A heat pump uses R-134 refrigerant for its environmental benefits, it is used to maintain a space at 80 F by absorbing heat from geothermal water that entered the evaporator at 600 R and leaves at 560 R. The refrigerant enters the evaporator at 50 F with a quality of 25%. If the compressor draws 1 HP of power, determine a) Performance coefficient b) The optimum power consumption by the compressor for the same rate of heat input