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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi Ryan,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">For most climate zones, your baseline will be a steel-framed wall with R13 cavity insulation. The extra info you’re looking for is available in Appendix A of ASHRAE 90.1, which describes the assumptions used to come up with the U-factors in section 5. From outside to inside you have stucco, 5/8” gypsum, framing/insulation layer, 5/8” gypsum (per pg 80 of 90.1 2007).</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">My modeling process is as follows:</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoListParagraph" style><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>1)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Create a construction in eQUEST with the layers listed above, using library components.</span></p>
<p class="MsoListParagraph" style><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>2)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">For the cavity insulation/framing layer, use a DOE-2 library batt insulation and set the thickness of the insulation layer so that the R-value of the layer equals the effective R-value of the R13 insulation between steel studs (R6, per table A9.2B on page 101 of ASHRAE 90.1). (R = thickness/conductivity)</span></p>
<p class="MsoListParagraph" style><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>3)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">You can stop here. The U-factor that you see in various places in eQUEST will differ slightly versus what’s shown in Section 5 of 90.1 (the difference should be several thousandths... if it’s more than a hundredth you’ve probably made a mistake). This is due to treatment of air films. Also, eQUEST stucco is R0.2 while ASHRAE stucco is R0.08. In any case, reviewers should not complain.</span></p>
<p class="MsoListParagraph" style><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>4)<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">If you are afraid of excessively nitpicky reviewers (which I believe is a mistake on their part), you can calibrate whatever output report you’re giving them (such as the LV-D report) to match ASHRAE exactly. Just adjust the thickness of the insulation layer by the tiny bit necessary to get the U-values to match. But don’t look at the U-value reported by the eQUEST interface when you do this, since it doesn’t match the LV-D report (per notes below).</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Note:</span></p>
<p class="MsoListParagraph" style="margin-left:20.25pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>-<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The U-factors listed in 90.1 include both air-films (per the definitions section of 90.1 as well as Appendix A) </span></p>
<p class="MsoListParagraph" style="margin-left:20.25pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>-<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The U-factor shown in the eQUEST interface includes the interior but not the exterior air-film.</span></p>
<p class="MsoListParagraph" style="margin-left:20.25pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span style>-<span style="font:7.0pt "Times New Roman""> </span></span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">The U-factor shown in the eQUEST LV-D report (the summary at the bottom of this report is a nice place to check when QCing models) includes both the interior and exterior air-film, assuming 7.5 mph wind</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Regards,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Mike Karpman</span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#006600">Karpman Consulting</span></b></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(860) 430-9110</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">41C New London Turnpike</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Glastonbury, CT 06033</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";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;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Ryan Black<br>
<b>Sent:</b> Thursday, September 19, 2013 5:20 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Semiheated envelope constructions</span></p>
</div><p class="MsoNormal"> </p><div><p class="MsoNormal">I just noticed I left out key information. The tables and categories I referenced are for ASHRAE 90.1 2007 Appendix G baseline building...</p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt">
</p><div><p class="MsoNormal">On Thu, Sep 19, 2013 at 1:30 PM, Ryan Black <<a href="mailto:ryanblack17@gmail.com" target="_blank">ryanblack17@gmail.com</a>> wrote:</p><div><p class="MsoNormal">I am working on building my first model in eQuest. I have a warehouse that falls into the semiheated category and I'm wondering how to build the layers up to reach the given construction U-value. I know that you can simply hard enter that value, but I've been told it is better to build the layers. Is this true? And if so, any pointers on how to get the layer assembly value reasonably close to the table U-values would be greatly appreciated!</p>
<div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Thanks,</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Ryan</p></div></div></div><p class="MsoNormal"> </p></div></div></body></html>