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<DIV dir=ltr align=left><SPAN class=454451515-29052009><FONT face=Arial
color=#0000ff size=2>I have come across that situation a couple
times. The conclusion I came to for replacing windows with a "better"
(lower) SHGC and "better" (higher) U-value, and still getting more
energy use, has to do with heat
balance. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=454451515-29052009><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=454451515-29052009><FONT face=Arial
color=#0000ff size=2>When a building is in a mild/cool climate, the outside
air temp causes room temperatuer to drop below setpoint (ie, 68F) during
unoccupied times. (Heat is lost through the envelope from a
higher temperature to lower temperature.) This can also happen if your building
schedule has long periods of unoccupied times between events like in a
conference center. In the morning, the the outside air temperature picks
up and solar radiation starts coming through the envelope. During these
times, the space wants to be brought up to an
occupied temperature (72F) from its unoccupied space temp (65F) and
would actually benefit from a less resistant envelope because a "poorer"
performing envelope allows faster heat gain in the space.
</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=454451515-29052009></SPAN><SPAN
class=454451515-29052009><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=454451515-29052009><FONT face=Arial
color=#0000ff size=2>I hope that kind of makes sense.</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV align=left><FONT face=Arial size=3><STRONG>Linda Lam, LEED</STRONG><FONT
face="Times New Roman">®</FONT><STRONG> AP</STRONG></FONT></DIV>
<DIV align=left><FONT face=Arial color=#808080 size=2><EM></EM></FONT></DIV>
<DIV align=left><STRONG><FONT face=Arial size=3>WSP
FLACK+KURTZ</FONT></STRONG></DIV>
<DIV align=left><FONT face=Arial size=2>405 Howard St. San Francisco CA
94105</FONT></DIV>
<DIV align=left><FONT face=Arial
size=2><STRONG>Direct</STRONG> 415.402.5813</FONT></DIV>
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<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>Matutinovic, Luka<BR><B>Sent:</B> Friday, May 29, 2009 7:29 AM<BR><B>To:</B>
jklikape@aol.com; equest-users@lists.onebuilding.org<BR><B>Subject:</B> Re:
[Equest-users] Modeling Window changes<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><SPAN class=210492414-29052009><FONT face=Univers color=#0000ff
size=2>John,</FONT></SPAN></DIV>
<DIV><SPAN class=210492414-29052009><FONT face=Univers color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=210492414-29052009><FONT face=Univers color=#0000ff size=2>It's
difficult to diagnose your issue without having the .inp and .pd2 files to
review. </FONT></SPAN></DIV>
<DIV><SPAN class=210492414-29052009><FONT face=Univers color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=210492414-29052009><FONT face=Univers color=#0000ff size=2>What
do you mean by "more energy efficient"? If you are referring to U-value,
the result does seem counter-intuitive (unless the negative result is actually a
reduction in energy shown as a "negative"). If however, you consider a
reduction in the SHGC to be more energy efficient, this may in fact lead to
increased energy use in heating dominated climates since less solar gain is
available in the winter. As I said, seeing the simulation would be
helpful.</FONT></SPAN></DIV>
<DIV><SPAN class=210492414-29052009><FONT face=Univers color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=210492414-29052009><FONT face=Univers color=#0000ff
size=2>Cheers,</FONT></SPAN></DIV>
<DIV><SPAN class=210492414-29052009>
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<P class=MsoNormal dir=ltr align=left><FONT color=#0000ff><B><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial">Luka Matutinovic, </SPAN></B><SPAN
class=SpellE><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial">B.A.Sc</SPAN></SPAN><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial">., LEED<SUP>®</SUP>
AP</SPAN></FONT></P>
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color=#0000ff>Green Building Consultant</FONT></SPAN></EM><I><SPAN
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416.487.9766 <BR>Toll Free 1.888.425.7255<BR>www.halsall.com
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<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>jklikape@aol.com<BR><B>Sent:</B> Friday, May 29, 2009 10:23 AM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] Modeling
Window changes<BR></FONT><BR></DIV>
<DIV></DIV><FONT face="Arial, Helvetica, sans-serif"><FONT
face="Arial, Helvetica, sans-serif">Good Morning,<BR></FONT>My associate and I
are beginners on the E-Quest program and are feeling our way around the
program. Among many other questions that we may have we are in a quandry
as to why, when we use a more energy efficient window in the EEM
module, the results show a negative effect in our simulation. Is
there some basic fundimental we,re missing here?</FONT> <BR><BR>John
Klika<BR>KGZ Consulting Engineers, Ltd.<BR>Joliet, Illinois <BR>815-714-2818
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