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<DIV dir=ltr align=left><SPAN class=881365513-30072007><FONT face=Arial
color=#0000ff size=2>Just a theory, but do you have the daylighting option
turned on? If so - the visible transmittance (I am assuming Glass 2 is darker)
will make a difference. It will increase your lighting load, and in turn your
cooling load. </FONT></SPAN></DIV>
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<P><B><FONT face=Garamond color=#000000>Vikram Sami,</FONT></B> <FONT
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<P><B><FONT face=Garamond color=#008000>Please don't print this email unless you
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<BR><I><FONT face=Garamond color=#008000>In the United States, we use enough
office paper each year to build a 10-foot high wall that’s 6,815 miles long or
two and a half times the distance from New York to Los Angeles. </FONT></I></P>
<P><I><FONT face=Garamond color=#008000>~ Wisconsin Department of Natural
Resources, “Recycling Facts and Figures,” PUBL CE-163, 2002.</FONT></I> </P>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
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<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>nicole chen<BR><B>Sent:</B>
Monday, July 30, 2007 4:03 AM<BR><B>To:</B> BLDG-SIM@gard.com<BR><B>Cc:</B>
bldg-sim@gard.com<BR><B>Subject:</B> [BLDG-SIM] energy consumption of low-E
glazing , why the cooling energy increases<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>What I did is define a new glass type with simplied method in detailed
model. Then replace the old glass with the new defined one. Can this do? How to
avoid the defauls percolate through the program? I check again and find that
there was no wrong with the conduction heat and solar radiation through window
.But the load due to occupancy /lighting/euqipment of Glass Type II
is higher than Glass Type I . And the cooling energy of Glass type II is a
little highter. It make me confused. Why the load due
to due to occupancy /lighting/euqipment was different when
Glass type changed. </DIV>
<DIV> </DIV>
<DIV>And I doubt if the problem has something to do with OA load
.<BR><BR> </DIV>
<DIV><SPAN class=gmail_quote>On 7/29/07, <B class=gmail_sendername>Karen
Walkerman</B> <<A
href="mailto:kwalkerman@gmail.com">kwalkerman@gmail.com</A>> wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hi
nicole,<BR><BR>I can't tell you why the heating energy of glass type II may be
lower<BR>because of the better U-value. With Shading Coefficients
almost the <BR>same, there should be little change in heat gain from solar
radiation<BR>between the two types.<BR><BR>What method did you use to enter
your data? You should be careful of<BR>defaults that can percolate
through the program. For example, the <BR>window frame U-value may
not be consistent, or the glass spacer-type<BR>may be
different.<BR><BR>Another good place to look for some feedback is the building
and space<BR>peak loads summary. Here, the solar gain (heat energy
gained through <BR>radiation) and simple conditioning (energy transfered
through the<BR>glass-same as walls), are broken out. The heating
design case will<BR>not take solar radiation into account.<BR><BR>Hope this
helps.<BR><BR>~karen~ <BR><BR>On 7/29/07, nicole chen <<A
href="mailto:cloris.chen@gmail.com">cloris.chen@gmail.com</A>>
wrote:<BR>> Dear all<BR>><BR>> I have tried to compare the energy
consumption between two different glass<BR>> types and got a curious
result. The parameters of these two glasses are<BR>> listed
below:<BR>><BR>> 1) Coated U=2.5 SC=0.45<BR>> 2) low-e
U=1.76 SC=0.44<BR>><BR>> I thought the energy consumption of Glass Type
II would be lower than that <BR>> of Glass Type I . But the result is the
cooling energy of Glass Type II is<BR>> higher than that of
Glass Type I , and the heating energy lower than that<BR>> of Glass Type
I.<BR>><BR>> I have no idea of this. And I checked LS-F/ SS-D / BEPS and
found some <BR>> points listed below<BR>><BR>> 1) in LS-F annual
sensible cooling load of Glass Type II is lower than that<BR>>
of Glass Type I , latent cooling load of Glass Type II is higher. The
total<BR>> annual cooling load of Glass Type II is a little higher
<BR>><BR>> 2) in SS-D monthly cooling energy of Glass Type II
is higher<BR>><BR>> 3) dencity and schedule of occupancy
/lighting /euqipment are the same in<BR>> the two models , but cooling load
and heating load due to these indoor <BR>> factors are different ,
why?<BR>><BR>> 4) monthly schedule of occupancy /lighting
/euqipment is all the same<BR>> during the year, but cooling
load and heating load due to these indoor<BR>> factors are different every
month, why? <BR>><BR>><BR>><BR>> --<BR>>
Yours<BR>> Nicole Chen<BR><BR><BR>--<BR>Karen
Walkerman<BR>Second Law Consulting<BR>802-238-0980<BR><A
href="mailto:kwalkerman@gmail.com">kwalkerman@gmail.com</A><BR></BLOCKQUOTE></DIV><BR><BR
clear=all><BR>-- <BR>Yours<BR>Nicole Chen <PRE>
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