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

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

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Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Heated
Bled gas from turbine is heated and readmitted for complete expansion
Exhaust gases drive the compressor
Compressed air before entering the combustion chamber is heated

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