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A piston-cylinder device contains 0.25 kg of air initially at 2 MPa and 325C. The air is first expanded isothermally to 300 kPa, then compressed...
A piston–cylinder device contains 0.25 kg of air initially at 2 MPa and 325°C. The air is firstexpanded isothermally to 300 kPa, then compressed polytropically with a polytropicexponent of 1.2 to the initial pressure, and finally compressed at the constant pressure to theinitial state. Determine the boundary work for each process and the net work of the cycle.[5](b.) Reconsider part (a.) using the EES software. Plot the process described in the problem on aP-V diagram, and investigate the effect of the initial pressure on the net boundary work. Letthe initial pressure vary from 0.5 MPa to 3.5 MPa. Plot the net boundary work versus theinitial pressure, and discuss the results.
