Lubs Tech Compressed Air Systems Lubs Tech Compressed Air Systems

Horsepower Calculator
Horsepower Calculator

Horsepower Calculator

Horsepower calculation

The horsepower required to adiabatic compression of air can be calculated with the calculator below:

    N - number of stages

    V - volume of compressed air at atmospheric pressure (cfm)

    k - adiabatic expansion coefficient

    P2 - absolute final pressure (psi)

Theoretical horsepower required to compress one cubic foot of free air (atmospheric pressure) for single-staged, two-staged and three-staged compressors are indicated in the diagram below. In general - plus 15-20%  friction.



The power required to adiabatic (process without transfer of heat) compression of air can be expressed as

HP = [144 N P1 V k / 33000 (k - 1)] [(P2 / P1)(k - 1)/N k - 1]        

(1)

where

HP = horsepower

N = number of compression stages

k = 1.41 = adiabatic expansion coefficient

P1 = absolute initial atmospheric pressure (psi) (14.7 psi at sea level)

P2 = absolute final pressure after compression (psi)

V = volume of air at atmospheric pressure (cfm)

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Contact: Mike Maines
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Indianapolis, IN 46239
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