Fan & Blower Power

Shaft and electrical power of a fan from its air flow and pressure rise, plus annual energy use.

Unit system

Inputs

Air flow (at operating conditions)

Pressure rise

Duct resistance plus filter plus burner. Every pascal over-estimated is a fan that runs throttled for life.Inlet pressure (absolute)

Air temperature

A stack fan moves hot gas: the density drops, so the same mass needs more volume — and more power.Fan efficiency

Motor efficiency

Annual operating hours

Electricity price

Electrical power

3.175kW

Annual electricity cost

1,810€

The compression is treated as incompressible. Once the pressure rise passes a few percent of the inlet pressure (blowers, compressors) a compressible calculation is needed.
The flow is at OPERATING conditions. If given in normal cubic metres it must be converted first; on hot flue gas the difference can be a factor of two.

A PDF carrying the inputs, results, assumptions and the source. A one-time code is sent to your address.

Results are for engineering pre-assessment and are not a product selection commitment. Final responsibility rests with the user.