Fuel Cell Engines By: Matthew M. Mench Computer Program Problems 3.27 Develop a computer program to calculate the E, E, and th for a hydrogen-air fuel cell as a function of temperature. (a) Plot the LHV th as a function of T between 300 and 1000C at 100C increments. (b) On the same figure, plot the HHVth as a function of T between 300 and 1000C at 100C increments. (c) Check the validity of your model versus a hand calculation at 500C. This is called model verification and is a critical step to assure your computer is giving good results. (d) Compare the accuracy of your exact answers [done by integrating the cp(T) equations] with those done if you assume constant cp (easily done on a spreadsheet by entering a constant value for cp ). Is there a lot of error associated with assuming cp= const