Abstract
In the phosphoric acid fuel cell system, it is desirable to be operated at high temperature, because of temperature dependence of system efficiency. But it is regarded that high temperature of the cell above 200°C influences degradation of the electrode and the catalyst loaded on the cell. And also temperature of the cell and current density which is introduced from V-I characteristics are interdependent at the same time. Therefore, leveling off the temperature distribution on the cell is reality in practical fuel cell operation.
We studied two cases of fuel cell system in different flow direction of cooling air in counter flow, and present the calculation result in some conditions by changing the inlet coolant temperature, flow rate and the utilization of oxigen and hydrogen.
