Solved Applying the Entropy Balance Closed Systems ... Chegg PDF

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Fundamentals of Engineering Thermodynamics (8th Edition) Chapter 6, Problem 51P

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Enter question Applying the Entropy Balance: Closed Systems One kg of propane initially at 8 bar and 50oC undergoes a process to 3 bar, 20oC while being rapidly expanded in a piston–cylinder assembly. Heat transfer between the propane and its

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surroundings occurs at an average temperature of 35oC. The work done by the propane is

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measured as 42.4 kJ. Kinetic and potential energy effects can be ignored. Determine whether it is possible for the work measurement to be correct.

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Step 1 of 4 Fundamental Fundamental A First s of... s of... Course in...

Given data:

8th Edition

Mass of propane,

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10th Edition

Initial Pressure, Initial Temperature,

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Final pressure, Final temperature,

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Average temperature

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The work done by the propane gas,

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Step 2 of 4

By considering a closed system, neglecting Kinetic and potential energy, by applying energy balance we have

And the entropy equation is expressed as

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Step 3 of 4

1125

220

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By substituting these known values in energy balance equation:

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The entropy production is expressed as

Since, the entropy change is positive, which states that the work measurement is correct

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