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Hi all, In E+, ASHRAE standard 90 (App. G) and in some other places,
fan power for VAV systems with variable speed drives is modeled as a
given function of part load ratio. I think the theory behind this originally
comes from BLAST. This must be based on assumptions for the shape of the fan
efficiency curve and on the pressure characteristic and control of the VAV
system. Does anyone have access to the original theory on this? Alternatively,
can anyone explain why and when the “single curve for all fans and
systems” approach works? Best regards, Per Sahlin |