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<p class="MsoNormal">I have been applying the ASHRAE 0.4 cfm/ft<sup>2</sup> air leakage as follows, with a formula for AIR-CHANGES/HR and an alternate infiltration schedule.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The methodology in 90.1 Appendix G applies a multiplier of 0.112, giving 0.0448 cfm/ft<sup>2</sup> (halfway between the 0.04 and 0.05 that Daric has been using). However, while the default infiltration in eQUEST is applied to above-ground
exterior walls only, 90.1 applies it to the whole building envelope, “including the lowest floor, any below-grade walls or above-grade walls, and roof”. So you end up with a larger value for calculated infiltration cfm, which you then apply as air changes/hour
in eQUEST. (You could also apply it as cfm per floor area as INF-FLOW/AREA, but AIR-CHANGES/HR should be preferred because it has a correction for wind speed relative to the ASHRAE-referenced 10 mph.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Additionally, there is some guidance from PNNL-18898 Infiltration Modeling Guidelines to use an infiltration schedule fraction of 1.0 when HVAC systems are off and 0.25 when HVAC systems are in operation. This differs from the default eQUEST
infiltration schedule. (Special thanks to Maria Karpman of Karpman Consulting for sharing this guidance.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The Appendix G methodology can be applied using an INF-METHOD of AIR-CHANGE and the following expression for AIR-CHANGES/HR, where the values for area and volume will vary per model, and the air leakage rate is defined using a parameter
with a value of 0.4 or some other value for a parametric run:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">/* Based on 90.1 G3.1.1.4 method with<o:p></o:p></p>
<p class="MsoNormal">46134 pressure boundary area, LV-D Building Window+Wall<o:p></o:p></p>
<p class="MsoNormal">and V=356358 building total volume, LV-B.<o:p></o:p></p>
<p class="MsoNormal">Air leakage is 0.4 cfm/ft2 per Table G3.1 or<o:p></o:p></p>
<p class="MsoNormal">0.08 cfm/ft2 per PHIUS. */<o:p></o:p></p>
<p class="MsoNormal">switch (#SV(#L("INF-METHOD")))<o:p></o:p></p>
<p class="MsoNormal"> case 0 : unused<o:p></o:p></p>
<p class="MsoNormal"> case 1 : 0.112*#PA("Air Leakage")*46134*60/356358<o:p></o:p></p>
<p class="MsoNormal"> case 2 : unused<o:p></o:p></p>
<p class="MsoNormal"> case 3 : unused<o:p></o:p></p>
<p class="MsoNormal"> case 4 : unused<o:p></o:p></p>
<p class="MsoNormal"> default : unused<o:p></o:p></p>
<p class="MsoNormal">endswitch<o:p></o:p></p>
<p class="MsoNormal"><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<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D">134 South Fitzhugh Street<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Daric Adair via Equest-users<br>
<b>Sent:</b> Wednesday, October 28, 2020 9:39 AM<br>
<b>To:</b> Phil Jordan <phil.jordan@clearesult.com>; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] eQUEST infiltration rate<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The 0.038 cfm/ft2 is the Wizard Default. We typically override it to a higher value, but not to 0.4 cfm/sf. That’s at a pressure well above typical building pressurization. We’ve used 0.04 and 0.05 in the past with no questions asked. ASHRAE
90.1-2016 G3.1.1.4 has defined a method to determine the infiltration rate.<o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal" style="background:white"><b><span style="font-family:"Arial",sans-serif;color:#383A35;text-transform:uppercase">DARIC ADAIR</span></b><span style="font-size:7.0pt;font-family:"Arial",sans-serif;color:#383A35;text-transform:uppercase"> PE,
CEM, BEMP</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#383A35"><br>
Mechanical Engineer, Energy Analyst<br>
<br>
</span><span style="color:black"><a href="https://www.hendersonengineers.com/?utm_source=hei&&utm_medium=email&&utm_campaign=hei-shortsignature"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#008C15;text-transform:uppercase">HENDERSON
ENGINEERS</span></b></a></span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#383A35"><br>
<a href="mailto:daric.adair@hendersonengineers.com"><span style="color:#383A35">daric.adair@hendersonengineers.com</span></a><br>
<br>
</span><b><span style="font-size:7.0pt;font-family:"Arial",sans-serif;color:#383A35;text-transform:uppercase">LICENSED IN</span></b><span style="font-size:7.0pt;font-family:"Arial",sans-serif;color:#383A35;text-transform:uppercase"> KS</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Phil Jordan <<a href="mailto:phil.jordan@clearesult.com">phil.jordan@clearesult.com</a>>
<br>
<b>Sent:</b> Monday, October 26, 2020 11:15 AM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] eQUEST infiltration rate<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is that the default the wizard uses? I believe it’s been 0.4 cfm/ft2 (@ 0.3 in. of water) for the past few cycles of 90.1 at least (Section 5.4.3).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#005E68">Phil Jordan</span></b><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b>From:</b> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Lapierre, Patrick via Equest-users<br>
<b>Sent:</b> Monday, October 26, 2020 9:09 AM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] eQUEST infiltration rate<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><strong><span lang="FR-CA" style="font-family:"Calibri",sans-serif;color:maroon">EXTERNAL email. Please exercise caution. This e-mail is from a sender outside of CLEAResult. Do not click any links or open any attachments from unknown senders
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<p class="MsoNormal"><span lang="FR-CA">Hello all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CA"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Does anyone remember where in ASHRAE is referenced the default value for infiltration (0.38 cfm/ft2) that eQUEST uses?</span><span lang="FR-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">I can’t seem to trace it back, yet I’m pretty sure it comes from ASHRAE.</span><span lang="FR-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> </span><span lang="FR-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA">Thank you,</span><span lang="FR-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA"> </span><span lang="FR-CA"><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;mso-fareast-language:FR-CA">Patrick</span></b><b><span style="font-size:10.0pt;font-family:"Arial Black",sans-serif;mso-fareast-language:FR-CA"> <span style="color:#3F3F3F">Lapierre</span></span></b><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#7D7D7D;mso-fareast-language:FR-CA">_ing.
BEMP, Chargé de projets</span></b><o:p></o:p></p>
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