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FuelCellCalc

# FuelCellCalc - ME 417 Design of Alternative Energy Systems...

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1 ME 417 Design of Alternative Energy Systems Fuel Cell Calculations Reaction Equations Overall reaction for any hydrocarbon fuel reacting with oxygen in air (1)hydrocarbon fuel + (a)O 2 + (a)(3.76)N 2 (b)CO 2 + (c)H 2 O + (a)(3.76)N 2 Solve for a, b, and c by balancing carbon, hydrogen, and oxygen Ion reactions For hydrogen Anode: H 2 2e - + 2H + Cathode: 2e - + 2H + + ½ O 2 H 2 O N e = 2 kmoles of electron/kmole of fuel For hydrocarbon with water Anode: C x H y O z + (2x-z)H 2 O xCO 2 + (4x+y-2z)H + + (4x+y-2z)e - Cathode: (x+y/4-z/2)O 2 + (4x+y-2z)H + + (4x+y-2z)e - (2x+y/2-z)H 2 O N e = (4x+y-2z) kmoles of electron/kmole of fuel Enthalpy and Entropy Evaluations The enthalpy of a reactant or product is taken as i i , f i h h h + = where i , f h : enthalpy of formation for the compound i h : change in enthalpy for the compound as it goes from 298 K and 101 kPa to the fuel cell temperature and pressure For an ideal gas K) 298 at ( h - ) T at ( h h i FC i i = where the s ' h i are read from the ideal gas table for the compound

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FuelCellCalc - ME 417 Design of Alternative Energy Systems...

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