A 120 w fan is used to distribute the air in the room

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Unformatted text preview: tainer that has a mass of 75 lbm when empty is filled with liquid water. Initially, both the steel tank and the water are at 120°F. Now heat is transferred, and the entire system cools to the surrounding air temperature of 70°F. Determine the total entropy generated during this process. 7–168 Air enters the evaporator section of a window air conditioner at 100 kPa and 27°C with a volume flow rate of 6 m3/min. The refrigerant-134a at 120 kPa with a quality of 0.3 enters the evaporator at a rate of 2 kg/min and leaves as saturated vapor at the same pressure. Determine the exit temperature of the air and the rate of entropy generation for this process, assuming (a) the outer surfaces of the air conditioner are insulated and (b) heat is transferred to the evaporator of the air conditioner from the surrounding medium at 32°C at a rate of 30 kJ/min. Answers: (a) 15.5°C, 0.00188 kW/K, (b) AIR 100 kPa 27°C 6°C 18°C 11.2°C, 0.00222 kW/K R-134a Q 120 kPa x = 0.3 AIR Sat. vapor FIGURE P7–164 7–165 A well-insulated 4-m 4-m 5-m room initia...
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