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Research Papers: Hydrogen Energy

Thermoelectric Model of a Tubular SOFC for Dynamic Simulation

[+] Author and Article Information
Wei Jiang

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

Ruixian Fang

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

Roger A. Dougal

Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208

Jamil A. Khan

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

J. Energy Resour. Technol 130(2), 022601 (May 16, 2008) (10 pages) doi:10.1115/1.2906114 History: Received April 14, 2006; Revised January 30, 2007; Published May 16, 2008

A one-dimensional transient model of a tubular solid oxide fuel cell stack is proposed in this paper. The model developed in the virtual test bed (VTB ) computational environment is capable of dynamic system simulation. This model is based on the electrochemical and thermal modeling, accounting for the voltage losses and temperature dynamics. The single cell is discretized using a finite volume method where all the governing equations are solved for each finite volume. The temperature, the current density, and the gas concentration distribution along the axial direction of the cell are presented. The dynamic behavior of electrical characteristics and temperature under the variable load is simulated and analyzed. For easy implementation in the VTB platform, the nonlinear governing equations are discretized in resistive companion form. The developed model is validated with experimental results and can be used for dynamic performance evaluation and design optimization of the cell under variable operating conditions and geometric condition.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

SOFC stack model icon in VTB

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Figure 2

Tubular SOFC configuration

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Figure 3

Heat transfer assumption and element dividing

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Figure 4

Control volume defining for one element

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Figure 5

Gas control volume

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Figure 6

Comparison between simulation results and experimental data

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Figure 7

Cell voltage versus current density under temperatures

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Figure 8

Power density versus current density under temperatures

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Figure 9

Temperature distribution along the cell length

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Figure 10

Current density distribution along the cell length

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Figure 11

Heat flow distribution along the cell length

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Figure 12

Gas concentration distribution along the cell length

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Figure 13

Start-up characteristic of SOFC

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Figure 14

The effect of load resistance step decrease 10%; (a) power (W) response due to the load resistance step decrease, (b) voltage (V) response due to the load resistance step decrease, (c) H2 flow rate (mol/s) due to the load resistance step decrease, and (d) temperature (K) response due to the load resistance step decrease

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Figure 15

The effect of air flow rate step decrease 20%; (a) power (W) response due to the air flow rate step decrease, (b) voltage (V) response due to the air flow rate step decrease, (c) H2 flow rate (mol/s) due to the air flow rate step decrease, and (d) temperature (K) response due to the air flow rate step decrease

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