3. Assume that air enters a combustor at a nominal temperature of 600 K and Hexane (C6H14) enters at the reference tempe

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3 Assume That Air Enters A Combustor At A Nominal Temperature Of 600 K And Hexane C6h14 Enters At The Reference Tempe 1 (122.93 KiB) Viewed 96 times

3. Assume that air enters a combustor at a nominal temperature of 600 K and Hexane (C6H14) enters at the reference temperature (298.15 K) creating products of combustion leaving at a nominal temperature of 1600 K. Values given in the table below are in units of kJ/kmol. Values are also given for the heat of formation. In the case of the H2O this would be for a gaseous product. Assume that the heat transfer from the system is negligible. (a). Write a reaction equation for hexane burning with air with c*100% theoretical air. (b). Write an energy balance across the combustor based on one mole of fuel assuming Qdot,cv = 0 and Wdot,cv = 0. (c). Find the percent theoretical air needed to produce the exit temperature of 1600 K. Determine the fuel/air ratio assuming the molecular weight of C6H12 = 86.17 kg/kmol. (d). Const CO2 H2O MW hº Tref=298 K TAIR = 600 K TP = 1600 K 44.01 -393,520 9364 76944 18.02 -241,820 9904 62748 32 8682 17929 52961 28.01 8669 17563 50571 86.17 -167,200 02 N2 |CGH14