Air enters the compressor of a gas refrigeration system with a regenerator at -28 C at...

 

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Air enters the compressor of a gas refrigeration system with a regenerator at -28 C at a flow rate of 0.75 kg/s. The cycle has a pressure ratio of four. The temperature of the air decreases from 12 to -35 C in the regenerator. The isentropic efficiency of the compressor is 85% and that of the turbine is 80%. Determine (a) the rate of refrigeration and the COP of the cycle and (b) the minimum power input, the second-law efficiency of the cycle, and the total exergy destruction in the cycle. The temperature of the cooled space is-40•C and heat is rejected to the ambient at 7•C. Use constant specific heat for air at room temperature with cp =1.005 kJ/kg-K andk =1.4. (c) Determine the minimum power input, the second-law efficiency of the cycle, and the total exergy destruction in the cycle if the temperature of the cooled space is -20•C. Air enters the compressor of a gas refrigeration system with a regenerator at -28 C at a flow rate of 0.75 kg/s. The cycle has a pressure ratio of four. The temperature of the air decreases from 12 to -35 C in the regenerator. The isentropic efficiency of the compressor is 85% and that of the turbine is 80%. Determine (a) the rate of refrigeration and the COP of the cycle and (b) the minimum power input, the second-law efficiency of the cycle, and the total exergy destruction in the cycle. The temperature of the cooled space is-40•C and heat is rejected to the ambient at 7•C. Use constant specific heat for air at room temperature with cp =1.005 kJ/kg-K andk =1.4. (c) Determine the minimum power input, the second-law efficiency of the cycle, and the total exergy destruction in the cycle if the temperature of the cooled space is -20•C.

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