Reduce VAV Supply Air Duct Static Pressure according to Demand

Reduce Variable

Flow Hydronic



Pressure according to


Basis for savings is shown in the remarks column Load profile is needed to determine pet flow needed in the building, and then compare incremental flows at the two static pressures.

This calculation uses the difference in downstream duct/pipe pressure (SP1 and SP2), not the total pressure, so the :'tsp:l or "head" are the difference between the two

For summer operation, the extra fan / pump horsepower also creates new cooling load and ADDS to the measure savings.

This approach assumes a constant supply temperature Anything that raises supply temperatures will increase mass flows (air flow or water flow) and reduce measure savings.

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