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Practice Final - Name ME 326 Final Exam Dr M J Hall May 9...

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Name_____________________________ ME 326 Final Exam Dr. M. J. Hall May 9, 2001 1)___________/25 pts 2)___________/25 pts 3)___________/25 pts 4)___________/25 pts
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Please! Be neat, write out equations before inserting numbers, and circle your answers. If you cannot figure out one part, assume an answer and carry it through the other parts. 1. (25%) The reservoir tank of the drinking water fountain on the 7th floor of the Mechanical Engineering Building initially contains 2 kg of chilled water at 15 ˚ C and a pressure of 200 kPa. Dr. Hall comes by and removes 0.5 kg of the 15 ˚ C, 200 kpa water for his coffee machine. An automatic valve then opens and fills the reservoir with 0.7 kg of water that is at 25 ˚ C and 300 kPa in the pipe. During the filling process and before the refrigeration unit comes on 5 kJ of heat passes from the surroundings to the reservoir. The temperature of the surroundings is 20 ˚ C. You may neglect the pressure dependence on the enthalpy of the water. Consider the initial state to be before the water was removed and the final state to be after the water and heat has been added.
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