<div dir="ltr">Looking into infiltration on a leaky building, and thought I'd check out that reference link Brian referenced (see Brian's response below) in an earlier post, and found the link has moved to <a href="https://sbcanada.org/wp-content/uploads/2022/04/Air-tightness-Energy-Modelling-for-Part-3-Buildings.pdf">https://sbcanada.org/wp-content/uploads/2022/04/Air-tightness-Energy-Modelling-for-Part-3-Buildings.pdf</a>. If anyone was looking for that document, I believe this is where it lives now.<div><div><br><div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 28, 2020 at 7:14 PM Nicholas Caton via Equest-users <<a href="mailto:equest-users@lists.onebuilding.org">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">
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">Well stated Brian!<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">An extra anecdote/caution:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">Brian’s sentiment expressed here – that pressures typical of blower door testing for envelope leakage are
<u>atypical</u> for those found caused naturally through wind pressures and other forces for infiltration/exfiltration, is correct. Most of the time.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">If however you are tuning a model expressly to evaluate measures specifically affecting infiltration, be mindful that nature likes to play outside the box sometimes. I was
tuning a specific laboratory building with extremely leaky glazing (partly because the building was a mechanical vacuum cleaner, mostly because the glazing was original to the building, nearly 70 years old), and was utilizing AMY weather to assist with a particularly
weather-sensitive and touchy calibration process. That historical weather period coincidentally proved invaluable for this exercise, in part because the calibration period it contained some fairly extreme weather events… Some wacky looking windspeeds in the
Spring caused me to google for climactic (?) events in this locality (Illinois), and I found just cause for the resulting extreme external building pressurization/infiltration: tornadoes!
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">Quick takeaway:
<u></u><u></u></span></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="gmail-m_-2687445463529472324MsoListParagraph" style="margin-left:0in"><span style="font-size:11pt;font-family:Calibri,sans-serif">While blower door testing is indeed pretty darn extreme in the context of “normal” conditions – nothing is more extreme
than mother nature =). <u></u><u></u></span></li><li class="gmail-m_-2687445463529472324MsoListParagraph" style="margin-left:0in"><span style="font-size:11pt;font-family:Calibri,sans-serif">This also adds a little perspective on the concerns I hear raised occasionally on the idea that blower door testing
with existing/aged facilities can harm with respect to building envelope performance… even if true, it’s nothing in comparison with Midwest weather events of this nature!<u></u><u></u></span></li></ol>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif">~Nick<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif"> </span><span style="font-size:11pt;font-family:Arial,sans-serif;color:rgb(58,122,70)"><img border="0" width="624" height="8" style="width: 6.5in; height: 0.0833in;" id="gmail-m_-2687445463529472324image010.jpg_x0040_01D6B128.239DA330" src="cid:181d010df375b006a1"></span><span style="font-size:10.5pt;font-family:"Yu Gothic",sans-serif"><u></u><u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span style="font-size:11pt;font-family:Calibri,sans-serif"> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>>
<b>On Behalf Of </b>Brian Fountain via Equest-users<br>
<b>Sent:</b> Thursday, December 24, 2020 8:29 AM<br>
<b>To:</b> Omer Moltay <<a href="mailto:omoltay@mimtarch.com" target="_blank">omoltay@mimtarch.com</a>><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] eQuest Infiltration Modeling as Airflow (CFM/ft2)<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p><span style="color:red">[External email: Use caution with links and attachments]</span><u></u><u></u></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">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.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><img border="0" width="1324" height="90" style="width: 13.7916in; height: 0.9375in;" id="gmail-m_-2687445463529472324Picture_x0020_3" src="cid:181d010df39855d354" alt="cid:image005.png@01D6D959.0CBDCB50"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">(from eQUEST/DOE-2.2 help)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">To convert the tested leakage rate (n<sub>50</sub>) at 50 Pa to the ambient 5 Pa use the formula below …
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><img border="0" width="933" height="161" style="width: 9.7187in; height: 1.677in;" id="gmail-m_-2687445463529472324_x0000_i1027" src="cid:181d010df399374b65" alt="cid:image006.png@01D6D959.0CBDCB50"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Formula taken from an excellent white paper on modelling infiltration by RWDI available here:</span>
<span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsbcanada.org%2Fwp-content%2Fuploads%2F2017%2F04%2FAir-tightness-Energy-Modelling-for-Part-3-Buildings.pdf&data=04%7C01%7CNicholas.Caton%40se.com%7Cd28d7a6799bb44a0242508d8a79a8c2d%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C637443629515267558%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=yfhNqxEK1TFs9BEcpDWhRH2SIooG8uDkCV1loWkV2ew%3D&reserved=0" target="_blank">https://sbcanada.org/wp-content/uploads/2017/04/Air-tightness-Energy-Modelling-for-Part-3-Buildings.pdf</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Brian<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
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<p class="MsoNormal" style="margin-bottom:12pt;line-height:105%"><b><span style="font-family:Arial,sans-serif;color:rgb(0,98,152)">Footprint<br>
<br>
</span></b><b><span style="font-size:10pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(0,98,152)">Brian Fountain</span></b><span style="font-size:9pt;line-height:105%;font-family:Arial,sans-serif;color:rgb(61,57,53)"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span style="font-size:11pt;font-family:Calibri,sans-serif"> Equest-users <<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>>
<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 <<a href="mailto:omoltay@mimtarch.com" target="_blank">omoltay@mimtarch.com</a>><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Spam released by Allowed List] Re: [Equest-users] eQuest Infiltration Modeling as Airflow (CFM/ft2)<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">CAUTION: EXTERNAL SENDER <u></u><u></u></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.
<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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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:<u></u><u></u></p>
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<p>Dear All,<u></u><u></u></p>
<p>eQuest allows inputing of infiltration airflow as CFM/ft2 (of indoor space in detailed mode) for every zone.<u></u><u></u></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.
<u></u><u></u></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.<u></u><u></u></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?<u></u><u></u></p>
<p>Thank you,<u></u><u></u></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>
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