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Research Papers

The Use of a High Temperature Wind Tunnel for MT-SOFC Testing—Part I: Detailed Experimental Temperature Measurement of an MT-SOFC Using an Avant-Garde High Temperature Wind Tunnel and Various Measurement Techniques

[+] Author and Article Information
V. Lawlor1

Department of Eco-Energy, Upper Austria University of Applied Science, A-4600 Wels, Austria; Department of Manufacturing and Mechanical Engineering, Dublin City University, Dublin 9, Irelandvlawlor@gmail.com

G. Zauner, C. Hochenauer, S. Griesser

Department of Eco-Energy, Upper Austria University of Applied Science, A-4600 Wels, Austria

A. Mariani, S. Cordiner

Dipartimento di Ingegneria Meccanica, Università di Roma Tor Vergata, 00133 Rome, Italy

J. G. Carton, A. G. Olabi

Department of Manufacturing and Mechanical Engineering, Dublin City University, Dublin 9, Ireland

K. Klein, S. Kuehn

 eZelleron GmbH, Collenbusch Strasse. 22, 01324 Dresden, Germany

D. Meissner

Department of Eco-Energy, Upper Austria University of Applied Science, A-4600 Wels, Austria; Tallinn Technical University, Ehitajate tee 5, Tallinn 19086, Estonia

G. Buchinger

Department of Eco-Energy, Upper Austria University of Applied Science, A-4600 Wels, Austria; eZelleron GmbH, Collenbusch Strasse. 22, 01324 Dresden, Germany

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(6), 061016 (Aug 26, 2010) (7 pages) doi:10.1115/1.4001354 History: Received December 21, 2009; Revised February 01, 2010; Published August 26, 2010; Online August 26, 2010

The purpose of the first part of this study was to compare four different temperature measuring methods. The application of these tools for possible temperature monitoring or calibration of monitors of microtubular solid oxide fuel cells (MT-SOFCs) is explored. It was found that a thermographic camera is very useful to visualize the temperature gradient on the outside of a cell, while an electrochemical impedance spectroscopy method was useful for estimating the core temperature of a test cell. A standard thermocouple was also used in combination with the previous two methods. Furthermore, an inexpensive laser guided thermometer was also tested for MT-SOFC temperature measurement. This initial study has opened up a range of questions not only about the effect of the experimental apparatus on the measurement results but also about the radial temperature distribution through a MT-SOFC in a working mode. Both these topics will be further investigated in part II of this study through a computational fluid dynamics study. This should provide additional interesting information about any differences between testing single cells and those within a bundle of cells. The discussed results are expected to be mainly temperature related, which should have direct consequences on power output and optimized gas inlet temperatures.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the high temperature wind tunnel

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Figure 2

MT-SOFC and aluminum-oxide cover over a thermocouple for the test chamber temperature regulation (left). Positioning of the thermal camera for image acquisition (right).

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Figure 3

Positioning of the LGT and measurement using a thermocouple

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Figure 4

MT-SOFC under OCV conditions (left) and when producing 1.5 A/cm2 (right) with color scale showing the temperatures in degrees Celsius (°C) in the middle

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Figure 5

The dark, cold line (shown in Fig. 4) on the front of the cell can be removed by subtracting from a MT-SOFC under load image an image taken at OCV (left). The reason for the dark line is that infrared light is not radiated to the cell at the very rear segment (right).

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Figure 6

Temperature gradient around the perimeter of the cell caused by the wind tunnel slit

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Figure 7

The effect of emissivity on the thermal camera measurements. Top three lines points on the cathode, middle four points on the silver. Bottom line shows fluctuation in chamber temperature due to the PID heating control.

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Figure 8

Comparison of the temperature calculated by the EIS method and wall temperature measured by a thermocouple

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Figure 9

The methods are compared on the open cathode zone above the middle silver for a range of current densities produced by the cell

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