13-13 - 13-13 Equations Set 36: Problem 13-13 Octane burns...

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Unformatted text preview: 13-13 Equations Set 36: Problem 13-13 Octane burns completely with 120% of theoretical air. Determine a) the air fuel ratio on molar and mass bases b) the dew point temperature in C at atmospheric pressure C8H18 + a(O2+3.76 N2) = 8 CO2 + 9 H2O + b O2 + c N2 atheo 2 = 8 2 + 9 a = 1.2 atheo 2a=28+9+2b a 3.76 = c AF mass = a 4.76 AF molar = a 4.76 Pv = 9 P 8+9+b+c MW (Air) MW (C8H18) (1) (2) (3) (4) (5) (6) (7) (8) (9) P = 101.3 [kPa] Tdp = T (W ater, P = Pv , x = 1) Solution Variables in Main program a = 15 atheo = 12.5 P = 101.3 [kPa] Key Variables AF mass = 18.11 AF molar = 71.4 Tdp = 49.42 [C] air-fuel ratio (mass basis) air-fuel ratio (molar basis) dew point temperature at 1 atm AF mass = 18.11 b = 2.5 Pv = 12.01 [kPa] AF molar = 71.4 c = 56.4 Tdp = 49.42 [C] ...
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