ch07 - SOLUTION MANUAL SI UNIT PROBLEMS CHAPTER 7...

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Unformatted text preview: SOLUTION MANUAL SI UNIT PROBLEMS CHAPTER 7 FUNDAMENTALS of Thermodynamics Sixth Edition SONNTAG • BORGNAKKE • VAN WYLEN Sonntag, Borgnakke and van Wylen CONTENT CHAPTER 7 SUBSECTION PROB NO. Correspondence table Concept-Study guide problems 1-17 Heat engines and refrigerators 18-32 Second law and processes 33-39 Carnot cycles and absolute temperature 40-66 Finite ∆ T heat transfer 67-76 Ideal gas Carnot cycles 77-79 Review Problems 80-91 Sonntag, Borgnakke and van Wylen CHAPTER 7. 6 th edition Sonntag/Borgnakke/Wylen This problem set compared to the fifth edition chapter 7 set. Study guide problems 7.1-7.17 are all new New 5th New 5th New 5th 18 new 43 new 68 40 19 new 44 8 69 28 20 1 45 21 70 new 21 2 46 11 71 50 22 new 47 12 72 29 23 new 48 15 73 31 24 new 49 13 74 19 25 new 50 17 75 20 26 9 mod 51 23 76 48 27 16 mod 52 18 77 52 28 new 53 44 78 new 29 new 54 35 79 51 mod 30 new 55 36 80 14 mod 31 15 mod 56 25 81 30 32 41 mod 57 32 82 new 33 3 58 new 83 10 34 4 59 24 84 33 35 new 60 26 85 27 36 5 61 22 86 34 37 new 62 43 87 46 38 new 63 45 88 47 39 new 64 new 89 37 40 new 65 38 90 42 41 new 66 39 mod 91 49 42 7 67 new The English unit problem set compared to the fifth edition chapter 7 set and the current chapter 7 SI problem set. New 5th SI New 5th SI New 5th SI 92 new 2 101 55 40 110 70 63 93 new 3 102 56 44 111 59 80 94 new 5 103 58 47 112 61 75 95 new 7 104 60 48 113 66 73 96 new 15 105 63 51 114 62 61 97 54 20 106 64 60 115 67 84 98 new 22 107 65 72 116 71 87 99 new 30 108 68 - 117 72 91 100 57 26 109 69 62 118 73 79mod Sonntag, Borgnakke and van Wylen Concept-Study Guide Problems 7.1 Electrical appliances (TV, stereo) use electric power as input. What happens to the power? Are those heat engines? What does the second law say about those devices? Most electric appliances such as TV, VCR, stereo and clocks dissipate power in electrical circuits into internal energy (they get warm) some power goes into light and some power into mechanical energy. The light is absorbed by the room walls, furniture etc. and the mechanical energy is dissipated by friction so all the power eventually ends up as internal energy in the room mass of air and other substances. These are not heat engines, just the opposite happens, namely electrical power is turned into internal energy and redistributed by heat transfer. These are irreversible processes. 7.2 A gasoline engine produces 20 hp using 35 kW of heat transfer from burning fuel. What is its thermal efficiency and how much power is rejected to the ambient? Conversion Table A.1: 20 hp = 20 × 0.7457 kW = 14.91 kW Efficiency: η TH = W . out /Q . H = 14.91 35 = 0.43 Energy equation: Q . L = Q . H- W . out = 35 – 14.91 = 20.1 kW Q ....
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ch07 - SOLUTION MANUAL SI UNIT PROBLEMS CHAPTER 7...

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