A heat pump with refrigerant-134a as the working fluid is used to keep a space at 25C by absorbing heat from geothermal water that enters the evaporator at 508C at a rate of 0.065 kg/s and leaves at 40C. The refrigerant enters the evaporator at 20C 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.
A heat pump with refrigerant-134a as the working
fluid is used to keep a space at 25C by absorbing heat from
geothermal water that enters the evaporator at 508C at a rate
of 0.065 kg/s and leaves at 40C. The refrigerant enters the
evaporator at 20C 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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