Question

power of fuel cell stack = 90kW,

open circuit voltage =1 V

the area specific resistance is 0.3 ohms cm²

the current density is 1.2 A cm^-2 and the area of each cell is 100 cm², calculate the following:

i) Voltage drop from open circuit and thus each cell’s operating voltage.

ii) Power of each cell.

iii) Number of cells in the stack and overall stack voltage.

iv) Hydrogen consumption (in g hour-1) if operated at a hydrogen stoichiometry of 1.5.

v) Assuming all inefficiencies result in heat generation, how much heat would need to be dissipated from the stack if it were operating at 45% electrical efficiency?

Answer 1

power of fuel cell stack = 90kW,

open circuit voltage =1 V

the area specific resistance is 0.3 ohms cm2

the current density is 1.2 A cm-2 and the area of each cell is 100 cm2, calculate the following:

i) Voltage drop from open circuit and thus each cell’s operating voltage.

ii) Power of each cell.

iii) Number of cells in the stack and overall stack voltage.

iv) Hydrogen consumption (in g hour-1) if operated at a hydrogen stoichiometry of 1.5.

v) Assuming all inefficiencies result in heat generation, how much heat would need to be dissipated from the stack if it were operating at 45% electrical efficiency