Compressor Efficiency Calculator

ASME PTC 10

Compressor Efficiency Calculator
Calculate and convert between polytropic and isentropic efficiency for centrifugal compressors. Polytropic efficiency is preferred as it remains constant across pressure ratios.

Calculation Mode

Input Efficiency

%

Gas Properties

Cp/Cv
-

Polytropic vs Isentropic

  • Polytropic: 75-85% typical (centrifugal)
  • Isentropic: 70-82% typical (centrifugal)
  • Relationship: ηs < ηp always
  • ηp is constant across stages
  • ηs varies with pressure ratio

Standards & References

  • ASME PTC 10
    Performance Test Code for Compressors
  • GPSA
    Section 13: Compressors