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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Would there really be no opaque portions (aka spandrel) of the curtain wall? At the very least I’d expect you’d have about a 1’ high slab-edge-bypass opaque section.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Our curtainwall projects (resi and office) typically have 40-50% vision glazing, and the rest is opaque, and gets modeled as a wall with calculated U-factor depending
on the spandrel + inboard insulation configuration. <o:p></o:p></span></p>
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<b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#6F1200">Nathan Miller, PE, LEED AP BD+C</span></b><b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423"> –
</span></b><i><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:black">Mechanical Engineer/Senior Energy Analyst</span></i><b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Michael Campbell via Equest-users<br>
<b>Sent:</b> Thursday, July 28, 2016 11:51 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Curtain wall system - how to model baseline?<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hello,<o:p></o:p></p>
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<p class="MsoNormal">I have a potential project in which the client is proposing a curtain wall system.<o:p></o:p></p>
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<p class="MsoNormal">The model will be based on ASHRAE 90.1-2013 Appendix G.<o:p></o:p></p>
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<p class="MsoNormal">I believe the appropriate way to model this would be to have a WWR of 100% (or near 100%) in the proposed case. For the baseline case, the window area would have to be reduced to get the WWR down to 40%.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Is this the correct way or is there different guidance for modeling curtain wall systems?<o:p></o:p></p>
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<p class="MsoNormal">Thank you,<o:p></o:p></p>
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<p class="MsoNormal">Mike Campbell<o:p></o:p></p>
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