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Fans - Calculate Air and Brake Horsepower

AHP - Air Horse Power and BHP - Brake Horse Power.

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Air Horse Power - AHP

Assuming 100% efficiency AHP is the power required to move a given air volume against a given pressure. AHP can be expressed as

P_AHP = q dp_inWG SG / 6356 (1)

where

P_AHP = Air Horse Power (hp)

q = air flow (cfm)

SG = Specific Gravity Air (= 1.0)

dp_inWG = total pressure (in. W.G)

Brake Horse Power - BHP

Brake horsepower is the actual power delivered to or by a shaft.

The actual power - brake horse power - a fan requires, because no fan is 100% efficient, can be expressed as

P_BHP = q dp_inWG / μ 6356 (2)

where

P_BHP = Brake Horse Power (hp)

μ = fan efficiency

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Related Topics

Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Related Documents

Fan Affinity Laws - The affinity laws can be used to calculate resulting volume capacity, head or power consumption when speed or wheel diameters are changed.
Fan AMCA Classification - Fan classification established by AMCA.
Fans - Efficiency and Power Consumption - Power consumption and typical efficiencies of fans
Fans - Volume Flow, Pressure Head and Power Consumption vs. Air Temperature and Density - The temperature and density of the air influences on the volume flow, pressure head and power consumption in a fan.
Pumps - Specific Speed - Characterizing of impeller types in pumps in a unique and coherent manner.
Types of Fans - Axial and propeller fans, centrifugal (radial) fans, mixed flow fans and cross flow fans.
Types of Fans - Capacity Ranges - Centrifugal, axial and propeller fans and their capacity ranges.

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