Question

0.5 kilograms of air are compressed from 100 kPa and 300 K in a polytropic process,...

0.5 kilograms of air are compressed from 100 kPa and 300 K in a polytropic process, n = 1.3, to a state where V2 = 0.5 V1. The air is further compressed at constant pressure until the final volume is 0.2 V1 . Draw a sketch of the processes on a p-V diagram. Determine the work for each process.

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Answer #1

In this problem, first of all draw the process on the P-V diagram then calculate pressure and Volume at each state and then calculate the work for both process as below:

Note:- The negative sign shows that the work done on the system.

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