APPLIED ENGINEERING THERMODYNAMICS

MAE 115

1.  Propane fuel (C3 H8) is burned with stoichiometric amount of oxygen. Determine  the mole fraction of carbon dioxide and water in the products. Also, calculate the mole number of carbon dioxide in the products per unit mole of fuel burned.

2.  A fuel mixture of 60% by mass methane (CH4) and 40% by mass ethanol

(C2 H6O) is burned completely with theoretical air. If the flow rate of the fuel is 10 kg/s, what is the flow rate of air?

3.  A constant-volume tank contains a mixture of 1 kmol of benzene (C6 H6) gas and 30% excess air at 25oC and 1 atm. The contents of the tankare ignited, and all the hydrogen in the fuel burns to H2O, but only 92% of the carbon burns to CO2 with the remaining 8% going to CO. If the final temperature in the tank is 1000K, determine the heat transfer from the combustion chamber during this process.

4.  A fuel is burnt first with oxygen, then with air. Which case will have a higher adiabatic flame temperature?

5.  Hydrogen (H2) at 27oC is burned with 50% excess air that is also at 27oC.

Combustion occurs at constant pressure, at steady flow, and in an adiabatic

container. Assuming complete combustion, what is the exit temperature of the gases?

6.  Methane at 298K (CH4) is burned with 80% excess air at 1 atm and 298 K. Determine the following:

a)  Considering the production of both NO and CO, the system of equations required to solve for the adiabatic flame temperature of this reaction.

b)  The adiabatic flame temperature of this reaction

7.  Answer the following questions

a.  Above what temperature would you expect the dissociation of diatomic hydrogen (H2) to monatomic hydrogen (H)?

b.  Is the equilibrium process 2/1N2 + 2/1O2 ↔ NO influenced by diluents?

c.  Is the which reaction direction is favored at 3000K for the following reaction (forwards or backwards?): O2 ↔ 2O