It is important to understand the maximum possible thermal efficiency a device is capable of obtaining and then what of this it actually achieves. In this paper it is shown that the thermal efficiency is a product of the voltage efficiency and the maximum possible thermal efficiency. One can mathematically demonstrate that for any elemental direct anodic oxidation reaction for a simple hybrid system, any fuel cell, and any operating temperature, any pressure, the maximum reversible work is equal to the free energy of reaction at the standard state. This is useful in defining an intrinsic fuel cell exergetic efficiency. An equation for thermal efficiency as a product of exergetic efficiency and maximum possible thermal efficiency is developed and presented for loosely integrated fuel cell turbine hybrids. From these simple studies alone one would conclude that the efficiency potential of fuel cells is expanded through simple fuel cell turbine hybrids.
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May 2009
This article was originally published in
Journal of Fuel Cell Science and Technology
Special Section On The 2Nd European Fuel Cell Technology And Applications Conference
Basic Electrochemical Thermodynamic Studies of Fuel Cells and Fuel Cell Hybrids
M. Williams,
M. Williams
University of Utah
, Salt Lake City, UT 84112
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T. Horita,
T. Horita
National Institute of Advanced Industrial Science and Technology
, Tsukuba, Ibaraki 305-8565, Japan
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K. Yamagi,
K. Yamagi
National Institute of Advanced Industrial Science and Technology
, Tsukuba, Ibaraki 305-8565, Japan
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N. Sakai,
N. Sakai
National Institute of Advanced Industrial Science and Technology
, Tsukuba, Ibaraki 305-8565, Japan
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H. Yokokawa
H. Yokokawa
National Institute of Advanced Industrial Science and Technology
, Tsukuba, Ibaraki 305-8565, Japan
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M. Williams
University of Utah
, Salt Lake City, UT 84112
T. Horita
National Institute of Advanced Industrial Science and Technology
, Tsukuba, Ibaraki 305-8565, Japan
K. Yamagi
National Institute of Advanced Industrial Science and Technology
, Tsukuba, Ibaraki 305-8565, Japan
N. Sakai
National Institute of Advanced Industrial Science and Technology
, Tsukuba, Ibaraki 305-8565, Japan
H. Yokokawa
National Institute of Advanced Industrial Science and Technology
, Tsukuba, Ibaraki 305-8565, JapanJ. Fuel Cell Sci. Technol. May 2009, 6(2): 021303 (4 pages)
Published Online: February 27, 2009
Article history
Received:
November 15, 2007
Revised:
December 7, 2007
Published:
February 27, 2009
Citation
Williams, M., Horita, T., Yamagi, K., Sakai, N., and Yokokawa, H. (February 27, 2009). "Basic Electrochemical Thermodynamic Studies of Fuel Cells and Fuel Cell Hybrids." ASME. J. Fuel Cell Sci. Technol. May 2009; 6(2): 021303. https://doi.org/10.1115/1.3080546
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