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ME 475/675 Introduction to Combustion Lecture 4
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Announcements Extra Credit example due now HW 1 Due Friday Tutorials Wednesday 1 pm PE 113 Thursday 2 pm PE 113 Please bring you textbook to class Please turn in HW on white or engineering paper Grading based on solution (not solely on answers)
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Example: Last lecture (turned in today) Problem 2.14, p 71: Consider a stoichiometric mixture of isooctane and air. Calculate the enthalpy of the mixture at the standard-state temperature (298.15 K) on a per-kmol-of-fuel basis (kJ/kmol fuel ), on a per-kmol-of-mixture basis (kJ/kmol mix ), and on a per-mass-of-mixture basis (kJ/kg mix ). Find enthalpy at 298.15 K of different bases This time (turn in next lecture) Problem 2.15: Repeat for T = 500 K
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Standard Enthalpy of Isooctane
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Enthalpy of Combustion (or reaction) Reactants 298.15 K, P = 1 atm Stoichiometric Products Complete Combustion C CO 2 H H 2 O 298.15 K, 1 atm
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Stoichiometric Methane Combustion, CH 4 Water Vapor
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Other Bases
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Per kg of reactant mixture
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Stoichiometric Reactants T R P R Complete Combustion Products C CO 2 H H 2 O P P = P R, T = T Ad
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Adiabatic Methane Combustion T R = 25°C
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Example (Turn in next time for Extra Credit) Find T Ad for a 25 ° C Stoichiometric mixture of Acetylene and air
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