Hi Nikola,<div><br></div><div>In order to meet LEED EAp2 Minimum Energy Performance, the project must comply with all mandatory provisions of ASHRAE 90.1-2007. Section 5.4.2 Fenestration and Doors requires that fenestration performanc be determined per section 5.8.2. Section 5.8.2.5 Solar Heat Gain Coefficient requires that the SHGC for the overall fenestration area (including framing) be determined in accordance with NFRC 200. </div>
<div><br></div><div>If you read the exceptions, what you have done previously (use COG SHGC) is an acceptable method per 5.8.2.5 exception b. The method described in your quote below is not acceptable unless you are provided with an NFRC simulation or certified product number showing that the SHGC is 0.25 when framing is accounted for per NFRC 200.</div>
<div><br></div><div><p class="MsoNormal" style="margin-top:1.0pt"><a name="_MailAutoSig"><b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";mso-fareast-font-family:
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color:#1F497D;mso-no-proof:yes"></span></span></p></div><div><br><div class="gmail_quote">On Tue, Jul 12, 2011 at 1:06 PM, Nikola Kravik <span dir="ltr"><<a href="mailto:nkravik@mazzetti.com">nkravik@mazzetti.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Can the statement on the SHGC reduction below (0.29 down to 0.25) be true if you have a lot of framing? <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">I’ve always increased the U value to adjust for the frame effect, but never decreased the SHGC~ 13%; I’ve actually left it same as the COG SHGC, now I’m asked to plug this 0.25 instead of 0.29;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> Can anyone share thoughts if this will fly with LEED v3 since I believe that a 4’x6’ window can’t be slightly lower on SHGC but not 13%?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt">…….that <span style="background:silver"><a href="http://www.viracon.com/downloads/resources/BDESSustainableFlyer.pdf" target="_blank"><span style="color:windowtext">the glazing selected (VNE1-63) has the highest light-to-solar-gain ratio of any one available</span></a>.</span> The SHGC at center-of-glass is 0.29, and scaled to account for framing the unit SHGC is 0.25—exactly the ASHRAE reference value for our climate zone 2A….</span>referring to ASH 90.1-2007;<span style="font-size:10.0pt"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">I appreciate your feedback.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p><p class="MsoNormal">
<span style="font-size:11.0pt;color:#1F497D">Cheers,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">n<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><u></u> <u></u></span></p></div></div><br>_______________________________________________<br>
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