Modern Engineering Thermodynamics

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13.9 Rankine Cycle with Reheat 479 EXAMPLE 13.7 The first Rankine cycle steam turbine prime mover with reheat used in the United States was at the Crawford Avenue power station of the Commonwealth Edison Company of Chicago, Illinois, which went into operation in September 1924. The primary steam was at 700.°F, 600. psia, with reheat to 700.°F at 100. psia. The isentropic efficiencies of the first and second turbine stages and the boiler feed pump were 84.0, 80.0, and 61.0%, respectively. The condenser pressure was 1.00 psia with saturated liquid being produced at its outlet. Determine a. The Rankine cycle thermal efficiency of the plant with reheat. b. The Rankine cycle thermal efficiency of the plant without reheat (assume a turbine isentropic efficiency of 82.0% for this calculation). Solution a. Using the notation of Figure 13.27, the monitoring station data for this problem are where the following calculations have been used: Then, and Station 1 Station 2s p 1 = 600: psia p 2s = p 2 = 100: psia T 1 = 700:°F s 2s = s 1 = 1:5874 Btu/ðlbm . RÞ h 1 = 135:6 Btu/lbm x 2s = 0:9856 s 1 = 1:5874 Btu/ðlbm . RÞ h 2s = 1175:0 Btu/lbm Station 3 Station 4s p 3 = p 2s = 100: pisa p 4s = p 4 = 1:00 psia T 3 = 700:°F s 4s = s 3 = 1:8035 Btu/ðlbm . RÞ h 3 = 1379:2 Btu/lbm x 4s = 0:9054 s 3 = 1:8035 Btu/ðlbm . RÞ h 4s = 1007:7 Btu/lbm Station 5 Station 6s p 5 = 1:00 psia p 6s = p 6 = 600: psia x 5 = 0:00 s 6s = s 5 = 0:1326 Btu/ðlbm . RÞ h 5 = 69:7 Btu/lbm h 6s = 72:5 Btu/lbm s 5 = 0:1326 Btu/ðlbm . RÞ x 2s = s 2s − s f 2 = s 1 − s f 2 1:5874 − 0:4745 = = 0:9856 s fg2 s fg2 1:1291 h 2s = h f 2 + x 2s ðh fg2 Þ = 298:6 + ð0:9856Þð889:2Þ = 1175:0 Btu/lbm x 4s = s 3 − s f 4 1:8035 − 0:1326 = = 0:9054 s fg4 1:8455 h 4s = h f 4 + x 4s h fg4 = 69:7 + ð0:9054Þð1036:0Þ = 1007:7 Btu/lbm: Since v 5 = v f (1.0 psia) = 0.01614 ft 3 /lbm, Eqs. (13.16) and (13.17) can now be used to give and Then, finally, Eq. (13.15) yields h 2 = 1350:6 − ð0:840Þð1350:6 − 1175:0Þ = 1203:1 Btu/lbm h 6 = 69:7 + ð0:01614Þð600: − 1:00Þð144/778:16Þ/ð0:610Þ = 69:7 + 2:93 = 72:6 Btu=lbm ð1350:6 − 1175:0Þð0:840Þ + ð1379:2 − 1007:7Þð0:800Þ − 2:93 η T = ð1350:6 − 72:6Þ + ð1379:2 − 1203:1Þ = 0:304 = 30:4% (Continued )
480 CHAPTER 13: Vapor and Gas Power Cycles EXAMPLE 13.7 (Continued ) b. Here, we remove the reheat loop by simply eliminating the pipes with monitoring stations 2 and 3 in Figure 13.27. The power plant’s thermal efficiency becomes ð η T = h 1 − h 4s Þðη s Þ pm − ðh 6s − h 5 Þ/ ðη s h 1 − h 6 Þ pm where all the enthalpy values are the same as they were in part a except for h 4s . Here, s 4s = s 1 , and x 4s = s 1 − s f 4 = 1:5874 − 0:1326 = 0:7883 s fg4 1:8455 so h 4s = 69:7 + ð0:7883Þð1036:0Þ = 886:4 Btu/lbm Then, η T = ð1350:6 − 886:4Þð0:82Þ − 2:93 1350:6 − 72:6 = 0:296 = 29:6% Exercises 19. Determine the isentropic Rankine cycle thermal efficiency of the Crawford Avenue power plant without reheat discussed in Example 13.7b. Assume all the variables except the turbine and boiler feed pump isentropic efficiencies remain unchanged. Answer: (η T ) isentropic Rankine = 36.2%. 20. If the isentropic efficiency of the boiler feed pump in the Crawford Avenue power plant with reheat in Example 13.7(a) is increased from 61.0% to 85.0%, determine the power plant’s new Rankine cycle thermal efficiency. Assume all the other variables remain unchanged. Answer: (η T ) Rankine = 30.4% (there is no change in (η T ) Rankine to three significant figures). 21. If the reheat pressure in the Crawford Avenue power plant with reheat in Example 13.7a is decreased from 100. psia to 80.0 psia, determine the power plant’s new Rankine cycle thermal efficiency. Assume all the other variables remain unchanged. Answer: (η T ) Rankine = 30.4% (there is no change in (η T ) Rankine to three significant figures). Note that the interstage reheating used in Example 13.7 increases the Rankine cycle thermal efficiency by only 0.8%. However, it has the much more important effect of reducing the moisture content at the turbine exit. Wet steam with a moisture content of more than 8 to 10% can produce serious blade erosion problems in the low-pressure region of a turbine. The effect of reheating in this example keeps the exit moisture level within this range, whereas without reheating, part b of the example shows that the exit moisture level would be (1 – 0.7883)(100) = 21.2%, which is much too high. 13.10 MODERN STEAM POWER PLANTS In the years since the 1930s, the advancements in boiler technology have been as dramatic as those in turbine technology. Turbine inlet pressures and temperatures continued to increase over the years, mainly due to significant improvements in high-temperature strength properties of various metal alloys. The simultaneous use of superheat, reheat, and regeneration, along with improved turbine isentropic and mechanical efficiencies at higher turbine inlet temperatures and pressures, allowed actual operating power station thermal efficiencies to reach percentages in the low 40s by the 1980s (see Figure 13.9). In the 1930s, the turbine-generator unit output reached 200 MW, and by the 2000s, it had surpassed 2000 MW. Figure 13.28 shows the 2800 MW combined cycle gas turbine (CCGT) power plant built in Chiba, Japan.
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Modern Engineering Thermodynamics
