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6 - MEM 415 FUEL CELL ENGINES Lecture 6-THERMODYNAMICS AND...

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2/12/2011 1 -- Lecture # 6 -- MEM 415– FUEL CELL ENGINES THERMODYNAMICS AND POLARIZATION (Region V) – Additional Notes Dr. E. Caglan Kumbur Assistant Professor of Mechanical Engineering Office: Curtis 160 Ph: 215.895.5871 e-mail: [email protected] -- Feb 14, 2010 -- MEM 415– Lecture #6 Sample Problems…. Problem on Thermodynamics Effect of Oxygen Enhancement Given an H 2 -air fuel cell operating at 100 C with vapor phase water as the product. Determine the approximate expected change in voltage if air is replaced with oxygen , with all these remaining the same. Solution: ) / ( ) / ( ) / ( ) / ( ln ) ( ) , ( ! " # $ % & ( ) * D C B A o D o c o B o A u o P P P P P P P P nF T R nF T G P T E + + + + Nernst Equation ) ( ) ( ) ( ln ) ( ) , ( 1 5 . 0 1 2 2 2 ! ! " # $ $ % & ( ) * O H O H u o a a a nF T R nF T G P T E Nernst Equation for H2 PEM fuel cell So the only difference is the mole fractions for oxygen between these two cases. Air Oxygen Different MEM 415– Lecture #6
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2/12/2011 2 Sample Problems…. Problem on Thermodynamics Effect of Oxygen Enhancement Given an H 2 -air fuel cell operating at 100 C with vapor phase water as the product.
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