Answered: A piston–cylinder device, initially…

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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A piston–cylinder device, initially containing 0.25-kg steam at 3.5 MPa, is superheated
by 4°C, i.e., the saturation temperature is raised by 4°C. Afterwards, the steam loses heat
to the surroundings such that the piston moves down, hitting the stops; the cylinder
contains saturated liquid water at this point. Hint: what is the type of boundary work
done here? Is the work done by or done on the system? The cooling continues until the
cylinder contains water at 205°C. Determine (a) the final pressure, in kPa, (b) the quality
at the final state, (b) the boundary work from state 1 to state 2, in kJ, (c) the amount of
heat transferred when the piston first hits the stops, in kJ, (d) and the total amount of
heat transferred for the system, in kJ. Is this heat added to or removed from the system?

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