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Modern Engineering Thermodynamics R
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Dedication WHAT IS AN ENGINEER AND
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Contents PREFACE . . . . . . . . .
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Contents ix 7.6 Heat Engines Runnin
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Contents xi 14.13 Air Standard Gas
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Preface TEXT OBJECTIVES This textbo
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Preface xv Step 5. Write down the b
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Acknowledgments I wish to acknowled
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Resources That Accompany This Book
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List of Symbols A a B COP CR c c p
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Prologue PARIS FRANCE, 10:35 AM, AU
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CHAPTER 1 The Beginning CONTENTS 1.
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1.2 Why Is Thermodynamics Important
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1.3 Getting Answers: A Basic Proble
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1.5 How Do We Measure Things? 7 bei
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1.6 Temperature Units 9 THE DEVELOP
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1.7 Classical Mechanical and Electr
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1.7 Classical Mechanical and Electr
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1.9 Modern Units Systems 15 where M
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1.10 Significant Figures 17 CRITICA
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1.10 Significant Figures 19 WHAT AB
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1.11 Potential and Kinetic Energies
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1.11 Potential and Kinetic Energies
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Summary 25 FIGURE 1.19 Case study 1
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Problems 27 Problems (* indicates p
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Problems 29 14. Determine the mass
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Problems 31 49. Using the CGS units
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CHAPTER 2 Thermodynamic Concepts CO
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2.3 Phases of Matter 35 System boun
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2.4 System States and Thermodynamic
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2.6 Thermodynamic Processes 39 WHAT
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2.7 Pressure and Temperature Scales
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2.9 The Continuum Hypothesis 43 Sur
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2.10 The Balance Concept 45 Solutio
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2.11 The Conservation Concept 47 or
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2.11 The Conservation Concept 49 Th
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Summary 51 change in the mass of X
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Problems 53 Problems (* indicates p
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Problems 55 and Death rate = α 2 +
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CHAPTER 3 Thermodynamic Properties
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3.3 Fun with Mathematics 59 CRITICA
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3.4 Some Exciting New Thermodynamic
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3.6 Enthalpy 63 WHO WAS AMALIE EMMY
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3.7 Phase Diagrams 65 WHO WAS EMMY
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Pressure Vapor 3.7 Phase Diagrams 6
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3.7 Phase Diagrams 69 WHAT IS A “
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3.7 Phase Diagrams 71 considerable
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3.8 Quality 73 10 5 300 C Critical
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3.8 Quality 75 Although Eq. (3.26)
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3.9 Thermodynamic Equations of Stat
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3.10 Thermodynamic Tables 85 Critic
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3.12 Thermodynamic Charts 87 vð100
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3.13 Thermodynamic Property Softwar
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Summary 91 and e = E/m = u + V2 2g
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Problems 93 c. For a saturated mixt
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Problems 95 specific enthalpy of sa
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Problems 97 Table 3.23 Problem 65 M
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CHAPTER 4 The First Law of Thermody
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4.3 The First Law of Thermodynamics
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4.3 The First Law of Thermodynamics
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4.4 Energy Transport Mechanisms 105
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4.5 Point and Path Functions 107 4.
