An actual refrigerator operates on the vapor-compression refrigeration cycle with refrigerant-22 as the working fluid. The refrigerant evaporates at −15°C and condenses at 40°C. The isentropic efficiency of the compressor is 83 percent. The refrigerant is superheated by 5°C at the compressor inlet and subcooled by 5°C at the exit of the condenser. Determine (a) the heat removed from the cooled space and the work input, in kJ/kg and the COP of the cycle. Determine (b) the same parameters if the cycle operated on the ideal vapor-compression refrigeration cycle between the same evaporating and condensing temperatures.
The properties of R-22 in the case of actual operation are: h1, = 402.49 kJ/kg, h2 =454.00 kJ/kg, h3 = 243.19 kJ/kg
The properties of R-22 in the case of ideal operation are: h1 = 399.04 kJ/kg, h2 = 440.71 kJ/kg, h3 = 249.80 kJ/kg Note: state 1: compressor inlet, state 2: compressor exit, state 3: condenser exit, state 4: evaporator inlet.
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