An ideal vapor-compression heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20°C when the outside temperature is 5°C. Saturated vapor at 2.4 bar leaves the evaporator, and saturated liquid at 8 bar leaves the condenser. Calculate:
a) the power input to the compressor, in kW
b) the coefficient of performance
c) the coefficient of performance of a Carnot heat pump cycle operating between thermal reservoirs at 20 and 5°C