Show transcribed image text 6-108 An air-conditioner with refrigerant-134a as the working fluid is used to keep a room at 23°C by reject- ing the waste heat to the outdoor air at 34°C. The room gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer, TV and lights amounts to 900 W. The refrigerant enters the com pressor at 400 kPa as a saturated vapor at a rate of 80 L/min and leaves at 1200 kPa and 70°C. Determine (a) the actual COP, (b) the maximum flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions. Answers: (a) 4.33, (b) 26.9, (c) 12.9 Umin COP, and (c) the minimum volume QI 1.2 MPa valve Evaporator 400 kPa sat. vapor FIGURE P6-108
6-108 An air-conditioner with refrigerant-134a as the working fluid is used to keep a room at 23°C by reject- ing the waste heat to the outdoor air at 34°C. The room gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer, TV and lights amounts to 900 W. The refrigerant enters the com pressor at 400 kPa as a saturated vapor at a rate of 80 L/min and leaves at 1200 kPa and 70°C. Determine (a) the actual COP, (b) the maximum flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions. Answers: (a) 4.33, (b) 26.9, (c) 12.9 Umin COP, and (c) the minimum volume QI 1.2 MPa valve Evaporator 400 kPa sat. vapor FIGURE P6-108
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