[Equest-users] Ground/Water reflectance

Bishop, Bill wbishop at pathfinder-ea.com
Tue Dec 7 07:20:17 PST 2010


Alex,
 
Exterior surfaces have a "Ground reflectance" property -
GND-REFLECTANCE, accessible through the Daylighting - Shading - Other
tab of the exterior surface. Reading the DOE-2 Help description, the
reflectance value for "ocean" is 0.05, implying that most solar
radiation is absorbed, not reflected. I'm guessing that the visual glare
we perceive does not increase the solar load as much as we would think.
Sea monsters do not seem to have been considered by the DOE-2 team.
 
Regards,
Bill
 
William Bishop, PE, BEMP, LEED(r) AP | Pathfinder Engineers & Architects
LLP
Mechanical Engineer
 
 134 South Fitzhugh Street                 Rochester, NY 14608
T: (585) 325-6004 Ext. 114            F: (585) 325-6005
wbishop at pathfinder-ea.com           www.pathfinder-ea.com
<http://www.pathfinder-ea.com/> 
P   Sustainability - the forest AND the trees. P* 
________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of John
Aulbach
Sent: Monday, December 06, 2010 8:35 PM
To: Alex Krickx; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Ground/Water reflectance
 
Alex:
 
I wonder if the turbidity (word ??) of the water will actually not make
a difference. Any harbor will have boats, wind effects, and an
occasional sea monster disturbing the "glass" water.
 
Only in paintings ???
 
John R. Aulbach, PE, CEM
Senior Energy Engineer
________________________________

Partner Energy
1990 E. Grand Avenue, El Segundo, CA 90245
W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745
www.ptrenergy.com <http://www.ptrenergy.com/>  
<mailto:%7C%20jaulbach at ptrenergy.com> | jaulbach at ptrenergy.com
 
 
 
________________________________

From: Alex Krickx <akrickx at seriousmaterials.com>
To: "equest-users at lists.onebuilding.org"
<equest-users at lists.onebuilding.org>
Sent: Mon, December 6, 2010 5:11:24 PM
Subject: [Equest-users] Ground/Water reflectance
Hello everyone,
 
I've got a building that is located at the edge of a harbor with the
water directly to the south of it. How do I model a reflective surface
on the ground that represents the harbor? I feel this is key to include,
as this reflectivity will send additional heat through the windows. I
looked through the archives but didn't see anything related to ground
reflectivity.
 
If anyone knows how to create reflective objects and/or an appropriate
value of reflectivity for water in eQUEST, that would be most helpful.
 
Thanks in advance!
 
Regards,
Alex Krickx
 
 
Alex Krickx
Building Energy Specialist
 
1250 Elko Dr, Sunnyvale, CA 94089
(t) 408.541.8124
 
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