Numerical Analysis of Temperature and Current Density Distribution of a Planar Solid Oxide Fuel Cell Unit with Nonuniform Inlet Flow

2007 ◽  
Vol 51 (10) ◽  
pp. 941-957 ◽  
Author(s):  
Ping Yuan ◽  
Syu-Fang Liu
Keyword(s):  
Fuel Cell ◽  
Numerical Analysis ◽  
Solid Oxide Fuel Cell ◽  
Density Distribution ◽  
Current Density ◽  
Current Density Distribution ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Inlet Flow

A numerical analysis of unsteady transport phenomena in a Direct Internal Reforming Solid Oxide Fuel Cell

2019 ◽  
Vol 131 ◽  
pp. 1032-1051 ◽  
Author(s):  
Maciej Chalusiak ◽  
Michal Wrobel ◽  
Marcin Mozdzierz ◽  
Katarzyna Berent ◽  
Janusz S. Szmyd ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Numerical Analysis ◽  
Solid Oxide Fuel Cell ◽  
Transport Phenomena ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Internal Reforming ◽  
Direct Internal Reforming

Performance Metrics for Solid Oxide Fuel Cell Cross-Section Design

2009 ◽  
Author(s):  
George J. Nelson ◽  
Comas Haynes ◽  
William Wepfer
Keyword(s):  
Fuel Cell ◽  
Partial Pressure ◽  
Solid Oxide Fuel Cell ◽  
Correction Factor ◽  
Current Density ◽  
Performance Metrics ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Pressure Distributions ◽  
Button Cell

Analytical models have been developed to describe the partial pressure distributions of reactants within solid oxide fuel cell (SOFC) electrodes and introduce the concept of a reactant depletion current density. These existing analytical expressions for two-dimensional reactant partial pressure distributions and the reactant depletion current density are presented in non-dimensional form. Performance metrics for SOFC electrodes are developed including a correction factor that can be applied to button-cell predictions of pressure distribution and two forms of dimensionless reactant depletion current density. Performance predictions based on these metrics are compared to numerical predictions of partial pressure and depletion current density based on a finite element solution of the dusty-gas model (DGM) within SOFC electrodes. It is shown that the pressure correction factor developed provides a reasonable prediction of interconnect geometry effects. Thus, it is presented as a modeling tool that can be applied to translate component level fidelity to cell and stack level models. The depletion current density metrics developed are used to present basic design maps for SOFC unit cell cross-sections. These dimensionless forms of the depletion current density quantify the influence of sheet resistance effects on reactant depletion and can predict the deviation from the limiting current behavior predicted using a button-cell model.

Modeling, parametric analysis and optimization of an anode-supported planar solid oxide fuel cell

2015 ◽  
Vol 229 (17) ◽  
pp. 3125-3140 ◽  
Author(s):  
Mehdi Borji ◽  
Kazem Atashkari ◽  
Nader Nariman-zadeh ◽  
Mehdi Masoumpour
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Temperature Difference ◽  
Current Density ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Multi Objective Optimization ◽  
Average Current Density ◽  
Multi Objective ◽  
Average Current

Solid oxide fuel cell is a promising tool for distributed power generation systems. This type of power system will experience different conditions during its operating life. The present study aims to simulate mathematically a direct internal reforming planar type anode supported solid oxide fuel cell considering mass and energy conservation equations along with a complete electrochemical model. Two main reactions, namely water–gas shift reaction and methane steam reforming reaction, are considered as two dominant reactions occurring in a fuel cell. Such a model may be employed to examine the effect of different operating conditions on main solid oxide fuel cell parameters, such as temperature gradients, power, and efficiency. Furthermore, using such mathematical model, a multi-objective optimization procedure can be applied to determine maximum cell efficiency and output power under constraints such as the allowable temperature difference and limited operating potential. The selected design variables are air ratio, fuel utilization, average current density, steam to carbon ratio, and pre-reforming rate of methane. It has been revealed that any increase in pre-reforming rate of methane and steam to carbon ratio of the entering fuel will lead to efficiency penalty and more uniform temperature distribution along the cell. In addition, the more average current density increases, the less electric efficiency is achieved, and on the other hand, the more temperature difference along the cell is seen. Besides, it is shown that some interesting and important relationships as useful optimal design principles involved in the performance of solid oxide fuel cells can be discovered by Pareto based multi-objective optimization of the mathematically obtained model representing their electric performance. Such important optimal principles would not have been obtained without the use of both mathematical modeling and the Pareto optimization approach.

Optimization of the Anode Current Collector Layer Thickness for the Cathode-Supported Solid Oxide Fuel Cell

2013 ◽  
Vol 712-715 ◽  
pp. 1325-1329 ◽  
Author(s):  
Wei Kong ◽  
Shi Chuan Su ◽  
Xiang Gao ◽  
Dong Hui Zhang ◽  
Zi Dong Yu
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Layer Thickness ◽  
Current Density ◽  
High Performance ◽  
Current Collector ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Anode Current ◽  
Output Current

The influence of anode current collector layer (ACCL) thickness is studied for different ACCL porosity and different pitch width. The results shows conclusively that the output current density depends strongly on the ACCL thickness and a suitable choice of the ACCL thickness is very important for the high performance of a SOFC stack. Furthermore, the optimal ACCL thickness is found to be dependent linearly on the pitch width and the parameters for the linearity are given.

Experimental and numerical analysis of a radial flow solid oxide fuel cell

2007 ◽  
Vol 32 (17) ◽  
pp. 4559-4574 ◽  
Author(s):  
L ANDREASSI ◽  
G RUBEO ◽  
S UBERTINI ◽  
P LUNGHI ◽  
R BOVE
Keyword(s):  
Fuel Cell ◽  
Numerical Analysis ◽  
Solid Oxide Fuel Cell ◽  
Radial Flow ◽  
Solid Oxide ◽  
Oxide Fuel
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