The power input to the compressor of R-134a vapor compression plant is 80 kW. R-134a at the compressor inlet is at -20C and 1bar. After the compression, the vapor is at 20bars, the compressor has an isentropic efficiency of 80%. And the liquid refrigerant at the condenser outlet is saturated. Water from a river at 20C is used as a heating medium for the evaporator. 1 Determine the specific energy exchanged during each process of this cycle 2) Calculate COPHP 3) Calculate the mass flow rate of the water used to provide heat to the evaporator. Assuming that the water leaves the evaporator at 7C.