A heat pump operates on the ideal vapor-compression cycle with refrigerant-134a as the working fluid. This heat pump is used to keep a space at 25 °C by absorbing heat at the rate of 2.7 kW from geothermal water flowing through the evaporator. The evaporator operates at 20°C, and the condenser operates at 1400 kPa. The compressor receives work equal to 20 kJ for each kilogram of refrigerant flowing into it.
(a) Sketch the hardware and the T-s diagram for this heat pump.
(b) Determine the rate of heat transfer to the heated space at 25°C.
(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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