How to calculate fan shaft power?

P=Q×ΔP/(η×1000). Q in m³/s, ΔP in Pa, η=efficiency.

Typical fan efficiency?

Forward-curved: 60-70%. Backward: 75-85%. Airfoil: 80-90%.

Total=static+dynamic. Fan total efficiency uses total pressure.

Motor≥shaft power×1.15-1.25 safety factor.

Brake Horsepower=air power/efficiency. Motor HP must exceed BHP.

Free Engineering Tool — #160

P_shaft=Q×ΔP/(η×1000). Calculate fan brake horsepower.

P=Q×ΔP/(η×1000)BHP

Fan Shaft Power

—

Power (hp)

—

Air Power

—

Flow (m³/h)

—