EngineerHub.orgWhat this calculator does
Calculates isentropic outlet temperature, corrects work for compressor efficiency and converts shaft power to electrical input using motor efficiency.
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Background
Optional reading — open any section below.
The ideal outlet temperature follows T₂s/T₁ = (p₂/p₁)(γ−1)/γ. Actual temperature rise and work are increased according to isentropic efficiency.
Pressure ratio must use absolute pressure. Using gauge pressure can cause a major error, especially at modest discharge pressure.
High pressure ratios are often split into stages with intercooling. Real-gas compressibility, changing heat capacity, cooling, leakage and mechanical losses may require vendor software or a thermodynamic property package.
Frequently Asked Questions
Practical questions about assumptions, inputs and limitations.
The calculator requires mass flow. Convert actual or standard volumetric flow using density at the defined reference state.
It is a screening estimate for an ideal gas with constant properties. Actual discharge temperature depends on cooling, efficiency and gas properties.
No. Convert both pressures to absolute units before calculating pressure ratio.