The refrigerant 134-a enters the compressor of a refrigeration machine as superheated vapor at a flow rate of 0.12 kg/s, a pressure of 0.14 MPa, and a temperature of -10 °C. It exits at a pressure of 0.7 MPa and a temperature of 50 °C. The refrigerant exits the condenser at a temperature of 24 °C and a pressure of 0.65 MPa and is then throttled to a pressure of 0.15 MPa. Show the cycle on a T-s diagram, including the saturated liquid and saturated vapor lines. Also, a) Calculate the heat extracted from the environment per unit time and the power required to operate the compressor, b) The isentropic efficiency of the compressor, c) The coefficient of performance of the refrigeration machine.
4.
The refrigerant 134-a enters the compressor of a refrigeration machine as superheated vapor at a flow rate of 0.12 kg/s, a pressure of 0.14 MPa, and a temperature of -10 °C. It exits at a pressure of 0.7 MPa and a temperature of 50 °C. The refrigerant exits the condenser at a temperature of 24 °C and a pressure of 0.65 MPa and is then throttled to a pressure of 0.15 MPa. Show the cycle on a T-s diagram, including the saturated liquid and saturated vapor lines. Also, a) Calculate the heat extracted from the environment per unit time and the power required to operate the compressor, b) The isentropic efficiency of the compressor, c) The coefficient of performance of the refrigeration machine.
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