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NC-2009 EAp2:Minimum Energy Performance

Energy modeling, Chiller at AHRI conditions

Hi,

I’m modeling a building which has water-cooled chillers.

It comes down that the provider has sent us the chiller specs, and the chiller efficiency was tested at no AHRI conditions (COP and NPLV).

Now appendix G specifies that proposed and baseline chillers should be modeled at AHRI conditions. So what I did was to recalculate the standard COP for the proposed chiller with the Kadj procedure(ASHRAE 90.1 Table 6.8.1J minimum efficiencies for centrifugal chillers).

I consider it isn’t fair to compare the nonstandard COP with the baseline COP since the proposed model should be modeled at AHRI conditions, so I did the reverse implementation of K-adj:

COP-adj = K-adj * COP-std, COP-std = COP-adj / K-adj

I do appreciate any thoughts on this, thanks.

https://www.ashrae.org/File%20Library/Technical%20Resources/Standards%20and%20Guidelines/Standards%20Intepretations/IC-90.1-2016-5.pdf

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Wed, 03/25/2020 - 19:15

Yes it would be appropriate to apply Interpretation IC-90.1-2016-5 to previous versions of 90.1 to calculate the standard COP to be input in the proposed model when you are only given nonstandard efficiencies. 

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