Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Work to compress air isothermally to work for actual compression
Power to drive compressor to isothermal h.p.
Isothermal h.p. to the BHP of motor
Isothermal h.p. to adiabatic h.p.

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Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Gauge discharge pressure to the gauge intake pressure
Absolute discharge pressure to the absolute intake pressure
Stroke volume and clearance volume
Pressures at discharge and suction corresponding to same temperature

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