In a Proton Exchange Membrane Fuel Cell, the polymer membrane separating the ano

Question

In a Proton Exchange Membrane Fuel Cell, the polymer membrane separating the anode and the cathode must be kept at a certain degree of humidity. This way, the membrane will allow the flow of hydrogen protons to the cathode side, to form water as a product of the process inside the fuel cell. A fuel cell stack is fed with 1500 kg of moist air. The exhaust gas exiting the stack contains air and water. 60 % of this humid air will be returned to the feed air stream, and the rest will leave through the exhaust gas stream. A diagram of this process is shown in the figure below: Determine the amount of humid air in all of the unknown streams for this process. Determine molar and mass compositions of oxygen in all of the unknown streams Determine the amount of water entering the fuel cell

Explanation / Answer

Actual mass of moist air fed into the Fuel Cell = m2kg

                                                                         = (m1 + m4)kg

m1= 1500kg

m4= 60% of the moist air which is returned to the fed air system

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