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Air enters an insulated compressor operating at steady state at 1.05 bar, 23 C with a mass flow rate of 1.8 kg/s and exits at 2.9 bar. Kinetic and potential energy effects are negligible.

(a) Determine the minimum theoretical power input required, in kW, and the corresponding exit temperature, in C.

(b) If the exit temperature is 147 C, determine the power input, in kW, and the isentropic compressor efficiency.

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Refrigerant 134a enters a compressor operating at steady state as saturated vapor at 4 C and exits at a pressure of 14 bar. The isentropic compressor efficiency is 75%. Heat transfer between the compressor and its surroundings can be ignored. Kinetic and potential energy effects are also negligible. Determine

(a) the exit temperature, in C.

(b) the work input, in kJ per kg of refrigerant flowing.

 
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