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<p class=MsoNormal><span style='color:#1F497D'>Hi Namrata,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>As I see it, there are 2 ways
that glass affects energy: solar gains coming in (which is tied to the SHGC) and
heat transfer through the unit (tied to the U-factor). If you substantially
reduce the SHGC going from double to triple pane, then you may be losing some
passive heating, thus increasing your boiler sizing (although I would expect it
would have to be a substantial change in SHGC to outweigh the benefits of
improved U-factor). As for U-factor: in a building with high-internal loads you
may benefit in summer from excess heat being released through the glazing (as
Vikram pointed out) – so this would increase your peak chiller capacity.
That would not entirely surprise me, but I think an increase in boiler size is
less typical.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>My 2¢.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Alex Krickx<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;color:#262F13'>Alex Krickx<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:gray'>Building Energy
Specialist<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:8.0pt;color:#1F497D'><img width=121
height=42 id="_x0000_i1026" src="cid:image002.jpg@01CB4377.618BEB40"
alt="email_sig"></span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:#1F497D'>1250 Elko Dr,
Sunnyvale, CA 94089<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:#1F497D'>(t) 408.541.8124<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:9.0pt;color:gray'><o:p> </o:p></span></p>
<p class=MsoNormal><b><i><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#1F497D'>Warning:</span></i></b><i><span style='font-size:7.5pt;
font-family:"Arial","sans-serif";color:#1F497D'> The information contained
in this e-mail may be privileged attorney-client communications or attorney
work product and/or proprietary and confidential. If the reader of this
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to notify us immediately by reply e-mail and delete the original message
immediately.</span></i><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='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-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Namrata
Vora<br>
<b>Sent:</b> Monday, August 23, 2010 6:12 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] HVAC sizing - triple vs. dual<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>eQuest is showing for identical bldgs HVAC sizing for triple
pane to be more than that for dual pane for cold climates like Edmonton. Is
that normal?<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Namrata <o:p></o:p></p>
<p class=MsoNormal>Work: 408-263-9225<o:p></o:p></p>
<p class=MsoNormal>Cell: 408-893-3729<o:p></o:p></p>
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