For an 11 W proton exchange membrane (PEM) fuel cell, the exergy analysis at different channel geometry and internal parameters such as temperature, pressure, and mass flow rate are investigated experimentally. The geometry of the cell is rectangular, elliptical, and triangular. A PEM fuel cell with $25cm2$ active area and Nafion 117 membrane with 4 mg Pt $cm-2$ for the anode and cathode is employed as a membrane electrode assembly. The results show that when the geometry of the cell is rectangular, the irreversibility of the cell is at lower value and the exergy efficiency is at higher value. Also, the results show that with the increase of hydrogen, oxygen, and cell temperature, the exergy efficiencies of the cell increase and irreversibilities decrease.

## References

1.
Larminie
,
J.
, and
Dicks
,
A.
, 2003,
Fuel Cell System Explained
, 2nd ed.,
Wiley
,
New York
.
2.
Kazim
,
A.
, 2004, “
Exergy Analysis of a PEM Fuel Cell at Variable Operating Conditions
,”
Energy Convers. Manage.
,
45
, pp.
1949
1961
.
3.
Kazim
,
A.
, 2005, “
Exergoeconomic Analysis of a PEM Fuel Cell at Various Operating Conditions
,”
Energy Convers. Manage.
,
46
, pp.
1073
1081
.
4.
Cownden
,
R.
,
Nahon
,
M.
, and
Rosen
,
M. A.
, 2001, “
Modelling and Analysis of a Solid Polymer Fuel Cell System for Transportation Applications
,”
Int. J. Hydrogen Energy
,
26
, pp.
615
623
.
5.
Xue
,
D.
, and
Dong
,
Z.
, 1998, “
Optimal Fuel Cell System Design Considering Functional Performance and Production Costs
,”
J. Power Sources
,
76
(
1
), pp.
69
80
.
6.
Miansari
,
M.
,
Sedighi
,
K.
,
Amidpour
,
M.
,
,
E.
, and
Miansari
,
M. O.
, 2009, “
Experimental and Thermodynamic Approach on Proton Exchange Membrane Fuel Cell Performance
,”
J. Power Source
,
190
, pp.
356
361
.
7.
Yilanci
,
A.
,
Dincer
,
I.
, and
Ozturk
,
H. K.
, 2008, “
Performance Analysis of a PEM Fuel Cell Unit in a Solar-Hydrogen System
,”
Int. J. Hydrogen Energy
,
33
, pp.
7538
7552
.
8.
Dincer
,
I.
, 2002, “
The Role of Exergy in Energy Policy Making
,”
Energy Policy
,
30
, pp.
137
149
.
9.
Wark
,
K.
, Jr.
, 1995,
, 1st ed.,
McGraw-Hill, Inc.
,
New York
.
10.
Ay
,
M.
,
Midilli
,
A.
, and
Dincer
,
I.
, 2006, “
Thermodynamic Modeling of a Proton Exchange Membrane Fuel Cell
,”
Int. J. Exergy
,
3
(
1
), pp.
16
44
.