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Fuel Cells
book

Fuel Cells

by Shripad T. Revankar, Pradip Majumdar
May 2014
Beginner to intermediate content levelBeginner to intermediate
748 pages
23h 13m
English
CRC Press
Content preview from Fuel Cells
383Fuel Cell Components and Design
In approach 1, the average conductivity is estimated based on the average
water content in the membrane as
σλσλ(,)()T
T
=−
303
1268
1
303
1
K
exp
,
where the average water content in the membrane is given as
λλ
=
1
0
a
x
a
e
d
e
.
The membrane ohmic resistance is then computed from
η
σλ
ohm
e
ASR==
ii
a
()
.
In approach 2, the membrane ionic resistance is given by integrating over
the membrane thickness as
R
z
t
m
d
a
=
σλ
()
0
(9.15c)
and ohmic loss from
η
ohm
= iR
m
.
9.3.1.10 Water Diffusivity in Naon
Diffusion coefcient of water in Naon-117 is measured experimentally by
Zawodzinski et al. (1991) (Springer et al., 1991) and the ...
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Publisher Resources

ISBN: 9781420089684