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<DIV dir=ltr align=left><SPAN class=759235717-24082010><FONT face=Arial
color=#0000ff size=2>During the summer peak wouldn't you expect the heat flow to
be into the spaces from the outside? You have been talking about
times when the outside temperature is below the space set points for the
free cooling effect.</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Alex
Krickx<BR><B>Sent:</B> Tuesday, August 24, 2010 1:31 PM<BR><B>To:</B> Namrata
Vora; equest-users@lists.onebuilding.org<BR><B>Subject:</B> Re: [Equest-users]
HVAC sizing - triple vs. dual<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=WordSection1>
<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: 12pt; COLOR: #262f13">Alex
Krickx<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 9pt; COLOR: gray">Building Energy
Specialist<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 8pt; COLOR: #1f497d"><IMG
id=_x0000_i1026 height=42 alt=email_sig src="cid:759235717@24082010-2B61"
width=121></SPAN><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 9pt; COLOR: #1f497d">1250 Elko Dr,
Sunnyvale, CA 94089<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 9pt; COLOR: #1f497d">(t)
408.541.8124<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 9pt; COLOR: gray"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><B><I><SPAN
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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: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; 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></DIV></DIV>
<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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src="cid:759235717@24082010-2B68" width=144><o:p></o:p></P>
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