Compressors, Gas Turbines and Jet Engines
Free air is the air at

15°C and 1 kg/cm²
20°C and 1 kg/cm² and relative humidity of 36%
Atmospheric conditions at any specific location
0°C and standard atmospheric conditions

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Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle with clearance on P-V diagram can be represented by following processes

Two adiabatic and two isobaric
Two adiabatic, one isobaric and one constant volume
One adiabatic, two isobaric, and one constant volume
One adiabatic, one isobaric and two constant volumes

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