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

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

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Compressors, Gas Turbines and Jet Engines
Inter-cooling in gas turbine results in

Decrease in both thermal efficiency and net output
Increase in net output but decrease in thermal efficiency
Increase in both thermal efficiency and net output
Increase in thermal efficiency but decrease in net output

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