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ENGINEERING TOOL

Compressor Power Calculator

Estimate ideal isentropic power, shaft power and electrical input for single-stage air compression.

Compressor Power Calculator

FREE ONLINE TOOL

Ideal isentropic power

4.761 kW

Shaft power

6.348 kW

Electrical input

7.0534 kW

Pressure ratio

7.9085

Formula and assumptions

Pis = k/(k−1) × P1 × Q1 × [(P2/P1)^((k−1)/k) − 1]; Pshaft = Pis/ηis; Pelec = Pshaft/ηmotor; k = 1.4

Use absolute pressures and actual volumetric flow at the inlet. Single-stage ideal-gas air model with k = 1.4; excludes intercooling, auxiliaries and package losses. Isentropic power is not the isothermal minimum. Compare with manufacturer package input data.

Technical reference: Atlas Copco — Compressed Air Manual

STEP BY STEP

How to use compressor power calculator

  1. Check the input units and assumptions.
  2. Review the result and example.

IN PRACTICE

Example

P1 = 1.01325 bar(a); P2 = 8.01325 bar(a); Q1 = 1 m³/min; ηis = 75%; ηmotor = 90%.

GOOD TO KNOW

Which model does this calculator use?

Use absolute pressures and actual volumetric flow at the inlet. Single-stage ideal-gas air model with k = 1.4; excludes intercooling, auxiliaries and package losses. Isentropic power is not the isothermal minimum. Compare with manufacturer package input data.

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