ME 3310 Final: me3310finalsummer14
31 Jan 2019
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Open book, closed notes, do not write on this sheet. Problem 1: (25 points) a reversible heat engine receives energy from a solar collector at a temperature of. 80 c, and rejects heat to the surroundings at 25 c. The solar collector converts 50 percent of the incident solar energy into usable thermal energy. Problem 2: (10 points) a piston-cylinder device contains 5 kg of saturated water vapor at 3 mpa. Now heat is rejected from the cylinder at constant pressure until the water vapor completely condenses so that the cylinder contains saturated liquid at 3 mpa at the end of the process. Determine the entropy change of the system during this process. Problem 3: (25 points) a carnot refrigerator rejects a heat transfer of 2. 5 103 kj at 80 c. If wnet for this refrigerator is 1. 1 103 kj, find the coefficient of performance.
