[BLDG-SIM] Green Roofs
Nikhil Kapur
energy_news2002 at yahoo.com
Tue Feb 22 14:39:56 PST 2005
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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