<div>Hi Paul, </div>
<div> </div>
<div>Probably I did not really understand your question. But my understanding is that R values of building assemblies will be mainly used for conductive calculation while air leakage rate through assemblies will be involved in convective one. In this case, there is no modulated result reflected the combined effect of the two parameters. Instead, they are represented respectively in the simulation results. </div>
<div> </div>
<div>Cheers, </div>
<div>Cheney <br></div>
<div class="gmail_quote">On Wed, Oct 13, 2010 at 2:31 PM, Paul Grahovac <span dir="ltr"><<a href="mailto:paul.grahovac@prosoco.com">paul.grahovac@prosoco.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div lang="EN-US" vlink="purple" link="blue">
<div>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt">I am not a modeler, but I’ve worked a bit with the TRANE Trace demo software a few years ago.</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt">I’ve forgotten how to maneuver within it, so I was hoping someone might comment on this question.</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt">The software provided an air leakage rate for whatever wall assembly is entered into the model.</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt">I know from previous posts and responses that you do not change the air leakage rate to account for any air barrier system that is to be installed. I also know that if you do apply an air barrier leakage rate, the model is very sensitive to it, and the model produces significant energy savings because of it.</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt">And, it’s my understanding the R-value rating of the insulation is used despite that the rating is based on more or less zero air flow.</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt">So, I’m wondering if the models, seeing both zero-air-flow insulation and un-moderated leakage rates, ignore one or the other or somehow produce a modulated result that reflects reduced wall assembly R-value from air leakage through it.</span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt"> </span></p>
<p><span style="FONT-SIZE: 10pt">Paul Grahovac, LEED AP</span></p>
<p><span style="FONT-SIZE: 10pt">Product Manager </span></p>
<p><span style="FONT-SIZE: 10pt">R-GUARD Air & Water-Resistive Barrier </span></p>
<p><span style="FONT-SIZE: 10pt">PROSOCO, Inc.</span></p>
<p><span style="FONT-SIZE: 10pt">3741 Greenway Circle</span></p>
<p><span style="FONT-SIZE: 10pt">Lawrence, Kansas 66046</span></p>
<p><span style="FONT-SIZE: 10pt">(785) 830-7355</span></p>
<p><span style="FONT-SIZE: 10pt">(888) 376-3417 fax</span></p>
<p><span style="FONT-SIZE: 10pt"><a href="mailto:pgrahovac@prosoco.com" target="_blank">pgrahovac@prosoco.com</a></span></p>
<p><span style="FONT-SIZE: 10pt">web site <a href="http://www.prosoco.com/" target="_blank">http://www.prosoco.com/</a></span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: black; FONT-SIZE: 10pt"> </span></p></div></div><br>_______________________________________________<br>Bldg-sim mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a><br>
To unsubscribe from this mailing list send a blank message to <a href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a><br><br></blockquote></div><br>