<div>A good rule-of-thumb assumption for any new construction is ACH=0.20. I believe this is based on an ASHRAE reference. For existing building construction it can be slightly higher than that up to significantly higher depending on the construction type and age of the building.</div>
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<div>Generally for new construction 0.20 is a good solid assumption.</div>
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<div>pk<br></div>
<div class="gmail_quote">On Mon, Mar 8, 2010 at 6:06 PM, steve clark <span dir="ltr"><<a href="mailto:scstevemclark@gmail.com">scstevemclark@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">Hi Nick,<br><br>Do you have a reference for the ASHRAE ACH estiamtes you mentioned?<br><br>thanks!<br>Steve<br>
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<div class="h5">On Mon, Mar 8, 2010 at 7:47 PM, Nick Caton <span dir="ltr"><<a href="mailto:ncaton@smithboucher.com" target="_blank">ncaton@smithboucher.com</a>></span> wrote:<br></div></div>
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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>
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<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="COLOR: rgb(45,77,94); FONT-SIZE: 12pt"></span></b></p>
<p class="MsoNormal"><span style="COLOR: rgb(204,153,0); FONT-SIZE: 7.5pt">PROJECT ENGINEER</span><span style="FONT-FAMILY: 'Times New Roman','serif'; COLOR: rgb(204,153,0); FONT-SIZE: 7.5pt"></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>
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<p class="MsoNormal">Hello all,</p>
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<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>
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<p class="MsoNormal">Alex Krickx</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="COLOR: rgb(38,47,19); FONT-SIZE: 12pt">Alex Krickx</span></p>
<p class="MsoNormal"><span style="COLOR: gray; FONT-SIZE: 9pt">Building Energy Specialist</span></p>
<p class="MsoNormal"><span style="COLOR: rgb(31,73,125); FONT-SIZE: 8pt"><img border="0" alt="email_sig" width="121" height="42"></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 9pt">1250 Elko Dr, Sunnyvale, CA 94089</span></p>
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