Hi all,

I know they always say there's no such thing as a stupid question, but I've been looking through ASHRAE 90.1 table 6.8.1 as well as I know how, and I cannot find the required efficiency rating for a water source heat pump with a capacity greater than 135,000 BTU/hr. We're trying to model Multistack heat pump/chillers, and we're using the 70-ton model, which correlates to about 840,000 BTU/hr.

Has anyone ever modeled a water source heat pump larger than 135 MBH, and if so, which efficiency did you use? I know I'm absolutely horrible at where's waldo, so there's a good chance I've just overlooked it. Any help or advice is as always appreciated. Thanks.

Daniel I. Deese