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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I also calculated a frame SHGC of 0.57 (the formula is an
area-weighting formula) and was surprised by that number (seems high).<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'>The formula also assumes 86% of the opening is glass and 14% of the
opening is frame. This certainly will vary. From a calculator I have, this
would line up with a Kawneer 1600 curtainwall system using 3’x3.5’ pieces of
glass. I would think, you’d be more likely to see 3’x5’ or 4’x6’ which have 88%
glass and 91% glass areas, respectively.<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'>Using that formula, if you have a COG SHGC of 0.7, your assembly
SHGC will go down. If you have a COG SHGC of 0.2, it will go up. <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'><o:p> </o:p></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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Cheney<br>
<b>Sent:</b> Friday, September 17, 2010 9:11 AM<br>
<b>To:</b> D. Charlie Curcija<br>
<b>Cc:</b> Jon Matthews; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Assembly SHGC<o:p></o:p></span></p>
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<p class=MsoNormal>When you use WINDOW to calculate total window SHGC, you will
find the SHGC will be reduced compared as the glaze one. It looks reasonable to
me since the impact of window frame has been considered. From this point
of view, the equation is not always correct. <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='margin-bottom:12.0pt'>Cheney <o:p></o:p></p>
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<p class=MsoNormal>On Fri, Sep 17, 2010 at 9:03 AM, D. Charlie Curcija <<a
href="mailto:curcija@designbuildersoftware.com">curcija@designbuildersoftware.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;color:#1F497D'>From this formula, it can be concluded
that SHGC of frame is assumed to be 0.57, which is high. Very high.
However, the formula may be provided for default (punitive) value if it does
not have NFRC rating. This is to encourage people to get accurate NFRC
values.</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;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;color:#1F497D'>Charlie</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;color:#1F497D'> </span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a
href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Jon Matthews<br>
<b>Sent:</b> Friday, September 17, 2010 11:36 AM<br>
<b>To:</b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> [Bldg-sim] Assembly SHGC</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;mso-margin-bottom-alt:auto'>Hello
All! I am confused to the formula that I found recently in the forum on
Assembly SHGC. I think its SHGCassembly = 0.08 + (0.86)(SHGCglass) (cant find
it now in the forum but I think it is something like this) which gives
me a higher assembly SHGC of glass. Is this correct? I thought that assembly
SHGC will be smaller than the SHGC of glass.<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;mso-margin-bottom-alt:auto'>Thanks
again to all!!<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;mso-margin-bottom-alt:auto'>Jon<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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