Compressors, Gas Turbines and Jet Engines
Rotary compressors are used for delivering

Large quantities of air at low pressures
Large quantities of air at high pressures
Small quantities of air at high pressures
Small quantities of air at low pressures

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

Isentropic power to the power required to drive the compressor
Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
Volume of free air delivery per stroke to the swept volume of the piston
Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor

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