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<DIV><SPAN class=911453114-03122003><FONT face=Arial color=#0000ff
size=2>Hello:</FONT></SPAN></DIV>
<DIV><SPAN class=911453114-03122003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=911453114-03122003><FONT face=Arial color=#0000ff size=2>We are
currently completing a report for the Texas Legislature where we have attempted
to simulate the effects of thermal mass on a "standard" building as defined by
the 2000 IECC. So far, we've spent most of our time trying to define how to
simulate the building, since the 2000 IECC is flawed in that it requires 13.5
lb/ft2 of floor space, which makes the simulation of thermal mass impossible
with DOE-2. (i.e., it forces the use of floor-weight values, which then use
pre-calculated ASHRAE weighting factors, which are not as accurate as custom
weighting factors). </FONT></SPAN></DIV>
<DIV><SPAN class=911453114-03122003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=911453114-03122003><FONT face=Arial color=#0000ff size=2>There
are multiple issues with accomplishing this with DOE-2, which our report points
out in some detail. In general the report shows mixed results, with the largest
variation coming from peak value predictions, which is important for Texas and
the Ozone reduction during summertime (i.e.,reduce peak cooling loads). We also
found the following items affect the results: SC vs Window 5 simulation of
windows, Effective-U value and fictitious ground heat transfer
(i.e., Winklemann's memo), placement of the mass has an impact as well
(inside or outside of thermal mass). Finally, the ground temperatures that DOE-2
uses when using a TMY2 tape for a city are suspect (i.e., too cold for Texas in
the summer and winter, average o.k.). I'm hoping to have a synopsis of the
report to pass around at the next 90.1 Envelop meeting and/or TC 4.7 in Kansas
City.</FONT></SPAN></DIV>
<DIV><SPAN class=911453114-03122003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=911453114-03122003><FONT face=Arial color=#0000ff
size=2>Jeff</FONT></SPAN></DIV>
<DIV><SPAN class=911453114-03122003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><FONT face=Tahoma size=2>8=! 8=) :=)
8=) ;=) 8=) 8=( 8=)
8=() 8=) 8=| 8=)
:=') 8=) 8=) 8=?</FONT> </DIV>
<P><I><FONT face=Tahoma size=2>Jeff S. Haberl, Ph.D.,
P.E.............................jhaberl@esl.tamu.edu</FONT></I> <BR><I><FONT
face=Tahoma
size=2>Professor...............................................Office Ph:
979-845-6507</FONT></I> <BR><I><FONT face=Tahoma size=2>Department of
Architecture...........................Lab Ph: 979-845-6065</FONT></I>
<BR><I><FONT face=Tahoma size=2>Energy Systems
Laboratory...........................FAX: 979-862-2457</FONT></I> <BR><I><FONT
face=Tahoma size=2>Texas A&M
University..................................77843-3581</FONT></I> <BR><I><FONT
face=Tahoma size=2>College Station, Texas, USA...........................URL:
www-esl.tamu.edu</FONT></I> </P>
<P><FONT face=Tahoma size=2>8=/ 8=) :=) 8=)
;=) 8=) 8=() 8=) :=)
8=) 8=! 8=) 8=? 8=)
8=) 8=0 </FONT></P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> postman@gard.com
[mailto:postman@gard.com]<B>On Behalf Of </B>David Stewart<BR><B>Sent:</B>
Tuesday, December 02, 2003 11:27 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] Increased R value Credit for
Concrete and Themal Massing<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Dear Folks</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Has anyone explored the increased R value credits
for thermal massing for example Dow T-Mass etc. and can one simply increase
the R value to the 'effective R value while changing the mass in DOE. I
would like some more background on this credit with 3rd party
validation</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Dave Stewart</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>David C. Stewart & Associates Inc.<BR>16
Shawinigan Road<BR>Dartmouth, NS B2W 3A3</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Website: <A
href="http://dcsa.ca">http://dcsa.ca</A></FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Tel: 902 462 8111<BR>Fax 902 435
6646</FONT></DIV></BLOCKQUOTE><PRE>
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