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Air is compressed in an axial-flow compressor operating at steady state from 27 C, 1 bar to a pressure of 2.1 bar. The work input required is 94.6 kJ per kg of air flowing through the compressor. Heat transfer from the compressor occurs at the rate of 14 kJ per kg at a location on the compressor’s surface where the temperature is 40 C. Kinetic and potential energy changes can be ignored. Determine

(a) the temperature of the air at the exit, in C.

(b) the rate at which entropy is produced within the compressor, in kJ/K per kg of air flowing.

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