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

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

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Compressors, Gas Turbines and Jet Engines
If p₁ is the pressure of air entering the L.P, cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

D₁/D₂ = (p₃/p₁)1/4
D₁/D₂ = (p₁/p₃)1/4
D₁/D₂ = (p₁ p₃)1/2
D₁/D₂ = (p₁ p₃)1/4

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