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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D">Jeff,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D">Keep in mind, ASHRAE 90.1 baseline roof reflectance value is 30%. If the project design calls for a highly reflective roof (i.e. reflectance, emittance, and SRI)
then a 45% reflectance is modeled in eQUEST rather than the specified reflectance per the design documents.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:4.5pt"><b><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D">David W. Griffin II<o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left:4.5pt"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D">Energy Analyst<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:4.5pt"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D">ETC Group, LLC<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:4.5pt"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D">801-278-1927 x 128<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:4.5pt"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:#17365D">dgriffin@etcgrp.com<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:4.5pt"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#17365D">Energy Engineering for a Sustainable Future</span></b><span style="font-size:6.0pt;font-family:"Arial","sans-serif";color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:4.5pt"><span style="font-size:6.0pt;font-family:"Arial","sans-serif";color:black">1997 South 1100 East, Salt Lake City, UT 84106-4471
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<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""> Aaron Powers [mailto:caaronpowers@gmail.com]
<br>
<b>Sent:</b> Friday, November 08, 2013 7:11 PM<br>
<b>To:</b> jeff@rbgb.com; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Roof reflectivity, emissivity and absorptance in equest<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Jeff,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">For an opaque surface, you can just convert reflectance to absorptance by: absorptance = 1 - reflectance. This is the absorptance in the solar spectrum. The emittance (in IR spectrum) is a little more hidden. In detailed mode, if you
select an exterior roof and look under the "Daylighting - Shading - Other" you'll see the Outside Emissivity input. It sounds like you know where to input the absorptance, but just in case, it is under the roof construction in detailed mode. SRI is a calculated
value used to compare roof materials and so is not useful for energy modeling software.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Aaron<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Hi All,</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">ASHRAE refers to roof properties in terms of reflectance, emittance, and SRI (Appendix G Table G3.1
5c). However, eQuest uses absorptance. I am unable to find in the eQuest input areas (wizard and detailed) where there is a means to input values other than absorptance. Is there a conversion factor, or a place to input reflectance, and emittance or SRI that
I am unable to find?</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Many thanks for your comments.</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"> </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">Best regards -</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#006E78">Jeff Ross-Bain, PE, </span></b><span style="font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#006E78">LEED
AP BD+C, BEMP</span><span style="font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#535053"><br>
Principal</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#535053"><a href="tel:404-220-8940" target="_blank">404-220-8940</a> Office</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt"><b><span style="font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#006E78"><a href="http://www.rbgb.com/" target="_blank">www.rbgb.com</a></span></b><span style="font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#535053"><br>
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</span><span style="font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#006E78">Build Green. Save Time</span><o:p></o:p></p>
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