[BLDG-SIM] Green Roofs

[Ferguson, Alex]

The Institute of Research and Construction (IRC, part of the National
Research Council of Canada) has conducted a fair amount of research in this
area. Much of this work, including hydrology modelling, experimental
investigations and Visual DOE simulations, is summarized in the following
report:

http://irc.nrc-cnrc.gc.ca/fulltext/nrcc46737/

...
Alex Ferguson
CANMET Energy Technology Centre
Natural Resources Canada
P:+1 613 995 3294
F:+1 613 996 9909
Alex.Ferguson at nrcan.gc.ca




-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com]On Behalf Of Brian Thornton
Sent: Monday, February 28, 2005 11:40
To: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] Green Roofs


 
One issue with Green Roofs that has come up, is analyzing potential energy
savings benefits from evaporation, and plant evapo-transpiration.  There is
at least one program out there that apparently addresses this.  
 
1)       Are there opinions on whether these effects generate credible
supportable energy savings from typical green roof installations?
 
2)       Does anyone know of a standard methodology that could be
incorporated in a broad energy simulation such as eQuest?
 
3)       Has anyone received approval from USGBC or a utility incentive
program to claim energy savings from these effects, and if so what kind of
documentation was used? 
 
Thanks-Brian Thornton
 
Thornton Energy Consulting
p. 503-231-6600 f. 503-231-3555
thorntonenergy at comcast.net
 



From: postman at gard.com [mailto:postman at gard.com] On Behalf Of Nikhil Kapur
Sent: Tuesday, February 22, 2005 2:40 PM
To: BLDG-SIM at GARD.COM
Subject: [BLDG-SIM] Green Roofs
 
Hi  Dan,
 
You can use a reflectance of 0.70 or greater i.e. absorptance of 0.3 or less
for the roof. Also the effect of the U-value of the roof construction will
change so you will have to set a multiplier for the u-vlaue of the roof.
This can be referenced in the ASHRAE 90.1 - 1999 Users manual in the
Building Envelope section - page 5-20 table 5-E which gives the Roof
U-factor multipliers for the various climate zones.
 
Regards,
 
Nikhil



Dan Sobrinski <sobrinski at econergy.net> wrote:
Hi,
 
I am looking for some advice on modeling a green roof in Equest.
Specifically, what should I set Surface Roughness and Ext. Color
(absort) too?  Are there any other parameters that need to be modified to
simulate a vegetated roofing system?
 
Thanks in advance 
 
Dan Sobrinski, CEM, LEED AP 
Associate Engineer
Econergy International Corporation
3825 Iris Avenue, Suite 350
Boulder, CO  80301
303-473-9007  voice
303-473-9060  fax
sobrinski at econergy.net



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