Question

A piston-cylinder device initially contains 0.15 kg of air initially at 2 MPa and 350℃. The air first expanded isothermally to 600 kPa, then compressed polytropically with a polytropic exponent of 1.1 to the initial pressure, and finally compressed at the constant pressure to the initial state. Determine the boundary work for each process

and the net work of the cycle.

Step 1

Question is to find the boundary work for each process and net work of the cycle.

The cyclic process undergone by air is as shown in the figure below.

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