An actual refrigerator operates on the vapor-compression refrigeration cycle with refrigerant-22 as the working fluid. The refrigerant evaporates at - 15oC and condenses at 40oC. The isentropic efficiency of the compressor is 83 percent. The refrigerant is superheated by 5oC at the compressor inlet and subcooled by 5oC 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
state 1: compressor inlet, state 2: compressor exit, state 3: condenser exit, state 4: evaporator inlet.