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Air enters the turbocharger compressor (of an automotive engine at 100 kPa, 30°C, and exits at 170 kPa. The air is cooled by 50°C in an intercooler before entering the engine. The isentropic efficiency of the compressor is 75%. Determine the temperature of the air entering the engine and the irreversibility of the compression-cooling process. 

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(a)  Compressor.

First ideal which is reversible adiabatic, constant s: 

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