[Bldg-sim] VAV fan energy

Per Sahlin per.sahlin at equa.se
Wed Apr 29 07:45:30 PDT 2009


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

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