Refrigerant 134a as saturated vapor at 2108C enters a

Chapter 7, Problem 7.121

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Refrigerant 134a as saturated vapor at 210\(^{\circ}\)C enters a compressor operating at steady state with a mass flow rate of 0.3 kg/s. At the compressor exit the pressure of the refrigerant is 5 bar. Stray heat transfer and the effects of motion and gravity can be ignored. If the rate of exergy destruction within the compressor must be kept less than 2.4 kW, determine the allowed ranges for (a) the power required by the compressor, in kW, and (b) the exergetic compressor efficiency. Let \(T_{0}\) = 298 K, \(p_{0}\) = 1 bar.