0
SPECIAL SECTION ON THE 2ND EUROPEAN FUEL CELL TECHNOLOGY AND APPLICATIONS CONFERENCE

Basic Electrochemical Thermodynamic Studies of Fuel Cells and Fuel Cell Hybrids

[+] Author and Article Information
M. Williams

 University of Utah, Salt Lake City, UT 84112

T. Horita, K. Yamagi, N. Sakai, H. Yokokawa

 National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan

J. Fuel Cell Sci. Technol 6(2), 021303 (Feb 27, 2009) (4 pages) doi:10.1115/1.3080546 History: Received November 15, 2007; Revised December 07, 2007; Published February 27, 2009

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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Maximum efficiencies

Grahic Jump Location
Figure 2

Maximum exergetic efficiency

Grahic Jump Location
Figure 3

Simple hybrid system

Grahic Jump Location
Figure 5

Maximum efficiencies—medium case

Grahic Jump Location
Figure 6

Maximum efficiencies—low case

Grahic Jump Location
Figure 4

Maximum efficiencies—high case

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In