(Q1) A piston-cylinder device contains 3.8 kg of hydrogen at 1250 kPaand 350°C is expanded according to the relation PV1.28 = C to 130kPa. Then the gas is compressed isothermally to the initial pressure.Finally, the gas undergoes a constant pressure process to return to theinitial state. Determine (a) the temperature after the polytropicexpansion, (b) the work done during each process, (c) the net work doneof the cycle and (d) the net amount of the heat transfer.

Given data P1= 1250 kPa P2= 130 kPa T1= 350 0C m= 3.8 kg PV1.28= Conctant

Answered: is expar a. Then the gas i 350°C ally,…

Engineering

Mechanical Engineering

is expar a. Then the gas i 350°C ally, the gas und

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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(Q1) A piston-cylinder device contains 3.8 kg of hydrogen at 1250 kPa
and 350°C is expanded according to the relation PV1.28 = C to 130
kPa. Then the gas is compressed isothermally to the initial pressure.
Finally, the gas undergoes a constant pressure process to return to the
initial state. Determine (a) the temperature after the polytropic
expansion, (b) the work done during each process, (c) the net work done
of the cycle and (d) the net amount of the heat transfer.

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