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<title>Simple question...hopefully</title>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0000B4'>There was a paper written by Victor Olgyay & Myself
(published at the ASES 2006 conference in Denver I think) where we looked at
optimizing glazing with two case studies in different climatic conditions –
Atlanta & Hawaii. We separated out the three properties – U-Value,
SHGC & Tviz. The Hawaii building actually performed better with the single
glazed units, whereas Atlanta with a significant winter season was more
intuitive – performing better with the lower U-Values. The other factor
is balance point temperature – if you have a really high internal heat
load, sometimes the higher U-Value might be beneficial even in cooler climates.
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0000B4'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0000B4'>SHGC & T-Viz need to be examined in concert with each other.
There are high performance systems that get you the best of both worlds –
Solarban 70 on Starphire glass is one of them. <o:p></o:p></span></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto'><b><span style='font-family:
"Garamond","serif";color:black'>Vikram Sami,</span></b><span style='color:#0000B4'>
</span><span style='font-family:"Garamond","serif";color:black'>LEED AP</span><span
style='color:#0000B4'> <br>
</span><span style='font-family:"Garamond","serif";color:black'>Direct Phone
404-253-1466 | Direct Fax 404-253-1366</span><span style='color:#0000B4'> <o:p></o:p></span></p>
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style='font-size:10.0pt;font-family:"Garamond","serif";color:maroon'>ORD</span></b><b><span
style='font-family:"Garamond","serif";color:maroon'>, A</span></b><b><span
style='font-size:10.0pt;font-family:"Garamond","serif";color:maroon'>ECK</span></b><b><span
style='font-family:"Garamond","serif";color:maroon'> & S</span></b><b><span
style='font-size:10.0pt;font-family:"Garamond","serif";color:maroon'>ARGENT</span></b><b><span
style='font-family:"Garamond","serif";color:maroon'> A</span></b><b><span
style='font-size:10.0pt;font-family:"Garamond","serif";color:maroon'>RCHITECTURE</span></b><b><span
style='color:#0000B4'><br>
<br>
</span></b><span style='color:#0000B4'><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:#0000B4'><o:p> </o:p></span></p>
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<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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Kevin
Kyte<br>
<b>Sent:</b> Monday, November 16, 2009 3:46 PM<br>
<b>To:</b> Nick Caton; David Delasantos; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Simple question...hopefully<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Increased glazing performance may result in less thermal transfer
through the envelope. This may result in increased or deceased energy
savings. Depending on climate, varying heat transfer through fenestration
may result in more energy use in the winter and less in the summer or vice
versa. There is usually a happen middle point which will give the best
returns. The same applies to increasing and decreasing insulation.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
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<hr size=2 width="100%" align=center>
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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"'> Nick Caton
[mailto:ncaton@smithboucher.com] <br>
<b>Sent:</b> Monday, November 16, 2009 12:21 PM<br>
<b>To:</b> David Delasantos; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Simple question...hopefully</span><o:p></o:p></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In a recent project, our architect decided to
“upgrade” to nicer (more expensive) glass. These
fenestrations had marginally better thermal properties, so I had the same
surprise to find the annual energy figures going 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'>After some investigation, it turned into an important design
lesson which may or may not apply to your case: This project had a
significant amount of daylighting, and the “improved” glass had a significantly
lower Tvis figure. Less light in means more energy spent on the lighting
system!<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 the role of lighting system designer, I used to ignore things
like glass transmissivity, as I was taught to design around the worst case
(i.e. nighttime where window contributions have little/no effect)… now I
pay very close attention when daylight harvesting is a part of the project!<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'>Hope this helps either your current situation, or otherwise in
the future!<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>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=119 height=37 id="Picture_x005f_x0020_1"
src="cid:image001.jpg@01CA66E4.BB3A3090" alt="cid:489575314@22072009-0ABB"></span><b><span
style='font-size:11.0pt;font-family:"Stylus BT";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Stylus BT";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-family:"Stylus BT";
color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900'>PROJECT ENGINEER</span><span style='font-size:7.5pt;color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>25501 west valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E'>Check out our new web-site @ </span></i><span style='font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue'> </span></u><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<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"'>
equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>David Delasantos<br>
<b>Sent:</b> Monday, November 16, 2009 11:02 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Simple question...hopefully<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I ran a very
quick and dirty EEM to compare the effects of using a different glass type when
compared to the baseline model, which was created in the SD Wizard.
Contrary to my expectations, the higher performance glass resulted in<i> higher</i>
annual energy usage! The glazing is the only component I changed in the
model. If anyone can speak to this result, I would appreciate it.</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thank
you…DD</span> <o:p></o:p></p>
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