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There
is a DOE22 keyword called "OUTSIDE-EMISS" which I think can be
modified to represent a Cool Roof, along with the "ABSORPTANCE" keyword that you
mentioned. When I attempted to model a Cool Roof, I also didn't see any big
results until I found the "OUTSIDE-EMISS" keyword.
Tracy L. Cornish, P.E., Mechanical Engineer, Taylor Engineering,
LLC
1305 Marina Village
Parkway, Suite 101, Alameda CA 94501-1028
(510) 749-9135 office, (510) 749-9136 fax, (925) 381-8183
mobile
tcornish@xxxxxxxxxxxxxxxxxxxxxx
www.taylor-engineering.com
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.
My questions:
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?
Your thoughts are appreciated.
Wade McLaughlin
DMI
450 Lexington
St.
Newton, MA 02466
p 617-527-1525 x103
f
617-527-6606
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