Maldistribution of fuel across the cells of a fuel cell stack is an issue that can contribute to poor cell performance and possible cell failure. It has been proposed that an array of microvalves could promote even distribution of fuel across a fuel cell stack. A piezoelectric microvalve has been developed for this purpose. This valve can be tuned to a nominal flow rate (and failure position) from which the actuator would either increase or decrease the flow rate and fuel. The valve can successfully regulate the flow of fuel from 0.7 to 1.1 slpm of hydrogen in the range of temperatures from 80° to 100°C and has been tested over pressure drops from 0.5 to 1 psi. A bank of these valves is currently being tested in a four-cell stack at the U.S. Department of Energy National Energy Technology Laboratory.

1.
Fuel Cell Handbook, 5th ed. EG&G Services, Parsons Inc., US Department of Energy, Office of Fossil Energy, National Energy Technology Laboratory, West Virginia, 2000.
2.
Kawatsu
S.
, “
Advanced PEFC development for fuel cell powered vehicles
,”
Journal of Power Sources
, Vol.
71
, pp.
150
155
,
1998
3.
Lee
H. I.
,
Lee
C. H.
,
Oh
T. Y.
,
Choi
S. G.
,
Park
I. W.
,
Baek
K. K.
, “
Development of lkW class polymer electrolyte membrane fuel cell power generation system
,”
Journal of Power Sources
, Vol.
107
pp.
110
119
,
2002
4.
Hamelin
J.
,
Agbossou
K.
,
Laperriere
A.
,
Laurencelle
F.
,
Bose
T. K.
, “
Dynamic behavior of a PEM fuel cell stack for stationary applications
,”
International Journal of Hydrogen Energy
, Vol.
26
, pp.
625
629
,
2001
5.
Moore
J. M.
,
Lakeman
J. B.
,
Mepsted
G. O
, “
Development of a PEM fuel cell powered portable field generator for the dismounted soldier
,”
Journal of Power Sources
, Vol
106
, pp.
16
20
,
2002
6.
Barbir
F.
and
Gomez
T.
, “
Efficiency and Economics of Proton Exchange Membrane (PEM) Fuel Cells
,
International Journal of Hydrogen Energy
, Vol.
22
, No.
10/11
, pp.
1027
1037
,
1997
7.
Kazmin
A.
, “
A novel approach on the determination of the minimal operating efficiency of a PEM fuel cell
”,
Renewable Energy
, Vol
26
, pp.
479
488
,
2002
8.
Lee
H. I.
,
Lee
C. H.
,
Oh
T. Y.
,
Choi
S. G.
,
Park
I. W.
,
Baek
K. K.
, “
Development of lkW class polymer electrolyte membrane fuel cell power generation system
,”
Journal of Power Sources
, Vol.
107
pp.
110
119
,
2002
9.
Voss
H. H.
,
Wilkinson
D. P.
,
Pickup
P. G.
,
Johnson
M C.
,
Basura
V.
, “
Anode Water Removal: A Water Management and Diagnostic Technique for Solid Polymer Fuel Cells
,”
Electrochimica Acta
, Vol.
40
, No.
3
, pp.
321
328
,
1995
10.
J. Peter Hensel, Randall S. Gemmen, Jimmy D. Thornton, Jeffrey S. Vipperman, William W. Clark, Brian A. Bucci. “Effects of Cell-to-Cell Fuel Mai-Distribution on Fuel Cell Performance and a Means to Reduce Mal-Distribution using MEMS Micro-Valves,” submitted to the Journal of Power Sources, July, 2006.
11.
Jeffrey S. Vipperman, William W. Clark “Microelectromechanical Valve Design and Control for PEM Fuel Cell Systems”, Report to NETL, April 17, 2002
12.
Fatih Ayhan, Jeffrey Vipperman, William Clark, Jimmy Thornton, Randall Gemmen, “Fabrication and Preliminary Testing of a Novel Piezoelectically Actuated Microvalve.” IMECE2003-41482.
13.
Jeffrey Vipperman, Fatih Ayhan, William Clark, Jimmy Thornton, Randall Gemmen, “A Novel Piezoelectrically Actuated Microvalve for Flow Control in a PEM Fuel Cell.”, IMECE2002-34320.
14.
J. Peter Hensel, Randall S. Gemmen, Brian J. Hetzer, Jimmy Thornton, Jeffrey Vipperman, William Clark, Fatih Ayhan. “Fuel Cell Performance Improvements Using Cell-to-Cell Flow Distribution Control”, ASME Fuel Cell Science, Engineering and Technology - FuelCell2004-2482.
15.
Jeffrey Vipperman, William Clark. “MEMS Microvalve Technology Phase II”, Report to NETL, January 10, 2005
16.
Shuchi Shoji, Masayoshi Esashi. “Microflow Devices and Systems”. Journal Micromech. Microeng. 1994.
17.
Yang, Eui-Hyeok, Lee, Choonsup, Mueller, Juergen, Thomas, George. “Leak-Tight Piezoelectric Microvalve for High-Pressure Gas Micropropulsion”. Journal of Microelectromechanical Systems Vol. 13, no. 5 October 2004.
18.
Masayosi Esashi. “Integrated Micro Flow Control Systems”. Sensors and Actuators. 1990.
19.
Hosokawa, Kazuo, Maeda, Ryutaro. “A Pneumatically-actuated Three-way Microvalve Fabricated with Polydimethylsiloxane using the Membrane Transfer Technique.” Journal Micromech. Microeng. 2000.
20.
M. Kohl, D. Dittmann, E. Quandt, B. Winzek. “Thin Film Shape Memory with adjustable Operation Temperature”. Sensors and Actuators. 2000.
21.
S. Messner, M. Miller, V. Burger, J. Schaible, H. Sandmaier, R. Zengerle, “A Normally-Closed, Bimetallically Actuated 3-way Microvalve for Pneumatic Applications”, IEEE, 1998.
22.
A. Fatih Ayhan, 2002, Design of a Piezoelectrically Actuated Microvalve for Flow Control in Fuel Cells, Masters Thesis, University of Pittsburgh.
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