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A heat pump with refrigerant-134 as the working fluid is used to keep a space at ( 25 Celsius ) by absorbing heat from geothermal water that enters the evaporator at ( 50 C) at a rate of 0.065 kg/s and leaves at (40C). The refrigerant enters the evaporator at ( 20 C) with a quality of 23 percent and leaves at the inlet pressure as saturated vapor. The refrigerant loses 300 W of heat to the surroundings as it flows through the compressor and the refrigerant leaves the compressor at 1.4 MPa 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 the COP of the heat pump, and (d) the theoretical minimum power input to the compressor for the same heating load.
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