8-112E A piston-cylinder device initially contains 15 ft3 of helium gas at 25 psia and 70°F. Helium is now compressed in a polytropic process (PVn = constant) to 70 psia and 300°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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