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

RElectronic [ohm] (*Optional)

0

T

Cell operation temperature [K]

343.15

istart

Cell operating current start point [A]

0

istep

Cell operating current step

0.1

istop

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

EfficiencyPmax

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

VFCPmax

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(LApprox)

Maximum power obtained by linear approximation [W]

28.55564007273787

V0

Intercept of the curve obtained by linear approximation [V]

0.8214952200883945

VFCPmax(LApprox)

Cell voltage at maximum power obtained by linear approximation [V]

0.41074761004419724

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