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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Mike,<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'>Marrying typical infiltration metrics for envelope testing context, for load calculations, and for hourly energy simulations, is tricky at best. <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'>For layman’s context, 50Pa equates approximately to a “brisk” 20 mph head-on wind (<a href="https://www.youtube.com/watch?v=Jf5mCS6HYaI">https://www.youtube.com/watch?v=Jf5mCS6HYaI</a>), but pressurizing a building/space for ACH50 blower testing isn’t quite apples-to-apples with “natural” wind-driven conditions/infiltration. <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'>Here’s an idea for a “hack” that may be <i><u>good enough</u></i> to avoid a more sophisticated calculation/study – I’d welcome any discussion or suggested improvements:<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=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>0.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Open ASHRAE Fundamentals to find the page with this Sherman-Grimsrud model equation & associated tables in the ventilation & infiltration chapter (I found it on pg. 16.23 for Fundamentals-2009). To wit: this is originally intended for approximating low-rise residential whole-building infiltration:<o:p></o:p></span></p><p class=MsoListParagraph><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img border=0 width=156 height=34 id="_x0000_i1026" src="cid:image002.png@01D18AA0.44F8C6D0"></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Consider 0.6 ACH against your whole-building volume to come up with a whole-building infiltration flow rate (CFM) at those pressurization conditions (50Pa). <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Take 50Pa to equate to a 20mph average windspeed condition (U). You can go further if you like at this link: <a href="http://www.cactus2000.de/uk/unit/masswsp.shtml">http://www.cactus2000.de/uk/unit/masswsp.shtml</a><o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>With this “at testing conditions” infiltration/exfiltration rate (Q), leverage the S-G model equation to solve for “whole-building effective air leakage area” (A</span><span style='font-size:7.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>L</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>). You’ll have to make a few assumptions regarding indoor/outdoor temps at the time of testing (or assume temperature-driven infiltration is negligible at such high pressurization & zero that out) & also use the associated tables to look up appropriate coefficients for your building’s height / sheltering factors.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Plug that leakage area (A</span><span style='font-size:7.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>L</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>) back into the equation with a 10mph wind (U) to determine whole-building infiltration CFM (Q) at 10mph. <o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>5.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Now for your <i>spaces of interest</i>, apportion how much infiltration is occurring relative to the whole building by considering exposed area of envelope for those spaces in proportion to the total building envelope area. I’d isolate these areas to vertical envelope wall surfaces, and ignore roofs/floors for this apportioning effort as roof/floors would in a typical commercial case would be pretty airtight, hopefully. Q</span><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>SPACE</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> = Q</span><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>BLDG</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> * (AREA OF SPACE ENVELOPE / AREA OF BLDG ENVELOPE)<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>6.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Convert Q</span><span style='font-size:8.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>SPACE</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> to ACH @ 10mph for your SPACE inputs, and don’t specify (default out) INF-FLOW/AREA. This will allow your calculated infiltration to track during the simulation with hourly windspeed.<o:p></o:p></span></p><p class=MsoListParagraph><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'>This “hack” procedure ignores that spaces with more doors & operable windows are going to be relative “weak points” for infiltration in the big picture, but I reckon if applied uniformly should approximate relative infiltration rates on a building-wide level for different tested thresholds. This is probably “wrong” on other levels, but for your purposes might be good enough for relative before/after inputs to approximate energy savings. <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'>Depending on context, you might want to re-tool this suggestion to isolate to only individual space volumes, without stepping up/back from whole-building measurements. This however hinges on how the ACH50 requirement would be applied/measured/isolated to individual spaces of a building, an area I lack experience in… Perhaps someone can fill me/us in further on that front?<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'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>~Nick<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'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#3A7A46'>------------------------------------------------------------------------------------------------------------------------------<o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#3A7A46'>Nick Caton, P.E.</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#3A7A46'><o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=724 style='width:543.0pt;border-collapse:collapse'><tr><td width=230 valign=top style='width:172.3pt;padding:0in 0in 0in 0in'><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#626469'> Senior Energy Engineer</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br></span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#626469'> Energy and Sustainability Services</span><span 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align=right style='text-align:right'><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:#626469'>15200 Santa Fe Trail Drive<br>Suite 204<br>Lenexa, KS 66219<br>United States</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></td></tr><tr style='height:4.0pt'><td width=724 colspan=3 valign=top style='width:543.0pt;padding:0in 0in 0in 0in;height:4.0pt'><p class=MsoNormal style='mso-line-height-alt:4.0pt'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#3A7A46'><img border=0 width=722 height=49 id="Picture_x0020_3" src="cid:image001.png@01D18A85.DB98E950" alt="cid:image001.png@01D189AB.58634A10"></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#3A7A46'><o:p></o:p></span></p></td></tr></table><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'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Michael Campbell<br><b>Sent:</b> Wednesday, March 30, 2016 11:01 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Infiltration inputs<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Hello,<br><br><o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Hoping I can get a quick answer on this - I need to input 0.6 ACH50 into my energy model for certain spaces. What would be the appropriate way of inputting this into equest? I understand that infiltration in equest is based on a reference wind speed of 10MPH but how does that compare to a pressure differential of 50Pa?<o:p></o:p></p></div><div><p class=MsoNormal>Thanks,<o:p></o:p></p></div><div><p class=MsoNormal>Mike<o:p></o:p></p></div></div><p class=MsoNormal><br>______________________________________________________________________<br>This email has been scanned by the Symantec Email Security.cloud service.<br>______________________________________________________________________<o:p></o:p></p></div></body></html>