目录
Contents
1 District Heating 1
1.1 District Heating Systems 1
1.1.1 Overview of District Heating Systems 1
1.1.2 Development of District Heating System 2
1.1.3 Industry Standard of District Heating System Pipe Network 8
1.1.4 Problems of District Heating System Pipe Network 13
1.1.5 Future Development of District Heating Systems 25
References 28
2 Basic Characteristics of Heating Pipeline Network System 31
2.1 Heating Pipeline Network 31
2.1.1 Prefabricated Insulation Pipe Structure 31
2.1.2 SoilMass 36
2.2 Long-Distance Transmission and Supply Pipe Network System LayingMethod 40
2.2.1 Laying on the Ground 41
2.2.2 Underground Laying 43
2.3 Installation of Heating Pipeline Network 47
2.3.1 Installation Components of Heating Pipeline Network 47
2.3.2 Layout of Heating Pipeline Network 50
2.3.3 Installation Method of Heating Pipelines 54
References 55
3 Basic Theory of Long Distance Pipeline 57
3.1 Basic Theory of Fluid Solid Thermal Coupling 58
3.1.1 Development of Fluid Structure Thermal Coupling Cooperation 58
3.1.2 Definition and Classification of Fluid Solid Thermal Coupling 60
3.1.3 Fluid–Solid–Thermal Coupling Calculation Theory 66
3.1.4 Research Methods for Fluid Solid Thermal Coupling 74
3.1.5 Theoretical Analysis of Multi Field Coupling 78
References 81
4 Theory of Elastoplasty and Economic Evaluation for Directly Buried Insulated Pipeline Systems 83
4.1 Development of Pipeline Elastoplasticity 83
4.2 Elastoplastic Definition and Classification of Pipeline 85
4.2.1 Elastoplastic Definition and Characteristics of Pipeline 85
4.2.2 Elastoplastic Classification of Pipelines 87
4.3 Pipeline Elastic–Plastic Calculation Theory 89
4.3.1 Calculation Theory of Elasticity 89
4.3.2 Calculation Theory of Plastic Mechanics 92
4.3.3 Definition and Classification of Pipeline Heat Loss 93
4.3.4 Theoretical Calculation of Heat Loss 94
4.4 Economic Evaluation of Pipe Network Operation 102
4.4.1 Economic Evaluation Theory 102
References 104
5 Case Study on Fluid–Solid Thermal Coupling in Heating Pipelines 107
5.1 Effects of the Temperature and Pressure Loads Coupled on Structure Stress of “L”-Type Large-Diameter Buried Pipe Network 108
5.1.1 Overview 108
5.1.2 Numerical Model 109
5.1.3 Results and Analysis 111
5.1.4 Conclusion 119
References 121
6 Effects of End to Side Displacement Load on Structure Stress and Deformation of “L”-Type Large-Diameter Buried Pipe Network 123
6.1 Overview 123
6.2 Numerical Model 124
6.3 Results and Analysis 125
6.3.1 Equivalent Stress and Strain Distribution of Pipeline Network Under Equivalent Displacement Load 126
6.3.2 Effect of Equivalent End Displacement Release on Equivalent Stress and Deformation of Pipelines 127
6.3.3 Equivalent Stress and Deformation Distribution of Pipelines Under Non-Equivalent Displacement Loads 130
6.3.4 Effect of Unequivalent End Side Displacement Release on Equivalent Stress and Deformation of Pipelines 130
6.4 Conclusions 133
References 134
7 Analysis of Fluid–Solid–Thermal Performance of L-Shaped Pipeline System 135
7.1 Overview 135
7.2 Numerical Model 136
7.3 Results and Analysis 139
7.3.1 Comparison of Experimental Parameters 139
7.3.2 Analysis of Pressure and Temperature Fields in the Fluid Region 141
7.3.3 Deformation Distribution Performances of the Pipeline Under Different Loads and Laying Conditions 142
7.3.4 Influences of Different Loads on Maximum Deformation of Elbow 146
7.3.5 Influences of Coupling Action on Maximum Deformation of an Elbow 149
7.4 Conclusions 150
References 151
8 Coupled Validity Analysis of Solid-Heat Multi-Field Model for Straight Tube Flow 153
8.1 Overview 153
8.2 Numerical Model 154
8.3 Results and Analysis 157
8.3.1 Stress and Deformation Distribution of Pressure Pipeline Along Axial Direction and Cross-Section 158
8.3.2 Stress and Deformation Distribution of Pipeline Under Separate Action of Temperature Loading and Pressure Loading 160
8.3.3 Distribution of Stress and Deformation in the Axial Direction at Critical Points of the Pipe Cross-Section Under Coupling Action 165
8.4 Conclusions 166
References 167
9 Influence of Key Structural Parameters on Total Heat Loss and Heat Transfer Between Tubes 169
9.1 Overview 169
9.2 Numerical Model 171
9.3 Results and Analysis 173
9.3.1 Influence ofKey Structural Parameters on the Total Heat Loss of the System 173
9.3.2 Influence of Key Structural Parameters on Heat Transfer Between Tubes 176
9.3.3 Influence of Dimensionless Characteristic Parameters on the Total Heat Loss of the System and Heat Transfer Between Pipes 176
9.3.4 Influence of Dimensionless Characteristic Parameters on Heat Loss Cost and Material Consumption Cost 180
9.4 Conclusions 183
Referenc
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