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Prob. 4-68 A piston–cylinder device contains 2.2 kg of nitrogen initially at 100 kPa and 25C....

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Mechanical Engineering

Prob. 4-68 A piston–cylinder device contains2.2 kg of nitrogen initially at 100 kPa and 25C. The nitrogen isnow compressed slowly in a polytropic process during which PV^1.3 =constant until the volume is reduced by one-half. Determine thework done and the heat transfer for this process.

4–69    Reconsider Prob. 4–68. UsingEES (or other) software,plot the process described in the problemon a P-V diagram, and investigate the effect of the poly- tropicexponent n on the boundary work and heat transfer. Let thepolytropic exponent vary from 1.0 to 1.4. Plot the boundary workand the heat transfer versus the polytropic exponent, and discussthe results.

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