1. ME 475/675 Introduction to Combustion Lecture 4

2. 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)

3. 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

4. Standard Enthalpy of Isooctane

5. 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

6. Stoichiometric Methane Combustion, CH 4 Water Vapor

7. Other Bases

8. Per kg of reactant mixture

9. Stoichiometric Reactants T R P R Complete Combustion Products C  CO 2 H  H 2 O P P = P R, T = T Ad

10. Adiabatic Methane Combustion T R = 25°C

11. Example (Turn in next time for Extra Credit) Find T Ad for a 25 ° C Stoichiometric mixture of Acetylene and air