A refrigerator is maintained at 5°C by removing heat from the refrigerated space at 18,000 kJ/hr. The power input to the refrigerator is 1500 W and the surrounding air is at 36° C. Determine:
a. The reversible power input, in kW.
b. The rate of irreversibility, in kW.
c. The second-law efficiency of the refrigerator.