Principles of Power system by vk Mehta pdf

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Principles of Power system by Vk Mehta pdf

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Refrigerating Machine and Reversed Carnot Cycle 64
2.1 Refrigerating Machines 64
2.2 A Refrigerating Machine—The Second Law Interpretation 64
2.3 Heat Engine, Heat Pump and Refrigerating Machine 67
2.4 Best Refrigeration Cycle: The Carnot Principle 71
2.5 Vapour as a Refrigerant in Reversed Carnot Cycle 80
2.6 Gas as a Refrigerant in Reversed Carnot Cycle 82
2.7 Limitations of Reversed Carnot Cycle 84
2.8 Actual Refrigeration Systems 85
Revision Exercises 86
3. Vapour Compression System 87
3.1 Modifications in Reversed Carnot Cycle with Vapour
as a Refrigerant 87
3.2 Vapour Compression Cycle 89
3.3 Vapour Compression System Calculations 91
3.4 Ewing’s Construction 99
3.5 Standard Rating Cycle and Effect of Operating Conditions 103
3.6 Actual Vapour Compression Cycle 114
3.7 Standard Rating Cycle for Domestic Refrigerators 118
3.8 Heat Pump 121
3.9 Second Law Efficiency of Vapour Compression Cycle 122
References 123
Revision Exercises 124
4. Refrigerants 128
4.1 A Survey of Refrigerants 128
4.2 Designation of Refrigerants 129
4.3 Comparative Study of Methane Derivatives in
Use Before the Year 2000 133
4.4 Comparative Study of Ethane Derivatives in Use
Before the Year 2000 134
4.5 Refrigerants in Use after the Year 2000 135
4.6 Selection of a Refrigerant 136
4.7 Thermodynamic Requirements 137
4.8 Chemical Requirements 147
4.9 Physical Requirements 150
4.10 Ozone Depletion Potential and Global
Warming Potential of CFC Refrigerants 153
4.11 Substitutes for CFC Refrigerants 154
4.12 Substitutes for CFC 12 157
4.13 Substitutes for CFC 11 169
viii

4.14 Substitutes for HCFC 22 170
4.15 Substitutes for CFC R 502 171
4.16 Atmospheric Gases as Substitutes for CFC Refrigerants 171
4.17 Using Mixed Refrigerants 174
4.18 Binary Mixtures 174
4.19 Classification of Mixtures 180
4.20 Evaluation of Thermodynamic Properties
of R 290/R 600a Mixtures 188
4.21 Azeotropic Mixtures 191
4.22 Use of Minimum and Maximum Boiling Azeotropes 193
4.23 Non-isothermal Refrigeration 195
4.24 Refrigerant Piping and Design 201
4.25 Lubricants in Refrigeration Systems 207
4.26 Secondary Refrigerants 208
References 210
Revision Exercises 212
5. Multipressure Systems 214
5.1 Introduction 214
5.2 Multistage or Compound Compression 214
5.3 Multi-Evaporator Systems 222
5.4 Cascade Systems 226
5.5 Solid Carbon Dioxide—Dry Ice 228
5.6 Manufacture of Solid Carbon Dioxide 228
5.7 System Practices for Multi-stage Systems 233
References 234
Revision Exercises 234
6. Refrigerant Compressors 236
6.1 Types of Compressors 236
6.2 Thermodynamic Processes During Compression 239
6.3 Volumetric Efficiency of Reciprocating Compressors 242
6.4 Effect of Clearance on Work 246
6.5 Principal Dimensions of a Reciprocating Compressor 247
6.6 Performance Characteristics of Reciprocating Compressors 248
6.7 Capacity Control of Reciprocating Compressors 253
6.8 Construction Features of Reciprocating Compressors 256
6.9 Rotary Compressors 256
6.10 Screw Compressors 257
6.11 Scroll Compressors 259
6.12 Centrifugal Compressors 260
6.13 Performance Characteristics of a Centrifugal Compressor 268

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