Question-and-Answer Resource for the Building Energy Modeling Community
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This is a very common dilemma for modeling against ASHRAE 90.1 as they don't provide default curve coefficients. Full load efficiency at rated conditions is easy to define but it's true there are an infinite combination of part-load curve possibilities that may equate to the same IEER/IPLV/NPLV.
I have leveraged the California Title 24 Nonresidential ACM Reference Manual (link HERE) which does provide default curve coefficients for cooling equipment. Many of the efficiency requirements for Title 24-2013 align with the requirements of ASHRAE 90.1-2010.
