1. For each case of stoichiometric, 25% excess air, and 150% theoretical air wit
ID: 935625 • Letter: 1
Question
1. For each case of stoichiometric, 25% excess air, and 150% theoretical air with ethyl alcohol gas (C2H5OH), determine (a) the air-fuel ratio and (b) equivalence ratio of the exhaust Assume complete combustion and a total pressure of 1 atm. (15 points) 2. For ethane (CH4) at 1 atm and 25 degree C, determine (a) the enthalpy of combustion, (b) the lower heating value, and (c) compare the value in Table A-27. (15 points) 3. Ethanol (C2H6O) burns with air, giving products having the dry molar analysis of 11.0% CO2, 1.0% CO, 3.5% O2, and 84.5% N2. Determine: (a) the percent theoretical air, (b) mass fraction of the exhaust products, and (b) the dew point of the combustion products, in degree C, at 100 kPa. Assume = -277.000 kJ/kmol (15 Points) 4. A boiler uses n-dodecane (C12H26) as the operating fuel with an air-fuel ratio of 22, The fuel enters the combustion chamber at 1 atm and 25 degree C and exits the boiler as combustion gases at 600 K. The water enters the boiler as a saturated liquid at 2000 kPa and exits at 400 degree C. Determine (a) the amount of steam generated (kg of steam/kg of fuel) and (b) the rate of heat transfer to the water (kJ/kg of fuel). (25 points) 5. Calculate the adiabatic flame temperature of n-dodecane (C12H26) burning with stoichiometric dry air. Assume the fuel and air enter a combustor at steady state at 25 degree C and 1 atm and the products of combustion exit at 1 atm. (30 Points)Explanation / Answer
a)
C2H5OHgas + 3O2gas
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