Hello,

I am working on the energy modeling of a non residential building of
conditioned area greater than 3,00,000 sq ft following ASHRAE 90.1 Appendix
G.
As per ASHRAE 90.1-2004 Table G3.1.1A it comes under system 8 , and ASHRAE
90.1-2004 Table G3.1.3.7 (Type and number of chillers) says that it should
be "2 centrifugal chillers minimum with chiller added so that no chiller is
larger than 800 tons, all sized equally."
After a sizing run of the model, the tonnage came out to be approximately
1000 tons.
I can divide this into 2 x 500 tons chiller or into 4 x 250 tons chillers.
In each case the COP of the chiller vary.
Which is the correct way of giving the size and number of chillers.

Thanks & Regards,

Surekha Tetali