[BLDG-SIM] "Cool Roofing"

[Tracy Cornish]

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 at taylor-engineering.com 
www.taylor-engineering.com 


-----Original Message-----
From: Wade McLaughlin [mailto:wmclaughlin at dmiinc.com]
Sent: Monday, October 07, 2002 10:55 AM
To: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] "Cool Roofing"


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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