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?
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?
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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Question
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?
Transcribed Image Text:Steam
3.5 MPa
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