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Air undergoes two processes in series:

PROBLEM 1

Air undergoes two processes in series:

Process 1-2: Polytropic compression, with n = 1.3, from p1 = 110 kPa, V1 = 0.5 m3 to  V2 = .1 m3

Process 2-3: Constant pressure process to V3 = V1


Determine the work done in each process and comment on the direction of work. Then, determine the net work from Process 1 - 3. (You may assume air to behave as ideal gas throughout process)


PROBLEM 2 

Air is compressed isothermally in a piston cylinder. If the initial pressure is 40 psia, the initial temperature is 200°F, the initial volume is 1000 in3, and the final volume is 100 in3, find the work done.

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Answer #1

Sol rable 1.3 P1Pa Vi 0.5m3 Het 2 1.3 P 110 (0.5 0. I 289,13-55 113. 16 K hanrk done 3- 1 is So to tal net wan dome Wi 113, 220F 366.48k

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