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<p class=MsoPlainText>Tim,<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Infiltration is something we need to model in the vast
majority of the buildings we simulate. <o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>There is a mass of empirical data that has gone behind
the tables provided in the CIBSE guides, which was mostly collected by both the
UK BRE and BSRIA. You could also try the AIVC which has a number of
publications on infiltration testing and in particular a useful book called
"Numerical Data for Air Infiltration and Natural Ventilation
Calculations" by Orme, Liddament & Wilson. It was reprinted with
amendments in 1998 and so is slightly old now, but it is a good starting point
for looking at the overall numbers to use and the basis for why. <o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>I think you should also try CIBSE Guide A which has some
useful tables on infiltration rates to use - an example and extract of which is
below (Part L denotes UK building regulations for energy consumption):<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=640
style='width:480.0pt;border-collapse:collapse'>
<tr style='height:29.2pt'>
<td width=213 valign=top style='width:160.0pt;border:solid white 1.0pt;
border-bottom:solid white 3.0pt;background:#2D2D8A;padding:3.6pt 7.2pt 3.6pt 7.2pt;
height:29.2pt'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:white'>Air Permeability </span></b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=427 colspan=2 valign=top style='width:320.0pt;border-top:solid white 1.0pt;
border-left:none;border-bottom:solid white 3.0pt;border-right:solid white 1.0pt;
background:#2D2D8A;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:29.2pt'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:white'>Infiltration Rate (ac/h) </span></b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
</tr>
<tr style='height:14.15pt'>
<td width=213 valign=top style='width:160.0pt;border:solid white 1.0pt;
border-top:none;background:#CDCDDA;padding:3.6pt 7.2pt 3.6pt 7.2pt;
height:14.15pt'></td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#CDCDDA;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:14.15pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Peak </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#CDCDDA;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:14.15pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Average</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
</tr>
<tr style='height:12.95pt'>
<td width=213 valign=top style='width:160.0pt;border:solid white 1.0pt;
border-top:none;background:#E8E8ED;padding:3.6pt 7.2pt 3.6pt 7.2pt;
height:12.95pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>20 (leaky) </span><span style='font-size:10.0pt;font-family:
"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#E8E8ED;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:12.95pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.95 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#E8E8ED;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:12.95pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.70 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
</tr>
<tr style='height:13.25pt'>
<td width=213 valign=top style='width:160.0pt;border:solid white 1.0pt;
border-top:none;background:#CDCDDA;padding:3.6pt 7.2pt 3.6pt 7.2pt;
height:13.25pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>10 (Part-L 2002) </span><span style='font-size:10.0pt;
font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#CDCDDA;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:13.25pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.50 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#CDCDDA;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:13.25pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.35 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
</tr>
<tr style='height:12.2pt'>
<td width=213 valign=top style='width:160.0pt;border:solid white 1.0pt;
border-top:none;background:#E8E8ED;padding:3.6pt 7.2pt 3.6pt 7.2pt;
height:12.2pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>7 (Part-L 2006) </span><span style='font-size:10.0pt;font-family:
"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#E8E8ED;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:12.2pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.35 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#E8E8ED;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:12.2pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.25 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
</tr>
<tr style='height:13.15pt'>
<td width=213 valign=top style='width:160.0pt;border:solid white 1.0pt;
border-top:none;background:#CDCDDA;padding:3.6pt 7.2pt 3.6pt 7.2pt;
height:13.15pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>5 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#CDCDDA;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:13.15pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.25 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#CDCDDA;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:13.15pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.20 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
</tr>
<tr style='height:12.75pt'>
<td width=213 valign=top style='width:160.0pt;border:solid white 1.0pt;
border-top:none;background:#E8E8ED;padding:3.6pt 7.2pt 3.6pt 7.2pt;
height:12.75pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>3 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#E8E8ED;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:12.75pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.15 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
<td width=213 valign=top style='width:160.0pt;border-top:none;border-left:
none;border-bottom:solid white 1.0pt;border-right:solid white 1.0pt;
background:#E8E8ED;padding:3.6pt 7.2pt 3.6pt 7.2pt;height:12.75pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>0.10 </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
</td>
</tr>
</table>
<p class=MsoPlainText>From CIBSE Guide A Table 4.13 for 2 storey 500m2
naturally ventilated offices, normal exposure<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Generally if you’ve got a cavity wall installation
the chances are the infiltration rates unless very well monitored for
construction quality will be considerably higher than for something like a
composite panel system. We see a lot of huge warehouse buildings that
have significantly lower infiltration rates than domestic dwellings (per m2)
because of the ease of constructing large warehouse with good detailing.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Hope this helps.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Paul<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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<td width=211 valign=top style='width:158.55pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal>Dr Paul Carey<o:p></o:p></p>
<p class=MsoNormal>BSc (Hons) PhD FRSA<o:p></o:p></p>
<p class=MsoNormal>Director<o:p></o:p></p>
<p class=MsoNormal>Low Carbon Energy Assessor<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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<td width=211 valign=top style='width:157.95pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal>Zero Energy Design Ltd<o:p></o:p></p>
<p class=MsoNormal>10A Portland Place<o:p></o:p></p>
<p class=MsoNormal>2-22 Mottram Road<o:p></o:p></p>
<p class=MsoNormal>Stalybridge<o:p></o:p></p>
<p class=MsoNormal>SK15 3AD<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>T: 0161 3386200<o:p></o:p></p>
<p class=MsoNormal>F: 0161 3031281<o:p></o:p></p>
<p class=MsoNormal>M: 0789 4098012<o:p></o:p></p>
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<p class=MsoNormal>E: paul@zed-uk.com<o:p></o:p></p>
<p class=MsoNormal>W: www.zed-uk.com<o:p></o:p></p>
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<p class=MsoPlainText><span lang=EN-US>-----Original Message-----<br>
From: bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] On Behalf Of Tim Johnson<br>
Sent: 09 June 2009 22:52<br>
To: bldg-sim@lists.onebuilding.org<br>
Subject: [Bldg-sim] Infiltration</span><o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>I have the task of evaluating the benefits of continuous
insulation compared to insulated wall cavities. The idea behind the
continuous insulation is partly that it will make a tighter building and not
allow as much infiltration. I realize that continuous insulation
eliminates the thermal break in the wall and I am able to quantify that, but I do
not know of a good way to quantify the difference in infiltration. Does
anyone know of studies that have been done on building infiltration? What
values do you normally use for new construction in your energy modeling?<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Thanks,<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Tim Johnson, EIT, LEED AP<o:p></o:p></p>
<p class=MsoPlainText>P: (208)577-5645<o:p></o:p></p>
<p class=MsoPlainText>F: (208)343-3531<o:p></o:p></p>
<p class=MsoPlainText>timj@ctagroup.com <o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>_______________________________________________<o:p></o:p></p>
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