[BLDG-SIM] Green Roofs

[Nikhil Kapur <energy_news2002@xxxxxxxxx>]

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@xxxxxxxxxxxx> 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@xxxxxxxxxxxx

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