><br><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><p align="center" style="margin-bottom:0in;margin-bottom:.0001pt;text-align:center"><b><i><span style="font-size:14.0pt;line-height:115%;font-family:"MS Reference Sans Serif","sans-serif""> </span></i></b><span style="font-family:"MS Reference Sans Serif","sans-serif""></span></p><p style="vertical-align:middle">
</p><p style="margin-bottom:6.0pt;text-autospace:none"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif"">Love
is the bridge over which Truth travels </span><br></p></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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