A computer facility in the Sahara Desert is to be maintained at 15° C by a vapor-compression refrigeration system that uses water as the refrigerant. The water leaves the evaporator as a saturated vapor at 10° C. The compressor is reversible and adiabatic. The pressure in the condenser is 0.01MPa and the water is saturated liquid as it leaves the condenser. Determine:

(a) The coefficient of performance for the cycle

(b) The power input per unit mass flow rate of water (kJ/kg).