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RESEARCH PAPERS: Fuel Cells

Analysis of Intermediate Temperature Solid Oxide Fuel Cell Transport Processes and Performance

[+] Author and Article Information
Jinliang Yuan, Bengt Sundén

Division of Heat Transfer, Lund Institute of Technology (LTH), Box 118, 22100 Lund, Sweden

J. Heat Transfer 127(12), 1380-1390 (Mar 02, 2005) (11 pages) doi:10.1115/1.2098847 History: Received June 07, 2004; Revised March 02, 2005

A new trend in recent years is to reduce the solid oxide fuel cell (SOFC) operating temperature to an intermediate range by employing either a thin electrolyte, or new materials for the electrolyte and electrodes. In this paper, a numerical investigation is presented with focus on modeling and analysis of transport processes in planar intermediate temperature (IT, between 600 and 800°C) SOFCs. Various transport phenomena occurring in an anode duct of an ITSOFC have been analyzed by a fully three-dimensional calculation method. In addition, a general model to evaluate the stack performance has been developed for the purpose of optimal design and/or configuration based on specified electrical power or fuel supply rate.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Structure of a unit cell; (b) schematic drawing of a composite anode duct

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Figure 2

(a) Influence of grid size on fappRe and Nu; and (b) fully developed Nu variation in a parallel plate duct with Darcy number (Da=β∕h2), compared with the analytical ones from (9)

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Figure 3

ITSOFC performance (V-i curve) for gas composition of CO(28%)+CO2(17%)+H2(55%)(4) at the base condition

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Figure 4

ITSOFC stack performance at the base condition

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Figure 5

(a) Permeation Reynolds number Rep; (b) fappRe and Nu along the main flow direction

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Figure 6

Dimensionless axial velocity contours (U∕Uin) along the main flow stream of an ITSOFC anode duct

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Figure 7

Dimensionless temperature contours along the main flow stream of an ITSOFC anode duct

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Figure 8

(a) H2; and (b) H2O mass concentration distribution along the main flow direction of an ITSOFC anode duct

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Figure 9

Cross-sectional hydrogen mass concentration distribution at: (a) 12 length from the inlet; (b) the exit of ITSOFC anode duct

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Figure 10

Various contributions to hydrogen flux at the bottom wall at the base case condition

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Figure 11

Variations of hydrogen mass flux of the bottom wall at the base case condition

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