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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">50 Pa is too high a pressure difference to use for entry into eQUEST – regardless of whether you use ACH or cfm/area. That is a testing pressure differential
rather than the ambient pressure differential created by the reference wind speed of 10 mph (4.47 m/s). Ambient wind corresponds to a pressure differential of ~5 Pa. Using the n<sub>50</sub> flow rate would considerably overstate your infiltration load.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img width="1324" height="90" style="width:13.7916in;height:.9375in" id="Picture_x0020_3" src="cid:image005.png@01D6D959.0CBDCB50" alt="cid:image005.png@01D6D959.0CBDCB50"></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">(from eQUEST/DOE-2.2 help)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">To convert the tested leakage rate (n<sub>50</sub>) at 50 Pa to the ambient 5 Pa use the formula below …
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img width="933" height="161" style="width:9.7187in;height:1.677in" id="_x0000_i1027" src="cid:image006.png@01D6D959.0CBDCB50" alt="cid:image006.png@01D6D959.0CBDCB50"></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Formula taken from an excellent white paper on modelling infiltration by RWDI available here:</span>
<span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://sbcanada.org/wp-content/uploads/2017/04/Air-tightness-Energy-Modelling-for-Part-3-Buildings.pdf">https://sbcanada.org/wp-content/uploads/2017/04/Air-tightness-Energy-Modelling-for-Part-3-Buildings.pdf</a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Brian<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:105%"><b><span style="font-family:"Arial",sans-serif;color:#006298">Footprint<br>
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</span></b><b><span style="font-size:10.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#006298">Brian Fountain</span></b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#3D3935"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Mark Stout via Equest-users<br>
<b>Sent:</b> December 23, 2020 4:03 PM<br>
<b>To:</b> Omer Moltay <omoltay@mimtarch.com><br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Spam released by Allowed List] Re: [Equest-users] eQuest Infiltration Modeling as Airflow (CFM/ft2)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">CAUTION: EXTERNAL SENDER <o:p></o:p></p>
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<p class="MsoNormal">I would use ACH and base it on -50 Pa and the standards the AHJ has set. For example, IECC sets some zones to 3 ACH, but the AHJ may/can/do override that and may up it to 5 ACH. Then you just work backwards to arrive at ACH, e.g. the
formula for CFM is (5 ACH ÷ 60 Minutes) x Volume = CFM50. Now you know what your max infiltration.
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<p class="MsoNormal">On Wed, Dec 23, 2020 at 12:50 PM Omer Moltay via Equest-users <<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>> wrote:<o:p></o:p></p>
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<p>Dear All,<o:p></o:p></p>
<p>eQuest allows inputing of infiltration airflow as CFM/ft2 (of indoor space in detailed mode) for every zone.<o:p></o:p></p>
<p>I have calculated CFM/ft2 values for each zone in my model, but this calculation has been done for an outside - inside pressure difference of 50 Pa. Or I can do the calculation for any arbitrary pressure difference.
<o:p></o:p></p>
<p>The question is, since infiltration is very much pressure dependent, what pressure difference does eQuest assume when the infiltration airflow input is utilized? I know that it will not take into account the dynamic changes in pressure dif. during the simulation
due to wind effect or other effects, but I just want to be able to input a reasonable value since a calculated infiltration at 50 Pa is very different from say, at 5 Pa. The answer is of course, at whatever pressure difference the zone is anticipated to be
operating, so what would you recommend for low-rise commercial buildings? Or any other guidance would be appreciated.<o:p></o:p></p>
<p>Or should I convert my calculated values to ACH and use that input, as that takes into account wind speed changes? Again, what is the reference pressure dif. to use there?<o:p></o:p></p>
<p>Thank you,<o:p></o:p></p>
<p>Ömer Moltay, LEED AP BD+C, ASHRAE BEMP, ASHRAE CPMP<br>
Mimta EcoYapi, LEED Proven Provider<br>
Hekimsuyu Cad. 559. Sk.<br>
No:39 34255 Kucukkoy Istanbul Turkey<br>
Tel: 90-212-617-2296<br>
Fax: 90-212-617-2297<br>
Mobile: 90-533-957-1394<br>
<a href="http://www.eco-yapi.com" target="_blank">www.eco-yapi.com</a><br>
<a href="http://www.buildingenergymodels.com/" target="_blank">www.buildingenergymodels.com</a>
<o:p></o:p></p>
<p><img border="0" width="300" height="120" style="width:3.125in;height:1.25in" id="Picture_x0020_1" src="cid:image001.png@01D6D955.0DF3FE30" alt="cid:image001.png@01D6D955.0DF3FE30"><o:p></o:p></p>
<p><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Kind Regards,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Mark Stout, President<br>
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