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Fuel Cell Handbook (Seventh Edition)

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Fuel Cell Handbook (Seventh Edition) ( fuel-cell-handbook-seventh-edition )

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700 600 500 400 300 200 100 373.1F 30F Pinch 403.1F 0 0 0.2 0.4 0.6 0.8 1 Q, MMBtu/hr 9.3 Supporting Calculations Example 9-14 Molecular Weight, Density and Heating Value Calculations Given the fuel gas composition presented below, what is (a) the molecular weight, (b) the higher heating value in Btu/ft3? (c) the density of the gas in lb/ft3 at 1 atm and 60 oF? (d) the higher heating value in Btu/lb, and (e) the lower heating value in Btu/ft3? 295F 60F Fuel Constituent CH4 CO CO2 H2 H2O T otal mol percent 4.0 0.4 17.6 75.0 3.0 100.0 Solution: (a) Before determining the molecular weight of the fuel gas mixture, develop the molecular weights of each of the gas constituents in the following table: Fuel Constituent CH4 CO CO2 H2 H2O MW Derivation (12.01) + 4*(1.008) = 16.04 (12.01) + 1*(16.00) = 28.01 (12.01) + 2*(16.00) = 44.01 2*(1.008) = 2.016 2*(1.008) +1*(16.00) = 18.02 MW 16.04 28.01 44.01 2.016 18.02 9-22 Temperature, F

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