A piston-cylinder device contains 0.05 kg of steam at 1 MPa and 300°C. Steam now expands to a finalstate of 200 kPa and 150°C, doing work. Heat losses from the system to the surroundings are estimatedto be 2 kJ during this process. Assuming the surroundings to be at T₁ =25°C and P = 100 kPa, determine(a) the exergy of the steam at the initial and the final states, (b) the exergy change of the steam, (c) theexergy destroyed, and (d) the second-law efficiency for the process.0P₁ = 1 MPT₁ = 300°CState 1Po= 100 kPaTo = 25°C2 kJSteamP₂= 200 kPaT₂ = 150°CState 2

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A piston-cylinder device contains 0.05 kg of steam at 1 MPa and 300°C. Steam now expands to a final state of 200 kPa and 150°C, doing work. Heat losses from the system to the surroundings are estimated to be 2 kJ during this process. Assuming the surroundings to be at To =25°C and Po= 100 kPa, determine (a) the exergy of the steam at the initial and the final states, (b) the exergy change of the steam, (c) the exergy destroyed, and (d) the second-law efficiency for the process.

A piston-cylinder device contains 0.05 kg of steam at 1 MPa and 300°C. Steam now expands to a final state of 200 kPa and 150°C, doing work. Heat losses from the system to the surroundings are estimated to be 2 kJ during this process. Assuming the surroundings to be at To =25°C and Po= 100 kPa, determine (a) the exergy of the steam at the initial and the final states, (b) the exergy change of the steam, (c) the exergy destroyed, and (d) the second-law efficiency for the process.

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 contains 0.05 kg of steam at 1 MPa and 300°C. Steam now expands to a final
state of 200 kPa and 150°C, doing work. Heat losses from the system to the surroundings are estimated
to be 2 kJ during this process. Assuming the surroundings to be at T₁ =25°C and P = 100 kPa, determine
(a) the exergy of the steam at the initial and the final states, (b) the exergy change of the steam, (c) the
exergy destroyed, and (d) the second-law efficiency for the process.
0
P₁ = 1 MP
T₁ = 300°C
State 1
Po= 100 kPa
To = 25°C
2 kJ
Steam
P₂= 200 kPa
T₂ = 150°C
State 2

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