SpecialProblems6-7 (1)

SpecialProblems6-7 (1) - 3 /kg and 2537 kJ/kg,...

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Special Problems for ME 200 – Fall 2011 Special Problems 6 and 7 Due Friday, September 9, 2011 SP6: A gas contained in a piston-cylinder device undergoes three processes in series. Process 1-2: Constant pressure compression from P 1 = 10 bar and V 1 = 10 m 3 (state 1) to V 2 = 5 m 3 (state 2) Process 2-3: Polytropic expansion such that PV 1.2 = constant Process 3-1: Constant volume (a) Show the processes on a P-V diagram. Label the states and show property values. (b) Calculate work (kJ) for each process. SP7: A piston-cylinder device initially contains 0.8 m 3 of water vapor at 250 kPa. The specific volume and specific internal energy of water vapor at the initial condition are 0.72 m
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Unformatted text preview: 3 /kg and 2537 kJ/kg, respectively. At this condition, the piston is resting on a set of stops and the mass of piston is such that a pressure of 300 kPa is required to move it. Heat transfer is allowed to occur slowly so that the volume of water vapor doubles. The specific internal energy at the final condition is 3410 kJ/kg. (a) Show the entire process on a P-V diagram. (b) What is the total work done (kJ) during the process? (c) Determine the total amount of heat transfer (kJ) during the process....
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