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<p class="MsoNormal"><span style="color:#1F497D">Yes, uneven airflows complicate things, and can be used by manufacturers to game the system. There are other considerations, such as how to treat the heat gains from fan motors. (Inefficient fans add more heat
to the airstream(s), which can benefit the wintertime effectiveness but use more fan energy.) Passive House has been looking at this closely:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="http://www.phius.org/NAPHC2014/Semmelhack-HRV-presentation.pdf">http://www.phius.org/NAPHC2014/Semmelhack-HRV-presentation.pdf</a><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">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Keith Swartz [mailto:KSwartz@seventhwave.org] <br>
<b>Sent:</b> Monday, May 22, 2017 11:18 AM<br>
<b>To:</b> Bishop, Bill <bbishop@pathfinder-ea.com><br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] ASHRAE 90.1 ERV 50% energy recovery effectiveness - eQUEST inputs?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Bill,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Yes, Equation 6-J of the 2010 User’s Manual (p. 6-107) is the same equation that I referenced.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I noticed that the equation does not have the correction factor for unequal airflows, which is the “monkey wrench” I had in mind to caution against. Several manufacturers include
this factor in their effectiveness calculation. The graphic below is from a presentation by Trane.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><img border="0" width="245" height="102" id="Picture_x0020_1" src="cid:image012.jpg@01D2D2EE.6C00B200"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Usually the exhaust air flow is lower than the outside air flow due to building pressurization.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">So when should the flow ratio be applied? Any manufacturers or 90.1 committee members want to chime in?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Keith Swartz, PE
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:gray">|
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:110%"><b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:black">Seventhwave</span></b><b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:gray"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:110%"><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:black">608.210.7123 seventhwave.org<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Bishop, Bill [<a href="mailto:bbishop@pathfinder-ea.com">mailto:bbishop@pathfinder-ea.com</a>]
<br>
<b>Sent:</b> Monday, May 22, 2017 9:05 AM<br>
<b>To:</b> Keith Swartz <<a href="mailto:KSwartz@seventhwave.org">KSwartz@seventhwave.org</a>><br>
<b>Subject:</b> RE: [Equest-users] ASHRAE 90.1 ERV 50% energy recovery effectiveness - eQUEST inputs?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks Keith. I don’t have the 2013 User’s Manual but the 2010 version has an equation that is just basically the difference in enthalpies between airstreams. Is that what equation 6-K is? My question would still
remain – how to model that in eQUEST?<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>
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<p class="MsoNormal"><b>From:</b> Keith Swartz [<a href="mailto:KSwartz@seventhwave.org">mailto:KSwartz@seventhwave.org</a>]
<br>
<b>Sent:</b> Monday, May 22, 2017 9:39 AM<br>
<b>To:</b> Bishop, Bill <<a href="mailto:bbishop@pathfinder-ea.com">bbishop@pathfinder-ea.com</a>>;
<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> RE: [Equest-users] ASHRAE 90.1 ERV 50% energy recovery effectiveness - eQUEST inputs?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Bill,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">For all practical purposes, I also simply set the sensible and latent effectivenesses to 50%. If your energy model will get thorough scrutiny, you may want to use Equation 6-K
in the User’s Manual, 2013 edition.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Keith Swartz, PE
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:gray">|
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:110%"><b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:black">Seventhwave</span></b><b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:gray"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:110%"><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:black">608.210.7123 seventhwave.org<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Lapierre, Patrick via Equest-users [<a href="mailto:equest-users@lists.onebuilding.org">mailto:equest-users@lists.onebuilding.org</a>]
<br>
<b>Sent:</b> Thursday, May 18, 2017 11:57 AM<br>
<b>To:</b> Bishop, Bill <<a href="mailto:bbishop@pathfinder-ea.com">bbishop@pathfinder-ea.com</a>><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] ASHRAE 90.1 ERV 50% energy recovery effectiveness - eQUEST inputs?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="color:#1F497D">It is my interpretation as well and what I always do.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CA" style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><a href="http://www.bpa.ca/" target="''"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:blue;text-decoration:none"><img border="0" width="34" height="31" id="_x0000_i1026" src="cid:image013.jpg@01D2D2EE.6C00B200" alt="Bouthillette Parizeau"></span></a><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial Black",sans-serif;color:#3F3F3F">Patrick</span></b><b><span style="font-size:10.0pt;font-family:"Arial Black",sans-serif;color:#1F497D"> </span></b><b><span style="font-size:10.0pt;font-family:"Arial Black",sans-serif;color:#3F3F3F">Lapierre</span></b><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#7D7D7D">_ing.
BEMP</span></b><b><span style="font-size:10.0pt;font-family:"Arial Black",sans-serif;color:#1F497D"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#A5A5A5"><a href="mailto:plapierre@bpa.ca">plapierre@bpa.ca</a> | t: 5143833747x2807<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="FR-CA" style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#BFBFBF"> </span><span lang="FR-CA" style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="FR">De :</span></b><span lang="FR"> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>De la part de</b> Bishop, Bill via Equest-users<br>
<b>Envoyé :</b> 18 mai 2017 12:53<br>
<b>À :</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Objet :</b> [Equest-users] ASHRAE 90.1 ERV 50% energy recovery effectiveness - eQUEST inputs?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="FR-CA"><o:p> </o:p></span></p>
<p class="MsoNormal">I’d appreciate some sensible guidance. Please don’t dampen my spirits…<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Section 6.5.6.1 describes that required energy recovery systems (ERVs) “shall have at least 50% energy recovery effectiveness”, meaning “a change in enthalpy of the outdoor air supply equal to 50% of the difference between the outdoor air
and return air enthalpies at design conditions”.<o:p></o:p></p>
<p class="MsoNormal">My reaction is to model this by setting both the sensible and latent effectiveness (ERV-SENSIBLE-EFF and ERV-LATENT-EFF) to 50% (0.50).<o:p></o:p></p>
<p class="MsoNormal">Is this correct?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Ye be thanked,<o:p></o:p></p>
<p class="MsoNormal">~Bill<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<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" style="line-height:105%"><b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></b></p>
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