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.
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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 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
Transcribed Image Text: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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