The new dynamic model is presented based on constant fuel utilization control (constant stoichiometry condition).
The model solves the long-standing problem of mixing reversible and irreversible potentials (equilibrium and non-equilibrium states)
in the Nernst voltage expression. Specifically, a Nernstian gain term is introduced for the constant fuel utilization condition, and
it is shown that the Nernstian gain is an irreversibility in the computation of the output voltage of the fuel cell.
| Input |
Description |
Value |
| E0 |
No load voltage [V], Default Value:0.6 |
0.6 |
| KH2 |
Hydrogen valve constant [kmol.s^(-1).atm^(-1)] |
0.000843 |
| KH2O |
Water valve constant [kmol.s^(-1).atm^(-1)] |
0.000281 |
| KO2 |
Oxygen valve constant [kmol.s^(-1).atm^(-1)] |
0.00252 |
| N0 |
Number of cells |
1 |
| R |
Internal ohmic resistance [ohm] (*Optional) |
0.00328125 |
| T |
Fuel cell temperature [K] |
1273 |
| i-start |
Cell operating current start point [A] |
0.1 |
| i-step |
Cell operating current step |
0.1 |
| i-stop |
Cell operating current end point [A] |
300 |
| rho |
Hydrogen-Oxygen flow rate |
1.145 |
| u |
Fuel utilization ratio |
0.8 |