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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Also if, you have conditioned spaces in an unconditioned parking garage (elevator lobbies, heated storage, mech/elec spaces, back of house space, etc), the walls
that separate the conditioned space from unconditioned count in your wall areas, and typically don’t have much glazing, and help bring your proposed glazing % down.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><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"> Nicholas.Caton@schneider-electric.com [mailto:Nicholas.Caton@schneider-electric.com]
<br>
<b>Sent:</b> Thursday, July 28, 2016 1:12 PM<br>
<b>To:</b> mcamp1206@gmail.com; Nathan Miller <nathanm@rushingco.com><br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] Curtain wall system - how to model baseline?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Spandrel (opaque) sections of curtainwall are “walls” in both proposed and baseline cases as far as 90.1 terminology is concerned. Consider them as such for
determining both Proposed and Baseline case WWR’s.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">In my past year of experience, similar to Nathan, I’ve dealt with many “fishbowl” buildings which appear all (or mostly) glass from the outside but typically
have at least few feet of insulated envelope on the interior perimeter, so in that case it’s literally a wall construction with the outermost layer being glazing (or airspace then glass).
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Be sure to dig up any relevant envelope sections/details to carefully draw the line between “opaque” and “not opaque.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">~Nick<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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46"><img border="0" width="722" height="9" style="width:7.5208in;height:.0937in" id="Picture_x0020_1" src="cid:image001.png@01D1E8D2.8823F890"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E.</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#3A7A46"><o:p></o:p></span></p>
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Suite 204<br>
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United States</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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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"> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Michael Campbell via Equest-users<br>
<b>Sent:</b> Thursday, July 28, 2016 11:12 AM<br>
<b>To:</b> Nathan Miller<br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Curtain wall system - how to model baseline?<o:p></o:p></span></p>
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<p class="MsoNormal">Thanks for the response Nathan.<o:p></o:p></p>
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<p class="MsoNormal">There will be some spandrel glass, but I'm not sure how much.<o:p></o:p></p>
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<p class="MsoNormal">But basically the spandrel portion would be considered a wall in the baseline.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Only the transparent window assemblies would be considered in the WWR. Is that correct?<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 <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Jul 28, 2016 at 11:53 AM, Nathan Miller <<a href="mailto:nathanm@rushingco.com" target="_blank">nathanm@rushingco.com</a>> wrote:<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: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. </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><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.
</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-top:1.0pt;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#632423"> </span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:4.0pt"><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><o:p></o:p></p>
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<b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200">RUSHING</span></b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
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</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black"><a href="tel:206-788-4577" target="_blank">206-788-4577</a> |</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
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</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black"><a href="tel:206-285-7100" target="_blank">206-285-7100</a></span><o:p></o:p></p>
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<b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200"><a href="http://www.rushingco.com/" target="_blank"><span style="color:#6F1200">www.rushingco.com</span></a></span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri",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:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>]
<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> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Curtain wall system - how to model baseline?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt">Hello,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The model will be based on ASHRAE 90.1-2013 Appendix G.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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="mso-margin-top-alt:auto;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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thank you,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Mike Campbell<o:p></o:p></p>
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