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Research Papers: Hydrogen Energy

Entropy Generation Minimization in a Tubular Solid Oxide Fuel Cell

[+] Author and Article Information
Adriano Sciacovelli

Dipartimento di Energetica, Politecnico di Torino, c.so Duca degli Abruzzi 24, 10129 Torino, Italyadriano.sciacovelli@polito.it

Vittorio Verda

Dipartimento di Energetica, Politecnico di Torino, c.so Duca degli Abruzzi 24, 10129 Torino, Italyvittorio.verda@polito.it

J. Energy Resour. Technol 132(1), 012601 (Mar 26, 2010) (11 pages) doi:10.1115/1.4001063 History: Received November 20, 2008; Revised December 22, 2009; Published March 26, 2010; Online March 26, 2010

The aim of the paper is to investigate possible design modifications in tubular solid oxide fuel cell geometry to increase its performance. The analysis of the cell performances is conducted on the basis of the entropy generation. The use of this technique makes it possible to identify the phenomena provoking the main irreversibilities, understand their causes and propose changes in the system design and operation. The different contributions to the entropy generation are analyzed in order to develop new geometries that increase the fuel cell efficiency. To achieve this purpose, a CFD model of the cell is used. The model includes energy equation, fluid dynamics in the channels and in porous media, current transfer, chemical reactions, and electrochemistry. The geometrical parameters of the fuel cell are modified to minimize the overall entropy generation.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

(a) Schematic of fuel cell module and (b) sketch of the computational domain

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Figure 13

Effect of x-scale and y-scale on entropy generation due to heat transfer

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Figure 14

Effect of x-scale and y-scale on entropy generation due to coupling between heat and mass transfer

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Figure 15

Entropy generation versus power density

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Figure 16

Global entropy generation

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Figure 17

Effect of the optimization on the power density

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Figure 2

Fuel cell cross-section (a) and possible modified configuration (b)

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Figure 3

Velocity path lines (a) inside cathode channel and velocity vectors (b) in a cross-section

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Figure 4

Distribution of hydrogen mass fraction

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Figure 5

Oxygen mass fraction

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Figure 6

Temperature distribution

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Figure 7

Viscous entropy generation on cross-section planes (a) z=20 mm, (b) z=40 mm, (c) z=60 mm, and (d) z=80 mm

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Figure 8

Entropy generation due to heat transfer on cross-section planes

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Figure 9

Entropy generation due to mass transfer on cross-section planes

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Figure 10

Entropy generation due to coupling between heat and mass transfer

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Figure 11

Bubble chart of entropy generation

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Figure 12

Effect of x-scale and y-scale on viscous entropy generation

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