16_InstSolManual_PDF_Part5

# 16_InstSolManual_PDF_Part5 - The Second Law of...

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16.20. Set Up: The maximum possible efficiencies is the Carnot efficiency, In this expression and must be in kelvins. and Solve: 16.21. Set Up: and For an engine, and Solve: (a) so (b) and Reflect: We assumed a Carnot cycle, because that cycle has the greatest possible efficiency for a given set of reser- voir temperatures, and The Carnot cycle is an idealized model with reversible heat flows. Any real engine will have an efficiency less than and will require a larger in order to achieve a 67% efficiency. 16.22. Set Up: Solve: (a) (b) (c) 16.23. Set Up: Solve: (a) (b) For one cycle, (c) 16.24. Set Up: For water, Solve: (a) is the heat removed from the water at to make ice at (b) 0 W 0 5 0 Q H 0 2 0 Q C 0 5 3.09 3 10 7 J 2 2.84 3 10 7 J 5 2.5 3 10 6 J. Q H 5 2 1 T H T C 2 Q C 5 2 1 297 K 273 K 2 1 2.84 3 10 7 J 2 5 2 3.09 3 10 7 J 0 Q C 0 5 mL f 5 1 85.0 kg 21 3.34 3 10 5 J / kg 2 5 2.84 3 10 7 J. 0°C. 0°C 0 Q C 0 0 Q H 0 5 0 W 0 1 0 Q C 0 . Q C Q H 5 2 T C T H . Q H , 0. Q C . 0, L f 5 3.34 3 10 5 J / kg. T H 5 297 K. T C 5 273 K, K 5 0 Q C 0 0 W 0 5 415 J 77 J 5 5.4. P 5 1 165 21 77 J 2 60 s 5 212 W. 0 W 0 5 0 Q H 0 2 0 Q C 0 5 492 J 2 415 J 5 77 J. Q H 5 2 1 T H T C 2 Q C 5 2 1 320 K 270 K 2 1 415 J 2 5 2 492 J. K 5 0 Q C 0 0 W 0 . Q C Q H 5 2 T C T H . Q C . 0. Q H , 0, 0 Q H 0 5 0 W 0 1 0 Q C 0 . e 5 W Q H 5 2.73 3 10 3 J
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Unformatted text preview: 3 10 3 J 6.45 3 10 3 J 5 0.423 5 42.3%. W 5 Q H 2 Q C 5 6.45 3 10 3 J 2 3.72 3 10 3 J 5 2.73 3 10 3 J Q C 5 2 Q H 1 T C T H 2 5 2 1 6.45 3 10 3 J 2 1 300 K 520 K 2 5 2 3.72 3 10 3 J. e 5 W Q H . Q H . 0. Q C , 0, Q C Q H 5 2 T C T H . W 5 Q H 2 Q C . T H e Carnot T H . T C Q C 5 W 2 Q H 5 67 J 2 100 J 5 2 33 J. W 5 eQ H 5 1 0.67 21 100 J 2 5 67 J T H 5 T C 1 2 e 5 291 K 1 2 0.67 5 882 K 5 609°C 5 1128°F e 5 1 2 T C T H T C 5 65°F 5 18.3°C 5 291 K. Q C , 0. W . Q H . 0, W 5 Q C 1 Q H . e 5 W Q H . e Carnot 5 1 2 T C T H e Carnot 5 1 2 281 K 298 K 5 0.057 5 5.7%. T H 5 25°C 5 298 K. T C 5 8°C 5 281 K T H T C e Carnot 5 1 2 T C T H . The Second Law of Thermodynamics 16-5...
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