Hi Nick,<br><br>Do you have a reference for the ASHRAE ACH estiamtes you mentioned?<br><br>thanks!<br>Steve<br><br><div class="gmail_quote">On Mon, Mar 8, 2010 at 7:47 PM, Nick Caton <span dir="ltr"><<a href="mailto:ncaton@smithboucher.com">ncaton@smithboucher.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">I’ve done exactly that in
the past for the exactly the same purpose!</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">The only difference is I believe
I always punch in the differences in the metric of ACH. ASHRAE fundamentals
provides some guidance regarding air change rates to expect for various classes
of construction as a function of outdoor design temperature, and that was the
best I could base my existing construction off of from what info I had available.</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Come up with a “leakiness”
for both you construction, old and new windows, and do the weighted average jig
=).</span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Kudos on your fancy facade
spelling also ;)! </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">~Nick</span></p>
<div>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><img src="" alt="cid:489575314@22072009-0ABB" width="119" height="37"></span><b><span style="color: rgb(45, 77, 94);"></span></b></p>
<p class="MsoNormal"><b><span style="color: rgb(45, 77, 94);"> </span></b></p>
<p class="MsoNormal"><b><span style="color: rgb(45, 77, 94);">NICK CATON, E.I.T.</span></b><b><span style="font-size: 12pt; color: rgb(45, 77, 94);"></span></b></p>
<p class="MsoNormal"><span style="font-size: 7.5pt; color: rgb(204, 153, 0);">PROJECT ENGINEER</span><span style="font-size: 7.5pt; font-family: "Times New Roman","serif"; color: rgb(204, 153, 0);"></span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;">
<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Alex
Krickx<br>
<b>Sent:</b> Monday, March 08, 2010 6:05 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Modeling Infiltration and Windows</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Hello all,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I am interested in modeling the energy savings that occurs
when windows are replaced with lower-infiltration alternatives. In the wizard
mode, the only place that I see infiltration is under the “Building
Envelope Constructions” Screen. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I’m hoping someone can confirm my methodology:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Can I input a weighted average of window and wall air
infiltration here? If I’m looking at a building with 20% Window to
Wall Ratio, and the windows have 0.1 CFM/ft² while the walls have 0.04
CFM/ft²can I apply an area weighted average into this box? I would take
(20%*0.1+80%*0.04) as the <i>façade </i>infiltration value.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">That way I could use the same formula to determine the area
weighted infiltration of the façade if better windows were installed.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">How do other people model this?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks in advance!</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Alex Krickx</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size: 12pt; color: rgb(38, 47, 19);">Alex Krickx</span></p>
<p class="MsoNormal"><span style="font-size: 9pt; color: gray;">Building Energy
Specialist</span></p>
<p class="MsoNormal"><span style="font-size: 8pt; color: rgb(31, 73, 125);"><img src="" alt="email_sig" width="121" border="0" height="42"></span></p>
<p class="MsoNormal"><span style="font-size: 9pt;">1250 Elko Dr, Sunnyvale, CA
94089</span></p>
<p class="MsoNormal"><span style="font-size: 9pt;">(t) 408.541.8124</span></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Steve Clark, MS PhD RESNET BPI ITC<br>ClarkEnergyConsultants.com<br>484.477.7525<br><br><br>