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Fans - Calculate Air and Brake Horsepower

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

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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    Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

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