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Whenever we have modeled this in the Northeast we also have seen
negligible savings using PowerDOE and others.<br>
<br>
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. <br>
<br>
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.<br>
<br>
Now when it comes to the urban heat island effect it can have a
tremendously positive impact . . . but that is another issue.<br>
<br>
<br>
At 01:55 PM 10/07/2002 -0400, you wrote:<br>
<blockquote type=cite class=cite cite><font face="arial" size=2>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><br>
<br>
<font face="arial" size=2>My questions:</font><br>
<font face="arial" size=2>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><br>
<br>
<font face="arial" size=2>Your thoughts are appreciated.</font><br>
<br>
<font face="arial" size=2>Wade McLaughlin<br>
DMI</font></blockquote>
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<font face="Abadi MT Condensed Light" size=4 color="#008000">Marcus B.
Sheffer
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Energy
Opportunities
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Fax: 717-292-0585 <br>
Wellsville, PA USA 17365-9783
sheffer@sevengroup.com<br>
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