2. A heat pump working with R134a is used to heat water for a hot-water supply. The evaporator temperature is 15C and the condenser temperature is 60C. The compressor efficiency is 80%. (a) Determine the COP the heat pump (b) If the amount of hot water needed is 0.1kg/s, determine the amount of energy saved by using the heat pump instead of directly heating the water from 15 to 60C(Cp(water)=4.18kJkg1K1)