[Bldg-sim] "Horses mouth" question.

John Aulbach jra_sac at yahoo.com
Mon Oct 11 12:01:26 PDT 2010


Question on Cool Roof and the way to simulate them in eQuest.

My boss came to me with a cool roof and asked me to do a quick eQuest on it. I 
did a 25,000 sf single story office in Los Angeles, saw the roof outside 
emissivity was 0.9.  I changed it to 0.5 and the electric usage went UP. I 
change it again to 0.12 and the electric usage went up AGAIN. The HVAC is a 
standard single zone pacakge unit with furnace heat.

Am I seeing reality or what am I missing?


John R. Aulbach, PE, CEM
Senior Energy Engineer


1990 E. Grand Avenue, El Segundo, CA 90245
W: 888-826-1216, X254| D: 310-765-7295 | F: 310-817-2745
www.ptrenergy.com| jaulbach at ptrenergy.com

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