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<font size="+1">Since 1922!<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
ASHRAE </font><font size="+1">Member</font><br>
<br>
On 09/08/2011 06:11 PM, lawrence Lile wrote:
<blockquote
cite="mid:CABtC3mY+ntx-+RhTAM22SxmEFTX2LvsKmVZ=YAtMtywTy+9EpA@mail.gmail.com"
type="cite">Good ol ASHRAE Fundamentals! Why didn't I think of
looking there? Thanks!
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<div class="gmail_quote">On Mon, Aug 8, 2011 at 11:36 AM, Nick
Caton <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:ncaton@smithboucher.com">ncaton@smithboucher.com</a>></span>
wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D">Hi Lawrence,</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D">My copy of
ASHRAE Principles of HVAC includes a table (5-1)
excerpted from ASHRAE Fundamentals, 2001 (Table 7,
Ch 28). This table provides air change rates as a
function of subjective envelope airtightness
(“tight” / “medium” / “loose”) and as a function of
the outdoor design temperature. Upon reviewing the
referenced Fundamentals chapter, I learned this
table is built from research surveying residential
homes of various vintages, so it helps to know that
these are “tight” to “loose” residential
constructions. </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D">In any case,
I’ve used and cited this resource before when
modeling infiltration and calculating sizing loads
for non-residential projects as well. I’ve
searched, but have yet to come up with an equivalent
table based on surveying and measuring commercial
constructions from a subjective/objective
standpoint… That might be handier, but in the
meantime this is a good tool for “converting” your
subjective observations into the right ballpark. </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D">~Nick</span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D"><img
src="cid:part1.02070102.09000100@bellnet.ca"
alt="cid:489575314@22072009-0ABB" height="37"
width="119"></span><b><span
style="font-size:11.0pt;color:#2D4D5E"></span></b></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;color:#2D4D5E"> </span></b></p>
<p class="MsoNormal"><b><span style="color:#2D4D5E">NICK
CATON, P.E.</span></b><b><span
style="color:#2D4D5E"></span></b></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;color:#CC9900">SENIOR
ENGINEER</span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;color:#CC9900"> </span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#2D4D5E">Smith &
Boucher Engineers</span><span
style="font-size:7.5pt;color:#CC9900"></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#2D4D5E">25501 west
valley parkway, suite 200</span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#2D4D5E">olathe, ks
66061</span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#2D4D5E">direct <a
moz-do-not-send="true" href="tel:913.344.0036"
value="+19133440036" target="_blank">913.344.0036</a></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#2D4D5E">fax <a
moz-do-not-send="true" href="tel:913.345.0617"
value="+19133450617" target="_blank">913.345.0617</a></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D"><a
moz-do-not-send="true"
href="http://www.smithboucher.com"
title="blocked::www.smithboucher.com"
target="_blank"><span
style="font-size:10.0pt;color:blue">www.smithboucher.com</span></a></span><u><span
style="font-size:10.0pt;color:blue"> </span></u><span
style="font-size:11.0pt;color:#1F497D"></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;color:#1F497D"> </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">From:</span></b><span
style="font-size:10.0pt"> <a
moz-do-not-send="true"
href="mailto:equest-users-bounces@lists.onebuilding.org"
target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a moz-do-not-send="true"
href="mailto:equest-users-bounces@lists.onebuilding.org"
target="_blank">equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>lawrence Lile<br>
<b>Sent:</b> Sunday, August 07, 2011 12:50 PM</span></p>
<div class="im"><br>
<b>To:</b> <a moz-do-not-send="true"
href="mailto:equest-users@lists.onebuilding.org"
target="_blank">equest-users@lists.onebuilding.org</a><br>
</div>
<div class="im"><b>Subject:</b> [Equest-users] Basic
stuff - Infiltration</div>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal">In building modeling programs one
always has to provide precise values for
infiltration. In the real world, I will know one of
two things: almost nothing (The building appears to
be kinda leaky with old windows), or I will have a
blower door test done at a specific pressure. How
do I convert subjective ("kinda leaky") or objective
(Blower door test) leakage into numbers that make
sense in the program? Is there a guide one can
use? </p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal"> </p>
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<p class="MsoNormal">--Lawrence</p>
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