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4.6 Mechanical Work Modes of Energy
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4.7 Nonmechanical Work Modes of Ene
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4.9 Work Efficiency 125 In the case
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4.12 Heat Modes of Energy Transport
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4.13 Heat Transfer Modes 129 Table
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4.14 A Thermodynamic Problem Solvin
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4.14 A Thermodynamic Problem Solvin
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4.15 How to Write a Thermodynamics
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4.15 How to Write a Thermodynamics
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Summary 139 The general open system
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Problems 141 11.* Determine the hea
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Problems 143 where K = 0.810 lbf. D
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Problems 145 Table 4.12 Problem 67
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CHAPTER 5 First Law Closed System A
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5.2 Sealed, Rigid Containers 149 In
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5.4 Power Plants 151 Step 7. Calcul
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5.5 Incompressible Liquids 153 The
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1Q 2 − 1 W 2 = mðu 2 − u 1 Þ
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5.8 Closed System Unsteady State Pr
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5.9 The Explosive Energy of Pressur
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Problems 161 Problems (* indicates
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Problems 163 31. A thermoelectric g
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Problems 165 where v, T, and r are
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CHAPTER 6 First Law Open System App
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6.2 Mass Flow Energy Transport 169
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6.3 Conservation of Energy and Cons
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6.4 Flow Stream Specific Kinetic an
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6.5 Nozzles and Diffusers 175 m (a)
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6.5 Nozzles and Diffusers 177 We ar
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6.6 Throttling Devices 179 These as
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6.6 Throttling Devices 181 For an i
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6.7 Throttling Calorimeter 183 The
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6.8 Heat Exchangers 185 Convective
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6.9 Shaft Work Machines 187 6.9 SHA
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6.9 Shaft Work Machines 189 1 Basem
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6.10 Open System Unsteady State Pro
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Problems 197 we have _m R / _m D =
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Problems 201 32.* A commercial slid
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Summary 203 59. Incompressible liqu
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CHAPTER 7 Second Law of Thermodynam
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7.3 The Second Law of Thermodynamic
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7.4 Carnot’s Heat Engine and the
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7.4 Carnot’s Heat Engine and the
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7.5 The Absolute Temperature Scale
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7.5 The Absolute Temperature Scale
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7.6 Heat Engines Running Backward 2
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7.7 Clausius’s Definition of Entr
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7.8 Numerical Values for Entropy 22
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7.10 Differential Entropy Balance 2
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7.11 Heat Transport of Entropy 229
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7.13 Entropy Production Mechanisms
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7.14 Heat Transfer Production of En
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7.15 Work Mode Production of Entrop
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7.15 Work Mode Production of Entrop
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7.16 Phase Change Entropy Productio
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Summary 241 ■ Indirect method inv
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Problems 243 amount of work W irr i
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Problems 245 a. If the heat pump is
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Problems 247 51. Develop a program
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CHAPTER 8 Second Law Closed System
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8.2 Systems Undergoing Reversible P
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8.3 Systems Undergoing Irreversible
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8.4 Diffusional Mixing 271 Exercise
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Summary 273 Note that this example
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Problems 275 15. A 20.0 ft 3 tank c
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Problems 277 46. a. Determine a for
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CHAPTER 9 Second Law Open System Ap
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9.4 Open System Entropy Balance Equ
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9.4 Open System Entropy Balance Equ
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9.5 Nozzles, Diffusers, and Throttl
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9.5 Nozzles, Diffusers, and Throttl
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9.6 Heat Exchangers 289 Exercises 1
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9.6 Heat Exchangers 291 (T H ) (T H
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9.7 Mixing 293 Now, _m air is given
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9.7 Mixing 295 Critical value of y,
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9.9 Unsteady State Processes in Ope
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Problems 309 Multiplying this equat
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Problems 311 entropy production rat
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Problems 313 heat is added to the b
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Problems 315 55.* Determine the max
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Problems 317 The cavitation process
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CHAPTER 10 Availability Analysis CO
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10.3 What Are Conservative Forces?
