A Thermochemical Heat Storage System for Households (eBook)

Combined Investigations of Thermal Transfers Coupled to Chemical Reactions

Armand Fopah Lele (Autor)

eBook Download: PDF

2016 | 1st ed. 2016
XXIII, 202 Seiten
Springer International Publishing (Verlag)
978-3-319-41228-3 (ISBN)

Infos

The book offers a comprehensive report on the design and optimization of a thermochemical heat storage system for use in buildings. It combines theoretical and experimental work, with a special emphasis on model-based methods. It describes the numerical modeling of the heat exchanger, which allows recovery of about two thirds of the waste heat from both solar and thermal energy. The book also provides readers with a snapshot of current research on thermochemical storage systems, and an in-depth review of the most important concepts and methods in thermal management modeling. It represents a valuable resource for students, engineers and researchers interested in thermal energy storage processes, as well as for those dealing with modeling and 3D simulations in the field of energy and process engineering.

Inhalt

Supervisor’s Foreword 7
Parts of this thesis have been published in the following documents: 9
Journals 9
International Conferences and Workshops 9
Acknowledgements 11
Contents 13
About the Author 16
Nomenclature 17
Abbreviations 21
1 General Introduction 22
1.1 Evolution of Thermochemical Heat Storage Systems 23
1.2 Emergence of Thermal Issues 27
1.3 Motivation of This Thesis 28
References 32
2 State-of-Art of Thermochemical Heat Storage Systems 35
2.1 Short Review of Thermal Energy Storage System with Cogeneration System 35
2.2 Review of Thermochemical Heat Storage Systems 39
2.2.1 Absorption Systems 49
2.2.2 Adsorption Systems 51
2.2.3 Thermochemical Systems 54
2.3 Thermal Management and Chemical Reaction in Heat Storage Systems 63
2.3.1 Heat Transfer in the Material/Reactive Bed Process 64
2.3.2 Mass Transfer in the Material/Reactive Bed Process 65
2.3.3 Reaction/Sorption Kinetics 66
2.4 Conclusion 68
References 69
3 Thermal Management Modeling in Thermo-Chemical Heat Storage Systems 79
3.1 Different Types of Chemical Reactors 79
3.2 Storage System Description 81
3.3 Heat Exchanger Investigations 84
3.3.1 Numerical Design and Modeling 85
3.3.2 Numerical Investigation Results 88
3.4 Kinetics Modeling 91
3.5 Heat and Mass Transfer Modeling 94
3.5.1 Hypothesis and Assumptions 94
3.5.2 Geometry Design 95
3.5.3 Mathematical Modeling 97
3.5.3.1 Dehydration Phase (Storage of Heat) 97
Mass Balance and Mass Transfer 97
Flow Regime in the Bed 98
Energy Balance 99
Boundaries and Initial Conditions 100
3.5.3.2 Hydration Phase (Release of Heat) 100
Mass Balance and Mass Transfer 101
Energy Balance 102
Boundaries and Initial Conditions 103
3.5.3.3 Reaction Front Model 103
Model Hypothesis 104
Model Equations 104
3.6 Comsol Multiphysics and Meshing 107
3.6.1 Reacting Flow in Porous Media (RFDS) 107
3.6.2 Heat Transfer in Porous Media (HT) 108
3.6.3 Non-isothermal Flow (NITF) 109
3.6.4 Meshing 109
3.7 Conclusion 110
References 111
4 Characterization of Thermal Transfers and Chemical Kinetics 115
4.1 Heat Transfer Characterization (Thermal Conductivity and Specific Heat Capacity) 115
4.1.1 Experimental Methods 117
4.1.1.1 The Differential Scanning Calorimeter (DSC) 118
4.1.1.2 The Guarded Hot Cartridge (GHC) 122
4.1.1.3 Specific Heat Capacity 125
4.2 Mass Transfer Characterization (Permeability) 127
4.2.1 Experimental Methods 128
4.2.1.1 Description of the Experimental Bench 129
4.3 Chemical Kinetics Analysis (Sorption and Reaction Rate) 131
4.4 Material Preparation 133
4.5 Results, Analysis and Discussion 134
4.5.1 Thermal Conductivity Results 134
4.5.1.1 Experimental Validation 135
4.5.1.2 Experimental Results and Discussion 136
4.5.2 Heat Capacity Results 142
4.5.3 Permeability Results 142
4.5.4 Chemical Kinetics Results 146
4.6 Conclusion 148
References 150
5 Performance Analysis of the Thermochemical Heat Storage System 154
5.1 General Analysis 154
5.2 Numerical Investigations 155
5.2.1 Optimal Parameters Evaluation 156
5.2.2 Kinetics Analysis 158
5.2.3 Heat and Mass Transfer Results 161
5.2.3.1 Cooling Effect on Bed Temperature 166
5.2.4 Thermal Power and Efficiency 167
5.3 Experimental Investigations 171
5.3.1 Reactor Concept 171
5.3.2 Test Bench for the Lab-Scale Experiment 172
5.3.2.1 The Heat Exchanger Montage 173
5.3.2.2 The Measurement Elements 173
5.3.3 Experimental Methodology 175
5.4 Experimental Results 177
5.4.1 Cycle (Dehydration/Hydration) Test Number 4 Results 178
5.4.2 The Global Cycle (Dehydration/Hydration) Test Results 183
5.5 Comparison Analysis Between Experimental and Numerical Results 186
5.5.1 Model Validation and Discussion 186
5.6 Conclusion 190
References 191
6 Conclusion and Guidelines 193
References 197
Appendix 199

Produkt-Details

• Erscheint lt. Verlag: 9.7.2016
• Reihe/Serie: Springer Theses
• Reihe/Serie: Springer Theses
• Zusatzinfo: XXIII, 202 p. 74 illus., 63 illus. in color.
• Verlagsort: Cham
• Sprache: englisch
• Themenwelt: Mathematik / Informatik ► Mathematik ► Wahrscheinlichkeit / Kombinatorik
• Themenwelt: Naturwissenschaften ► Chemie
• Themenwelt: Technik ► Elektrotechnik / Energietechnik
• Schlagworte: 3D Models of Chemical Reactions • chemical kinetics • Combined Heat and Power • Coupled Heat and Mass Transfer with Chemical Reactions • Fourier Law of Heat Conduction • Heat Exchanger Modeling • Heat Storage Systems • low carbon energy • Permeability Measurement • Salt Hydrates • Thermal Analysis • Thermal Battery • Thermal Conductivity Measurement • Thermal Management Modeling • Thermochemical Heat Storage • Thermochemical Sorption Heat Storage • Waste heat recovery
• ISBN-10: 3-319-41228-0 / 3319412280
• ISBN-13: 978-3-319-41228-3 / 9783319412283