A ground-coupled heat pump operates on the ideal vapor-compression cycle with refrigerant-134a as the working fluid. This heat pump has a COP equal to 6 in this cooling mode and maintains a space at 25°C when absorbing heat from the space at the rate of 18 kW in the evaporator. The evaporator operates at 20°C, and the condenser operates at 1400 kPa. Ground water taken from a well at the rate of 0.32 kg/s absorbs the heat transferred from the refrigerant in the condenser.
(a) Sketch the hardware and the T-s diagram for this heat pump.
(b) If the ground water enters the condenser at 10°C, what will be the temperature of the cooling water as it is returned to the ground? Take cp = 4.18 kJ/kg•K for cooling water.
(c) Determine the COP of the heat pump.
Refrigerant-134a data: T = 20°C: hf = 79.3 kJ/kg, hg = 261.6 kJ/kg; P = 1400 kPa: hf = 127.2 kJ/kg, hg = 276.2 kJ/kg
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