A piston-cylinder device initially contains 8 ft3 of helium gas at 40 psia and 70F. Helium is

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A piston-cylinder device initially contains 8 ft3 of helium gas at 40 psia and 70°F. Helium is now compressed in a polytropic process (Pv n = constant) to 140 psia and 320°F. Assuming the surroundings to be at 14.7 psia and 70°F, determine
(a) The actual useful work consumed and
(b) The minimum useful work input needed for this process.
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Thermodynamics An Engineering Approach

ISBN: 978-0073398174

8th edition

Authors: Yunus A. Cengel, Michael A. Boles

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