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10.6 Availability 323 WHAT IS A SYS
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10.6 Availability 325 and the total
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10.7 Closed System Availability Bal
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10.7 Closed System Availability Bal
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10.8 Flow Availability 331 EXAMPLE
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s − s 0 = c ln T T 0 10.8 Flow Av
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10.10 Modified Availability Rate Ba
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10.10 Modified Availability Rate Ba
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10.11 Energy Efficiency Based on th
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Summary 351 In this problem, we hav
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Summary 353 7. The general open sys
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Problems 355 12.5 Btu/hr·ft ·R. I
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Problems 357 flow rate of 15.0 lbm/
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Problems 359 85. Create a specific
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CHAPTER 11 More Thermodynamic Relat
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11.2 Two New Properties: Helmholtz
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11.2 Two New Properties: Helmholtz
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11.4 Maxwell Equations 367 11.4 MAX
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11.4 Maxwell Equations 369 then,
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11.5 The Clapeyron Equation 371 and
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11.6 Determining u, h, and s from p
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11.7 Constructing Tables and Charts
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11.8 Thermodynamic Charts 381 so th
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11.9 Gas Tables 383 where p r is th
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11.10 Compressibility Factor and Ge
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11.11 Is Steam Ever an Ideal Gas? 3
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Summary 399 equation, and a series
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Problems 401 20.* Estimate h fg for
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Problems 403 Design Problems The fo
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CHAPTER 12 Mixtures of Gases and Va
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12.2 Thermodynamic Properties of Ga
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12.3 Mixtures of Ideal Gases 413 Th
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12.3 Mixtures of Ideal Gases 415 Co
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12.4 Psychrometrics 417 Finally, th
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12.4 Psychrometrics 419 EXAMPLE 12.
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12.6 The Sling Psychrometer 421 The
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12.6 The Sling Psychrometer 423 p w
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12.7 Air Conditioning 425 WHAT ENVI
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12.8 Psychrometric Enthalpies 427 E
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Page 464 and 465: Summary 439 Last, we combine Dalton
Page 466 and 467: Problems 441 Problems (* indicates
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Page 488 and 489: 13.5 Operating Efficiencies 463 b.
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Page 518 and 519: 13.15 Lenoir Cycle 493 Exercises 28
Page 520 and 521: 13.16 Brayton Cycle 495 Solution Us
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Page 552 and 553: Problems 527 7. The thermal efficie
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efficiency increase if the condense
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Problems 531 horsepower hour. Assum
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Problems 533 72. Determine the valu
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CHAPTER 14 Vapor and Gas Refrigerat
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14.3 Carnot Refrigeration Cycle 537
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14.4 In the Beginning There Was Ice
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14.4 In the Beginning There Was Ice
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14.5 Vapor-Compression Refrigeratio
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14.5 Vapor-Compression Refrigeratio
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14.6 Refrigerants 547 T 3 2s 2 p 3
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14.7 Refrigerant Numbers 549 14.7 R
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14.7 Refrigerant Numbers 551 R-110
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14.8 CFCs and the Ozone Layer 553 H
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14.9 Cascade and Multistage Vapor-C
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14.10 Absorption Refrigeration 561
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14.11 Commercial and Household Refr
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14.14 Reversed Brayton Cycle Refrig
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14.14 Reversed Brayton Cycle Refrig
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14.15 Reversed Stirling Cycle Refri
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14.16 Miscellaneous Refrigeration T
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14.16 Miscellaneous Refrigeration T
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14.18 Second Law Analysis of Refrig
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14.18 Second Law Analysis of Refrig
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2. The coefficient of performance o
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Problems 585 13.* A refrigeration u
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Problems 587 Loop B Station 1B Stat
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Problems 589 under these conditions
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CHAPTER 15 Chemical Thermodynamics
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15.2 Stoichiometric Equations 593 1
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15.2 Stoichiometric Equations 595 C
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15.3 Organic Fuels 597 ANSWERS SOME
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15.4 Fuel Modeling 599 Hydrocarbon
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15.4 Fuel Modeling 601 equation, si
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15.5 Standard Reference State 603 I
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15.6 Heat of Formation 605 and H 2
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15.7 Heat of Reaction 607 EXAMPLE 1
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15.7 Heat of Reaction 609 CRITICAL
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15.7 Heat of Reaction 611 Then, h P
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15.8 Adiabatic Flame Temperature 61
