<div dir="ltr">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.<div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">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:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Dear All,</p>
<p>eQuest allows inputing of infiltration airflow as CFM/ft2 (of
indoor space in detailed mode) for every zone.</p>
<p>I have calculated CFM/ft2 values for each zone in my model, but
this calculation has been done for a outside - inside pressure
difference of 50 Pa. Or I can do the calculation for any arbitrary
pressure difference. <br>
</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.<br>
</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?</p>
<p>Thank you,</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>
</p>
<p><img src="cid:17691621a9ad54b41ba1" width="300" height="120"></p>
<p><br>
</p>
</div>
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