A heat pump with refrigerant 134-a, as the working fluid is used to keep a space at 25C by absorbing heat from geothermal water that enters the evaporator at 50C at a rate of .065kg/s and leaves at 40C. The refrigerant enters the evaporator at 20C with a quality of 23% and leaves at the inlet pressure as saturated vapor. The refrigerant loses 300W of heat to the surroundings as it flows through the compressor and the refrigerant leaves the compressor at 1.4MPa at the same entropy as the inlet.
Determine ;
A) the degrees of subcooling of the refrigerant in the condenser
B) the mass flow rate of the refrigerant,
C)the heating load and COP of the heat pump
D) the theoretical minumim power input to the compressor for the same heating load.