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.
Tyler Thumma
7GroupLEEDuser Expert
60 thumbs up
March 25, 2020 - 3:15 pm
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.