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Design Innovation

High Power Density Solid Oxide Fuel Cells for Auxiliary Power Unit Applications

[+] Author and Article Information
Robert Draper

 Siemens Power Corporation, Pittsburgh, PA 15235

Gianfranco DiGiuseppe1

 Siemens Power Corporation, Pittsburgh, PA 15235gdigiuse@kettering.edu

1

Corresponding author. Present address: Kettering University.

J. Fuel Cell Sci. Technol 5(3), 035001 (May 22, 2008) (9 pages) doi:10.1115/1.2889013 History: Received July 19, 2005; Revised March 13, 2007; Published May 22, 2008

High power density (HPD) solid oxide fuel cells (SOFCs) possess the attributes of reduced ohmic polarization and greater active area per unit volume, relative to current state-of-the-art cylindrical SOFCs. Several variations of the basic “flattened tube” HPD geometry are being analyzed and tested. For example, the HPD10 cell enjoys a 58% gain in power density over current practice. In this variation, ten air channels are separated by nine ribs that connect the flat faces of the cell. Other cell geometries, such as the delta cell, and advanced cell materials are under consideration and have the potential for further improvement in power density. The higher power density makes the application of HPD SOFCs to compact auxiliary power units (APUs) attractive. This paper reviews geometric and performance characteristics for HPD cells and presents a conceptual design for an APU of 5kW net output.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Standard AES cylindrical SOFC

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Figure 4

Current path in a cylindrical SOFC

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Figure 5

Improved current path in a HPD SOFC

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Figure 6

Different types, cylindrical and HPD, of AES SOFCs by the APS process

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Figure 7

Different size bundles of cylindrical and HPD5 SOFCs by the APS process

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Figure 8

Cell electrical performance with 89% H2∕11%H2O and at 85% fuel utilization in terms of current density

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Figure 9

Cell electrical performance with 89% H2∕11%H2O and at 85% fuel utilization in terms of cell current

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Figure 10

Cell electrical performance with 89% H2∕11%H2O and at 85% fuel utilization in terms of current density

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Figure 11

Cell electrical performance for HPD5 cell with different electrolyte materials

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Figure 12

Lifetime plot for Test 1000

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Figure 13

HPD5 bundle electrical performance at 1000°C with 89% H2∕11%H2O and at 80% fuel utilization

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Figure 14

Conceptual schematic of Siemens 5kW APU

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Figure 15

Cutaway of Siemens 5kW APU

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