Exercios resolvidos

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SOLUTION MANUAL SI UNIT PROBLEMS CHAPTER 2
SONNTAG • BORGNAKKE • VAN WYLEN

FUNDAMENTALS

of
Thermodynamics
Sixth Edition

CONTENT
SUBSECTION Correspondence table Concept-Study Guide Problems Properties and Units Force and Energy Specific Volume Pressure Manometers and Barometers Temperature Review Problems PROB NO. 1-22 23-26 27-37 38-43 44-57 58-76 77-80 81-86

Sonntag, Borgnakkeand van Wylen

Correspondence table CHAPTER 2 6th edition

Sonntag/Borgnakke/Wylen

The correspondence between the problem set in this sixth edition versus the problem set in the 5'th edition text. Problems that are new are marked new and those that are only slightly altered are marked as modified (mod). Study guide problems 2.1-2.22 and 2.23-2.26 are all new problems. New 27 28 29 30 31 3233 34 35 36 37 38 39 40 41 42 43 44 45 46 5th Ed. 1 new 2 new 3 new 5 6 7 9 10 12 new new new 11 13 new 18 14 New 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 5th Ed. new 16 17 new new 19 new 34 29 new 28 mod new 20 26 new 21 new new 15 new New 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 5th Ed. 24 new new 23 new 30 32 33 new 37 27 new 38 new 31 new 22 35 36 newEnglish Unit Problems New 5th Ed. SI New 5th Ed. SI 87 new 97 43E 43 88 new 11 98 new 50 89 new 12 99 new 53 90 new 19 100 45E 70 91 new 20 101 46E 45 92 new 24 102 new 82 93 39E 33 103 48E 55 94 40E 104 new 80 95 new 47 105 47E 77 96 42E 42 Design and Open ended problems 106-116 are from 5th edition problems 2.502.60

Sonntag, Borgnakke and van Wylen

Concept-Study Guide Problems
2.1 Make acontrol volume around the turbine in the steam power plant in Fig. 1.1 and list the flows of mass and energy that are there. Solution: We see hot high pressure steam flowing in at state 1 from the steam drum through a flow control (not shown). The steam leaves at a lower pressure to the condenser (heat exchanger) at state 2. A rotating shaft gives a rate of energy (power) to the electric generatorset.

1 WT 2

Sonntag, Borgnakke and van Wylen

2.2 Make a control volume around the whole power plant in Figure 1.2 and with the help of Fig. 1.1 list what flows of mass and energy are in or out and any storage of energy. Make sure you know what is inside and what is outside your chosen C.V. Solution: Boiler building Coal conveyor system Storage gypsum
cb

Smoke stack

flue gasTurbine house Dock

Coal storage

Underground Welectrical power cable District heating Cold return Hot water

Combustion air m m m

Flue gas

Storage for later m transport out: Gypsum, fly ash, slag m

Coal

Sonntag, Borgnakke and van Wylen

2.3 Make a control volume that includes the steam flow around in the main turbine loop in the nuclear propulsion system in Fig.1.3. Identify massflows (hot or cold) and energy transfers that enter or leave the C.V. Solution:
1 Hot steam from generator 1 Electric power gen.
cb

WT 3 4

Welectrical

The electrical power also leaves the C.V. to be used for lights, instruments and to charge the batteries.

2 5 Condensate to steam gen. cold

7 6 Cooling by seawater

Sonntag, Borgnakke and van Wylen

2.4 Take a control volumearound your kitchen refrigerator and indicate where the components shown in Figure 1.6 are located and show all flows of energy transfer. Solution: The valve and the cold line, the evaporator, is inside close to the inside wall and usually a small blower distributes cold air from the freezer box to the refrigerator room.
cb

Q leak

Q

.

The black grille in the back or at the bottom is thecondenser that gives heat to the room air. W

.

The compressor sits at the bottom.

Sonntag, Borgnakke and van Wylen

2.5 An electric dip heater is put into a cup of water and heats it from 20oC to 80oC. Show the energy flow(s) and storage and explain what changes. Solution: Electric power is converted in the heater element (an electric resistor) so it becomes hot and gives energy by...
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