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<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=180520422-07102002>I know
a researcher at LBNL that has done a significant amount of work on cool roofs. I
have taken the liberty to forward the previous emails to him to see if he can
provide any enlightenment. There are numerous papers in the peer reviewed
literature that you may want to look at. </SPAN></FONT></DIV>
<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>Tom Anderson<BR><B>Sent:</B>
Monday, October 07, 2002 2:32 PM<BR><B>To:</B>
BLDG-SIM@GARD.COM<BR><B>Subject:</B> [BLDG-SIM] "Cool
Roofing"<BR><BR></FONT></DIV>Oh Contrair.
<P> I ran load calcs for a 100,000 square foot single story big box store
in the Burlington, VT area last year to determine what if any benefits would
result from changing the flat membrane roof color from dark to light.
Occupancy was typical urban sprawl well-known national retailers.
<P>Peak air conditioning roof heat gain was reduced by 50%.
<P>Roof was insulated to about R-22, plenum return, packaged DX
rooftops. Ran the numbers using Carrier HAP. Annual AC energy
savings came in at about 3%. Software did show a *slight* heating season
penalty, but that was because the software did not account for the usual snow
cover on a Vermont roof in winter. There was a worthwhile installed tonnage
reduction also. <BR>
<DL>
<DD><FONT size=-1>Thomas E. Anderson</FONT>
<DD><FONT size=-1>President</FONT>
<DD><FONT size=-1>Cx Associates, Ltd.</FONT>
<DD><FONT size=-1>Building Commissioning Specialists</FONT>
<DD><I><FONT size=-1><A
href="http://www.cx-assoc.com">http://www.cx-assoc.com</A></FONT></I>
<DD><I><FONT size=-1>933 Road 101</FONT></I>
<DD><I><FONT size=-1>Jeffersonville, Vermont 05464 USA</FONT></I>
<DD><I><FONT size=-1>hvac@cx-assoc.com</FONT></I>
<DD><I><FONT size=-1>Tel: 802-644-5616 Fax: 802-644-6797</FONT></I>
</DD></DL>Marcus Sheffer wrote:
<BLOCKQUOTE TYPE="CITE"> Whenever we have modeled this in the Northeast
we also have seen negligible savings using PowerDOE and others.
<P>We have come to the conclusion that the savings depend upon the amount of
roof insulation and type of building. If we enter minimal insulation
the effect of a white roof is larger especially in a cooling dominated
building, high internal loads, etc.
<P>If you are installing even moderate amounts of insulation (R15 or more)
then the effect of a white roof in the Northeast is virtually nil for most
any building type.
<P>Now when it comes to the urban heat island effect it can have a
tremendously positive impact . . . but that is another issue. <BR>
<P>At 01:55 PM 10/07/2002 -0400, you wrote:
<BLOCKQUOTE class=cite cite="" type="cite"><FONT face=arial><FONT
size=-1>Has anyone had any success modeling cool roofing options (i.e.
reflective or light colored surfaces) in PowerDOE? So far, I have
seen negligible results from the adjustment of roof construction
absorptance values (emissivity is also known to play a role, but there is
no input for this in PowerDOE). I have seen data showing cooling
energy savings from 0.06 to 0.54 kWh/sqft/yr, depending on building
type. I am getting only a very small fraction of this. Data
collected in the study was from facilities in the southern and western US,
and I work primarily on buildings in the Northeast.</FONT></FONT>
<P><FONT face=arial><FONT size=-1>My questions:</FONT></FONT> <BR><FONT
face=arial><FONT size=-1>How well can I expect PowerDOE to simulate
this? Is there a better way to simulate cool roofing? Is the
sun simply too low in the sky in New England to yield substantial
savings?</FONT></FONT>
<P><FONT face=arial><FONT size=-1>Your thoughts are
appreciated.</FONT></FONT>
<P><FONT face=arial><FONT size=-1>Wade McLaughlin</FONT></FONT> <BR><FONT
face=arial><FONT size=-1>DMI</FONT></FONT></P></BLOCKQUOTE><X-SIGSEP>
<P></X-SIGSEP><FONT face="Abadi MT Condensed Light"><FONT
color=#008000><FONT size=+1>Marcus B.
Sheffer
energy & environmental consulting</FONT></FONT></FONT> <BR><FONT
face="Abadi MT Condensed Light"><FONT color=#008000><FONT size=+1>Energy
Opportunities
717-292-2636</FONT></FONT></FONT> <BR><FONT
face="Abadi MT Condensed Light"><FONT color=#008000><FONT size=+1>1200 E
Camping Area
Road Fax:
717-292-0585</FONT></FONT></FONT> <BR><FONT
face="Abadi MT Condensed Light"><FONT color=#008000><FONT
size=+1>Wellsville, PA USA
17365-9783
sheffer@sevengroup.com</FONT></FONT></FONT> <BR><FONT
face="Abadi MT Condensed Light"><FONT color=#008000><FONT size=+1>a Seven
Group member company <U><A href="http://www.sevengroup.com/"
eudora="autourl">www.sevengroup.com</A></U></FONT></FONT></FONT></P></BLOCKQUOTE></BLOCKQUOTE><PRE>
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