목차

1. Introduction.............................................................................1
1.1. Solid Oxide Fuel Cell.................................................................1
1.2. Working Principle of SOFC.......................................................2
1.3. Flow Uniformity.........................................................................6
1.4. Biogas as a fuel in SOFCs..........................................................8
1.5. Genetic Algorithm (GA) ..........................................................10
1.5.1. Fitness ..................................................................................11
1.5.2. Selection...............................................................................12
1.5.3. Crossover .............................................................................12
1.5.4. Mutation...............................................................................13
1.6. Research motivation.................................................................13
1.7. Objectives of the study.............................................................14
2. CFD Analysis of 5 Planar-SOFC Stack Designs.................16
2.1. Model Development.................................................................17
2.1.1. Geometry and Mesh .............................................................17
2.1.2. Model Assumptions .............................................................20
2.1.3. Reactions Considered for Model..........................................20
2.1.4. Electrochemical Model ....................................................... 21
2.1.5. Governing Equations........................................................... 23
2.1.6. Stack Flow Uniformity Criteria........................................... 26
2.2. Results and Discussion............................................................ 27
2.2.1. Explanation of Experimental Results.................................. 27
2.2.2. Model Validation................................................................. 29
2.2.3. Error Analysis and Cell Efficiency ..................................... 31
2.2.4. Calculation Results for Flow Analysis Within Cells........... 32
2.2.5. Calculation Results for Flow Analysis Within Channels.... 34
2.2.6. Species, Temperature and Current Distribution .................. 38
3. Optimization of Operating Parameters of SOFC ..............43
3.1. Effect of Fuel Utilization......................................................... 43
3.2. Effect of Air Utilization........................................................... 45
3.3. Effect of Porosity..................................................................... 47
3.4. Effect of Operating Temperature............................................. 48
3.5. Optimization Through Numerical Approach........................... 50
3.5.1. Parameters to be Optimized ................................................ 50
3.5.2. Numerical Results ............................................................... 52
3.6. Optimization Through Genetic Algorithm.............................. 58
3.6.1. Curve Fitting and Equation Generation ...............................58
3.6.2. Genetic Algorithm Results...................................................67
4. Conclusions ............................................................................75
5. References ..............................................................................80