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SpecialProblems6-7 - 3 of water vapor at 250 kPa The...

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Special Problems for ME 200 – Fall 2009 Special Problems 6 & 7 Due Friday, September 11, 2009 SP6: Hydrogen gas is contained in a piston-cylinder device at 14.7 psia and 15 ft 3 . At this state, a linear spring with a spring constant of 15,000 lbf/ft touches the piston but exerts no force on it. The cross-sectional area of the piston is 3 ft 2 . Heat transfer occurs to hydrogen gas by which it expands until its volume doubles. (a) Show the process on a P-V diagram. (b) Determine final pressure (psia) of hydrogen gas. (c) What is the total work done (Btu) during the expansion process? (d) What fraction of the above work (Btu) is done against the spring? SP7: A piston-cylinder device initially contains 0.8 m
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Unformatted text preview: 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 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 water vapor volume 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 work done (kJ) during the process? (c) Determine the total amount of heat transfer (kJ) during the process....
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