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15.9 Maximum Explosion Pressure 619
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15.10 Entropy Production in Chemica
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15.10 Entropy Production in Chemica
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15.11 Entropy of Formation and Gibb
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15.12 Chemical Equilibrium and Diss
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H 2 O !ð1 − yÞH 2 O + yðv H2
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15.14 The van’t Hoff Equation 635
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15.15 Fuel Cells 637 Anode Electrol
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15.15 Fuel Cells 639 The maximum po
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15.16 Chemical Availability 641 and
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ðn i /n fuel Þðc pi Þ E system
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Problems 645 where j = 4n + m kgmol
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Problems 647 c. The percent excess
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Problems 649 77. Determine the mola
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CHAPTER 16 Compressible Fluid Flow
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16.3 Isentropic Stagnation Properti
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16.4 The Mach Number 655 Note that
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16.4 The Mach Number 657 Table 16.1
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16.4 The Mach Number 659 Since for
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16.5 Converging-Diverging Flows 661
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16.5 Converging-Diverging Flows 663
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16.6 Choked Flow 665 T a a p a = co
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16.6 Choked Flow 667 Exercises 16.
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16.7 Reynolds Transport Theorem 669
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16.7 Reynolds Transport Theorem 671
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16.8 Linear Momentum Rate Balance 6
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16.9 Shock Waves 675 16.9 SHOCK WAV
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16.9 Shock Waves 677 and, for an id
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16.9 Shock Waves 679 6 5 4 S P /(m
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16.10 Nozzle and Diffuser Efficienc
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16.10 Nozzle and Diffuser Efficienc
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Summary 685 Since for a diffuser, M
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43. 0.800 lbm/s of air passes throu
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Problems 691 A plot of this functio
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CHAPTER 17 Thermodynamics of Biolog
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17.3 Thermodynamics of Biological C
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17.3 Thermodynamics of Biological C
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17.4 Energy Conversion Efficiency o
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17.4 Energy Conversion Efficiency o
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17.5 Metabolism 703 Table 17.3 Brea
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17.6 Thermodynamics of Nutrition an
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17.7 Limits to Biological Growth 71
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17.7 Limits to Biological Growth 71
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17.8 Locomotion Transport Number 71
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17.9 Thermodynamics of Aging and De
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17.9 Thermodynamics of Aging and De
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1/3 V most efficient = P o ρAC D S
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Problems 723 a. If the monster cons
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Problems 725 the officer asks Paul
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CHAPTER 18 Introduction to Statisti
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18.3 Kinetic Theory of Gases 729 3.
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U trans = 3 2 NkT (Continued ) 18.3
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18.4 Intermolecular Collisions 733
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18.5 Molecular Velocity Distributio
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18.5 Molecular Velocity Distributio
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18.6 Equipartition of Energy 739 We
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18.7 Introduction to Mathematical P
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18.8 Quantum Statistical Thermodyna
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18.9 Three Classical Quantum Statis
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18.11 Monatomic Maxwell-Boltzmann G
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18.12 Diatomic Maxwell-Boltzmann Ga
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18.12 Diatomic Maxwell-Boltzmann Ga
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18.13 Polyatomic Maxwell-Boltzmann
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Summary 759 In this chapter, we sum
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Problems 761 4. Find the temperatur
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CHAPTER 19 Introduction to Coupled
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19.3 Linear Phenomenological Equati
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19.4 Thermoelectric Coupling 767 Eq
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19.4 Thermoelectric Coupling 769 Th
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19.4 Thermoelectric Coupling 771 wh
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19.4 Thermoelectric Coupling 773 Th
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19.4 Thermoelectric Coupling 775 b.
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19.5 Thermomechanical Coupling 777
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water), it seems reasonable that li
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Problems 785 b. For a Knudson gas,
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Appendix A: Physical Constants and
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Appendix B: Greek and Latin Origins
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Appendix B 791 Table B.4 Plural End
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Index Page numbers followed by f in
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Index 795 E e (specific energy), 10
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Index 797 Isobaric coefficient of v
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Index 799 Ranque, Georges Joseph, 3
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Index 801 William III, King of Engl
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Modern Engineering Thermodynamics

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