
664 Appendix B
Hydrogen mass consumption rate:
m
MP
nFV
H
Ht
ec
kg
s
2
2
=
for a stack
m
MP
nFVN
H
Ht
ecc
kg
s
2
2
=
for a cell
Water Production Rate
In terms of total current:
n
I
nF
HO
e
2
mol
s
=
for a cell
n
IN
nF
HO
c
e
2
mol
s
=
for a stack
In terms of power:
n
P
nFV
HO
t
ec
2
mol
s
=
for a stack
Water mass production rate:
m
nFV
HO
HO t
2
2
=
(kg/s) for a stack
m
nFVN
HO
HO t
2
2
=
(kg/s) for a cell
Heat Generation in a Fuel Cell
Reversible heat generation rate:
Q
nF
gen,rev
e
I
∆
for a cell
Q
nF
TSN
gen,rev
e
I
=−
c
∆ for a stack