Fans and Blower Horsepower Equation

Industrial Electric Motor Application, Design

Fans and Blower Horsepower Equation

The following is a generic equation to determine the required horsepower to drive the fan or blower element . This equation does not compensate for temperature, density or airflow charateristics of any particular fan or blower.

Equation:

P = (Q x p)/(229 x )

or

P = (Q x PF)/(33,000 x )

or

P = (Q x Pw)/(6356 x )

Where:

P = Power, hp
Q = Flow Rate, cfm
p = Pressure, lb/in2
Pf = Pressure, lb/ft2
Pw = Water Gauge, Inches
= Efficiency coefficient