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<title>Simple question...hopefully</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;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></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Nick Caton
[mailto:ncaton@smithboucher.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, November 16, 2009
12:21 PM<br>
<b><span style='font-weight:bold'>To:</span></b> David Delasantos; <st1:PersonName
w:st="on">equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] Simple
question...hopefully</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Hope this helps
either your current situation, or otherwise in the future!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>~Nick<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><img width=119
height=37 id="Picture_x005f_x0020_1" src="cid:image001.jpg@01CA66D3.D0723A40"
alt="cid:489575314@22072009-0ABB"></span></font><b><font size=2 color="#2d4d5e"
face="Stylus BT"><span style='font-size:11.0pt;font-family:"Stylus BT";
color:#2D4D5E;font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#2d4d5e" face="Stylus BT"><span
style='font-size:11.0pt;font-family:"Stylus BT";color:#2D4D5E;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color="#2d4d5e" face="Stylus BT"><span
style='font-size:11.0pt;font-family:"Stylus BT";color:#2D4D5E;font-weight:bold'>NICK
CATON, E.I.T.</span></font></b><b><font color="#2d4d5e" face="Stylus BT"><span
style='font-family:"Stylus BT";color:#2D4D5E;font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=1 color="#cc9900" face=Calibri><span
style='font-size:7.5pt;font-family:Calibri;color:#CC9900'>PROJECT ENGINEER</span></font><font
size=1 color="#cc9900"><span style='font-size:7.5pt;color:#CC9900'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#2d4d5e" face=Calibri><span
style='font-size:10.0pt;font-family:Calibri;color:#2D4D5E'>25501 west valley
parkway<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:City w:st="on"><st1:place w:st="on"><font size=2
color="#2d4d5e" face=Calibri><span style='font-size:10.0pt;font-family:Calibri;
color:#2D4D5E'>olathe</span></font></st1:place></st1:City><font size=2
color="#2d4d5e" face=Calibri><span style='font-size:10.0pt;font-family:Calibri;
color:#2D4D5E'> ks 66061<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#2d4d5e" face=Calibri><span
style='font-size:10.0pt;font-family:Calibri;color:#2D4D5E'>direct 913 344.0036<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#2d4d5e" face=Calibri><span
style='font-size:10.0pt;font-family:Calibri;color:#2D4D5E'>fax 913 345.0617<o:p></o:p></span></font></p>
<p class=MsoNormal><i><font size=2 color="#2d4d5e" face=Calibri><span
style='font-size:10.0pt;font-family:Calibri;color:#2D4D5E;font-style:italic'>Check
out our new web-site @ </span></font></i><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><font size=2><span
style='font-size:10.0pt'>www.smithboucher.com</span></font></a></span></font><u><font
size=2 color=blue face=Calibri><span style='font-size:10.0pt;font-family:Calibri;
color:blue'> </span></font></u><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>David Delasantos<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, November 16, 2009
11:02 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">equest-users@lists.onebuilding.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [Equest-users] Simple
question...hopefully<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>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><span style='font-style:italic'> higher</span></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></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thank
you…DD</span></font> <o:p></o:p></p>
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