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<DIV><SPAN class=837422022-24062003><FONT face=Arial color=#0000ff size=2>Couple
of questions:</FONT></SPAN></DIV>
<DIV><SPAN class=837422022-24062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=837422022-24062003><FONT face=Arial color=#0000ff size=2>1.
What is the freezer floor? Is it insulated? </FONT></SPAN></DIV>
<DIV><SPAN class=837422022-24062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=837422022-24062003><FONT face=Arial color=#0000ff size=2>2.
What are the exterior conditions? Is this freezer in an unconditioned
warehouse?</FONT></SPAN></DIV>
<DIV><SPAN class=837422022-24062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=837422022-24062003><FONT face=Arial color=#0000ff size=2>3. Are
you using custom weighting factors or pre-calculated weighting
factors?</FONT></SPAN></DIV>
<DIV><SPAN class=837422022-24062003><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=837422022-24062003><FONT face=Arial color=#0000ff
size=2>Jeff</FONT></SPAN><BR></DIV>
<P><FONT face=Tahoma size=2>8=! 8=) :=)
8=) ;=) 8=) 8=( 8=)
8=() 8=) 8=| 8=)
:=') 8=) 8=) 8=?</FONT> </P>
<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>Associate 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>Mark E. Case<BR><B>Sent:</B>
Tuesday, June 24, 2003 3:45 PM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] Thermal mass
walls<BR><BR></FONT></DIV><!-- Converted from text/rtf format -->
<P><FONT face=Arial size=2>Ok - here's a question, maybe stimulate a little
controversy but as many of you know - that's the way I like it.
</FONT><BR><FONT face=Arial size=2>-10 F freezer, 100,000+ square feet.
Reasonably steady product loading 24 hours a day (say 90 tons +/- 25 tons in a
given hour).</FONT></P>
<P><FONT face=Arial size=2>Two envelope systems: 5" metal skin panel with
expanded polyurethane vs. thermal mass panel of 8" HW concrete interior, 6"
extruded polystyrene, 2-1/2 HW concrete exterior.</FONT></P>
<P><FONT face=Arial size=2>Polyu conductivity .0142 btu/h-ft-F (LTTR basis).
Metal skin wall U without external skin resistance (DOE2) = ..033. Polystyrene
.0167, thermal mass wall U = .030. </FONT></P>
<P><FONT face=Arial size=2>Question - which one is better? That's a loaded
question but from a strictly thermal performance measure - kWh per year
to cool - is there more difference than the .030 vs. .033 U-value would
imply?.</FONT></P>
<P><FONT face=Arial size=2>We are using eQuest (Doe2.2) and it show the
thermal mass as `slightly' better. The manufacturer, based largely on
testimonial evidence, insists it is MUCH better. </FONT></P>
<P><FONT face=Arial size=2>One issue that they raise is infiltration through
the metal skin panels and the impact on in-situ R value. They site ORNL test
results that apparently show this but I've not seen them. I know ORNL did some
testing on apparent R of mass walls but it didn't seem conclusive to me that
it would apply in this situation.</FONT></P>
<P><FONT face=Arial size=2>Anyone out there that can cite well documented
research about the differences? Anyone have comments about DOE2's strengths
and weaknesses in capturing the effects of the large wall thermal
mass?</FONT></P><BR>
<P><FONT face=Arial size=2>Mark E. Case, President</FONT> <BR><FONT face=Arial
size=2>etc Group, Inc.</FONT> </P><PRE>
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