Research Papers

The Load Dependent Purge Strategy

[+] Author and Article Information
Feras Al-Saleh

Technical University Braunschweig,
Institute of Chemical and Process Engineering,
Langer Kamp 7,
Braunschweig 38106, Germany
e-mail: feras.alsaleh@yahoo.de

Vladimir Buday

Institute of Chemical Technology Prague,
Technicka 5,
Prague 6 166 28, Czech Republic
e-mail: vladimirbuday@seznam.cz

Olaf Klein

Technical University Braunschweig,
Institute of Chemical and Process Engineering,
Langer Kamp 7,
Braunschweig 38106, Germany
e-mail: dr.olafklein@gmx.de

Thomas von Unwerth

Technical University Chemnitz,
Department of Alternative Drivetrains,
Chemnitz, Germany
e-mail: thomas.von-unwerth@mb.tu-chemnitz.de

Stephan Scholl

Universität Braunschweig,
Institut für Chemische
und Thermische Verfahrenstechnik,
Langer Kamp 7,
Braunschweig 38106, Germany
e-mail: s.scholl@tu-braunschweig.de

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received June 28, 2011; final manuscript received September 5, 2013; published online October 17, 2013. Assoc. Editor: Abel Hernandez.

J. Fuel Cell Sci. Technol 11(1), 011001 (Oct 17, 2013) (7 pages) Paper No: FC-11-1086; doi: 10.1115/1.4025518 History: Received June 28, 2011; Revised September 05, 2013

In fuel cell systems with an anode recirculation cycle that runs overstoichiometrically, an undesired enrichment of nitrogen and water vapor occurs due to their diffusion through the membrane-electrode-assembly (MEA). This causes an impairment of the power density. So far, this phenomenon was avoided by a time dependent purge strategy. During this process a lot of unconsumed hydrogen gets wasted. A more efficient purge strategy that reduces the waste and improves the system efficiency, which operates load dependently by means of the mass transfer coefficient, is introduced. A comparison of the system efficiency with and without the load-dependent-purge-strategy (LPS) is made and discussed in order to demonstrate the effectiveness of the new method. Static as well as dynamic system simulations were performed for this purpose. A notable improvement of the system efficiency of up to 10% with LPS was achieved. With LPS the purge power losses could be markedly reduced. This reformation also induces an improvement of the system efficiency, which brings us a considerable step forward towards a longer reach. Moreover, LPS is not restricted to a certain fuel cell system and thus affords a more flexible and versatile employment than its predecessor.

Copyright © 2014 by ASME
Your Session has timed out. Please sign back in to continue.


Al-Saleh, F., 2011, “Thermodynamische Analyse, Modellbildung und Simulation eines Automobilen Brennstoffzellen Antriebssystems,” Ph.D. thesis, ICTV, Technische Universität Braunschweig, Brunswick, Germany.
Larminie, J., and Dicks, A., 2003, Fuel Cell Systems Explained, 2nd ed., Wiley, New York.
Friedrich, K. A., and Aigner, M., 2006, Hybrid-Kraftwerke mit Hochtemperatur Brennstoffzelle und Nachgeschalteter Mikrogasturbine, Tagungsunterlagen F-Cell, Stuttgart, Germany.
Kessler, H. R., Konrad, G., and Sommer, M., 2007, “Brennstoffzellensystem mit einer Brennereinrichtung,” German Patent No. 102005061536A1.
Barbir, F., Balasubramanian, B., and Stone, M., 2006, “Electrochemical Hydrogen Compressor for Electrochemical Cell System and Method for Controlling,” U.S. Patent No. 6,994,929 B2.
Barbir, F., and Görgün, H., 2007, “Electrochemical Hydrogen Pump for Recirculation of Hydrogen in a Fuel Cell Stack,” J. Appl. Electrochem., 37(3), pp. 359-365. [CrossRef]
Bents, D. J., Scullin, V. J., Chang, B.-J., Johnson, D. W., and Garcia, C. P., 2004, “Hydrogen-Oxygen PEM Regenerative Fuel Cell Energy Storage System,” 2004 Fuel Cell Seminar, San Antonio, TX, November 1–5, Paper No. NASA/TM-2005-213381.
Schwarz, T., 2010, “Das Wasserstoffsubsystem und sein Einfluss auf die Kenngrößen des Brennstoffzellenantriebes,” Ph.D. thesis, Technische Universität Clausthal, Clausthal-Zellerfeld, Germany.
Karnik, A. Y., Sun, J., and Buckland, J. H., 2006, “Control Analysis of an Ejector Based Fuel Cell Anode Recirculation System,” American Control Conference, Minneapolis, MN, June 14–16. [CrossRef]
Lee, H. J., and Noh, Y. G., 2008, Hyundai Motors Company, “Hydrogen Recirculation Apparatus Cell Vehicle and Method Thereof,” U.S. Patent No. 2008/0318093 A1.
Herron, T. G., 2001, “System and Method for Optimizing Fuel Cell Purge Cycles,” U.S. Patent No. 6,242,120 B1.
Fogler, H. S., 2005, Elements of Chemical Reaction Engineering, 4th ed., Prentice-Hall, Upper Saddle River, NJ.
Newman, J., and Thomas-Alyea, K. E., 2004, Electrochemical Systems, 3rd ed., John Wiley & Sons, New York.
Green, D., and Perry, R., 2007, Perry's Chemical Engineers Handbook, 8th ed., McGraw-Hill, New York.
McCabe, W., Smith, J., and Harriott, P., 1993, Unit Operations of Chemical Engineering, 5th ed., McGraw-Hill, New York.
Spiegel, C., 2008, PEM Fuel Cell Modeling and Simulation Using MATLAB®, Elsevier, New York.
ECOpoint Inc., 2013, “Emission Test Cycles,” accessed July 21, 2010, http://www.dieselnet.com/standards/cycles


Grahic Jump Location
Fig. 1

A finite control volume of the fuel cell

Grahic Jump Location
Fig. 2

A finite control volume of the cathode

Grahic Jump Location
Fig. 3

A finite control volume of the MEA

Grahic Jump Location
Fig. 4

A finite control volume of the anode

Grahic Jump Location
Fig. 9

Measurement results of the fuel cell drop in performance over time

Grahic Jump Location
Fig. 10

Comparison of the system efficiency with and without LPS

Grahic Jump Location
Fig. 11

Course of the concentration at the anode exit by NEDC

Grahic Jump Location
Fig. 13

Comparison of the system efficiency with and without LPS over the NEDC

Grahic Jump Location
Fig. 6

Dependence of the fuel cell performance of the molar fraction of the water in the recirculation cycle

Grahic Jump Location
Fig. 7

Finite volume model of a HT-PEM-FC with a recirculation cycle and diffusion processes

Grahic Jump Location
Fig. 8

Balance representation of the jet pump

Grahic Jump Location
Fig. 12

Course of the concentration at the anode exit by Japan10_15

Grahic Jump Location
Fig. 5

Dependence of the fuel cell performance of the molar fraction of the nitrogen in the recirculation cycle



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