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<p class="MsoNormal"><span style="color:#1F497D">Peter,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The model looks sound and I don’t see any “oops” inputs so quick QC looks okay.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Several things are going on that can minimize the benefit of heat recovery:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Oregon weather file with peak heating load at 34F<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Modest ventilation requirement with roughly 20% OA<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Low ventilation hours (2600 hrs/year)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">High (?) infiltration rate (0.7 ACH) representing 1/3 of your heating load for system sizing<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Efficient boiler<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">BOILER: MIN-RATIO = 0; START-UP-TIME = 0; STANDBY-TIME = 0 which totally eliminates cycling and standby losses<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black">William Bishop, PE, BEMP, BEAP, CEM, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black"> Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="color:#1F497D">\</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Peter Reppe, CPHC, LEED AP via Equest-users<br>
<b>Sent:</b> Friday, June 10, 2016 4:47 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Heat recovery ventilation<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi folks, <o:p></o:p></p>
<p class="MsoNormal">In double-checking the savings numbers from ventilation air heat recovery on my straight-forward VAV system, I noticed that the heating savings are less than half what I’d expect (based on back-of-the-envelope QC). I’m now out of ideas
where to look for input errors, and am rather frustrated to see this happen on a pretty standard VAV system…
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Would someone here have a moment and take a look, please (when running it, please use parametric run 4)? I’d appreciate any feedback.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks much!!!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#1F497D">Peter Reppe, LEED AP, CPHC<o:p></o:p></span></b></p>
<p class="MsoNormal"><i><span style="font-family:"Arial",sans-serif;color:#1F497D">Energy Analyst<o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><img border="0" width="19" height="19" id="Picture_x0020_1" src="cid:image008.jpg@01D1C346.595AB960" alt="cid:image003.jpg@01CE44D4.DD6A74A0"></span><b><span style="color:#17365D">Systems West Engineers<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black">p. 541.342.7210<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black">Our website has been renovated! See what’s new at
<a href="http://www.systemswestengineers.com/"><span style="color:blue">www.systemswestengineers.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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