OPEM Report (Amphlett Model)
What is Amphlett ?
Amphlett static model is a parametric model that predicting the performance of a solid polymer electrolyte,
proton exchange membrane (PEM) fuel cell. Main concepts in the Amphlett model includes Nernst voltage, PEMFC losses
(activation polarization loss, ohmic polarization loss and concentration polarization loss), power and efficiency
of fuel cell. This parametric model of PEMFC using a combination of mechanistic and empirical approach. The ideal
standard potential (Nernst potential) of an H2/O2 FC is 1.229 V with liquid water product. The actual cell potential
is decreased from its reference potential because of irreversible losses.
Inputs
|
Input
|
Description
|
Value
|
|
A
|
Active area [cm^2]
|
50.6
|
|
B
|
An empirical constant depending on the cell and its operation state (Tafel slope) [V]
|
0.016
|
|
JMax
|
maximum current density [A/(cm^2)]
|
1.5
|
|
N
|
Number of single cells
|
1
|
|
PH2
|
Partial pressure [atm]
|
1
|
|
PO2
|
Partial pressure [atm]
|
1
|
|
R
|
R-Electronic [ohm] (*Optional)
|
0
|
|
T
|
Cell operation temperature [K]
|
343.15
|
|
i-start
|
Cell operating current start point [A]
|
0
|
|
i-step
|
Cell operating current step
|
0.1
|
|
i-stop
|
Cell operating current end point [A]
|
75
|
|
l
|
Membrane thickness [cm]
|
0.0178
|
|
lambda
|
An adjustable parameter with a min value of 14 and max value of 23
|
23
|
Overall Parameters
|
Parameter
|
Description
|
Value
|
|
Efficiency|Pmax
|
Cell efficiency at maximum power
|
0.2826255388927661
|
|
Pmax
|
Maximum power [W]
|
29.231394236601012
|
|
Ptotal(Elec)
|
Total electrical power [W]
|
44.92639219548963
|
|
Ptotal(Thermal)
|
Total thermal power [W]
|
47.15960780451031
|
|
VFC|Pmax
|
Cell voltage at maximum power [V]
|
0.44089584067271514
|
Graphs
|
Parameter
|
Description
|
Value
|
|
K
|
Slope of the curve obtained by linear approximation [A^(-1)]
|
-0.005908240849347697
|
|
Pmax(L-Approx)
|
Maximum power obtained by linear approximation [W]
|
28.55564007273787
|
|
V0
|
Intercept of the curve obtained by linear approximation [V]
|
0.8214952200883945
|
|
VFC|Pmax(L-Approx)
|
Cell voltage at maximum power obtained by linear approximation [V]
|
0.41074761004419724
|
Generated By OPEM Version 1.1