The advent of fuel cell technology has increased interest in hydrogen

The advent of fuel cell technology has increased interest in hydrogen. One way that hydrogen can be produced is by electrolysis of water. In a particular process, water at 25◦C and 1 atm together with electrical energy are supplied to an electrolysis cell. The final products from this process are hydrogen and oxygen in separate tanks, each at 100◦C and 5 atm. The necessary electrical energy is 500,000 kJ per kmol of hydrogen. Atmospheric conditions are 25◦C, 1 atm, 40% relative humidity, with 21% oxygen by mole.

a) What is the specific molar exergy of the hydrogen produced in this process?

b) What is the specific molar exergy of the oxygen produced in this process?

c) Determine the required heat transfer per kmol of hydrogen.

d) What is the Second Law efficiency of the overall process?


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