[Equest-users] Table G 3.1.3.7

[Rakesh Desai]

Dear All,

 

1.        I had submitted energy model for certification and have received
following reply:

 

As per table G3.1.3.7, ASHRAE 90.1.2007, "as chiller auto size capacity is
more than 600 tons, centrifugal chiller should be considered". 

 

My building conditioned area is < 22296 m2 and as per model my chiller
capacity is more than 600 TR and I have to use 2 chillers. I have modeled 2
nos. screw chillers of equal capacity (auto size mode) with 5.5 COP.

 

I checked the table and no where it is written that we need to model
centrifugal chillers.

 

Can someone help me to understand where I went wrong?

 

2.        I had submitted PS E report of all rotations of base case and have
received following reply: 

Peak demand (946.52kW) reported for cooling is not matching with chiller
input (For 2*613 TR and 5.5 COP, 783kW). So cooling savings in not
justified. 

 

As per first submittal comment, I had changed my chiller to auto size mode
and the chiller capacity is selected by model and not by me. Now, I have
received above comment. What is the way out?

 

 

Thanks,

 

Rakesh Desai

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