Thermodynamics: An Engineering Approach
8th Edition
ISBN: 9780073398174
Author: Yunus A. Cengel Dr., Michael A. Boles
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 15.7, Problem 9P
Consider a fuel that is burned with (a) 130 percent theoretical air and (b) 70 percent excess air. In which case is the fuel burned with more air?
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Dodecane is burned at constant pressure with 120% excess air. What is the actual air fuel ratio for this process?
(A) 55
(B) 22
44
(D) 33
Methanol (CH3OH) is burned with 50% excess air. Write the balanced reaction equations
for complete and actual combustion, and then determine (a) the actual air-to-fuel ratio,
and (b) the enthalpy of the complete combustion of Methanol at 25°C and 1 atm
assuming H₂O in the products is in the liquid form.
N₁
hc=Hp-HR=Nphp-ENRIR
TABLE 32
Standard enthalpies of formation
Species
State!
0₁
Gas
Gav
Ga
Gas
Gas
Gas
H₁
C.
Co,
но
1,0
CO
Useful relations:
Mair
123 ful
C,H,
CH,OH
CH,OH
Liqind
Gas
Gas
Gas
Gas
Liquid
Gas
Liquid
AF
C₂B₁
сн..
At 298.15 K (25 C) and 1 aus
Ah,, MJ/kmol
0
0
0
0
-393.52
241.83
285.84
110.54
-74.87
-101.85
-201.17
238.58
208.45
249.35
Liquid octane is burned completely with 75% excess air. Determine the air-fuel ratio for this combustion process.
Chapter 15 Solutions
Thermodynamics: An Engineering Approach
Ch. 15.7 - How does the presence of N2 in air affect the...Ch. 15.7 - Prob. 2PCh. 15.7 - Prob. 3PCh. 15.7 - Is the airfuel ratio expressed on a mole basis...Ch. 15.7 - Prob. 5PCh. 15.7 - Prob. 6PCh. 15.7 - Prob. 7PCh. 15.7 - What does 100 percent theoretical air represent?Ch. 15.7 - Consider a fuel that is burned with (a) 130...Ch. 15.7 - Are complete combustion and theoretical combustion...
Ch. 15.7 - What are the causes of incomplete combustion?Ch. 15.7 - Which is more likely to be found in the products...Ch. 15.7 - Methane (CH4) is burned with the stoichiometric...Ch. 15.7 - Prob. 14PCh. 15.7 - n-Butane fuel (C4H10) is burned with the...Ch. 15.7 - Prob. 16PCh. 15.7 - Prob. 17PCh. 15.7 - 15–18 n-Octane (C8H18) is burned with 50 percent...Ch. 15.7 - In a combustion chamber, ethane (C2H6) is burned...Ch. 15.7 - Prob. 20PCh. 15.7 - Prob. 21PCh. 15.7 - 15–22 One kilogram of butane (C4H10) is burned...Ch. 15.7 - 15–23E One lbm of butane (C4H10) is burned with 25...Ch. 15.7 - Prob. 24PCh. 15.7 - A fuel mixture of 60 percent by mass methane (CH4)...Ch. 15.7 - A certain natural gas has the following volumetric...Ch. 15.7 - Prob. 27PCh. 15.7 - A gaseous fuel with a volumetric analysis of 45...Ch. 15.7 - Prob. 30PCh. 15.7 - 15–31 Octane (C8H18) is burned with dry air. The...Ch. 15.7 - Prob. 32PCh. 15.7 - Prob. 33PCh. 15.7 - Prob. 34PCh. 15.7 - Prob. 35PCh. 15.7 - Prob. 36PCh. 15.7 - Prob. 37PCh. 15.7 - Prob. 38PCh. 15.7 - Prob. 39PCh. 15.7 - Prob. 40PCh. 15.7 - Prob. 41PCh. 15.7 - Prob. 42PCh. 15.7 - Prob. 44PCh. 15.7 - Repeat Prob. 1546 for liquid octane (C8H18).Ch. 15.7 - Ethane (C2H6) is burned at atmospheric pressure...Ch. 15.7 - Reconsider Prob. 1550. What minimum pressure of...Ch. 15.7 - Calculate the HHV and LHV of gaseous n-octane fuel...Ch. 15.7 - Prob. 49PCh. 15.7 - Prob. 50PCh. 15.7 - Consider a complete combustion process during...Ch. 15.7 - Prob. 53PCh. 15.7 - Prob. 54PCh. 15.7 - Propane fuel (C3H8) is burned with an airfuel...Ch. 15.7 - 15–56 Hydrogen (H2) is burned completely with the...Ch. 15.7 - Prob. 57PCh. 15.7 - Prob. 58PCh. 15.7 - Octane gas (C8H18) at 25C is burned steadily with...Ch. 15.7 - Prob. 61PCh. 15.7 - Liquid ethyl alcohol [C2H5OH(l)] at 25C is burned...Ch. 15.7 - Prob. 63PCh. 15.7 - Prob. 64PCh. 15.7 - A constant-volume tank contains a mixture of 120 g...Ch. 15.7 - Prob. 67PCh. 15.7 - Prob. 68PCh. 15.7 - Prob. 69PCh. 15.7 - A fuel is completely burned first with the...Ch. 15.7 - Prob. 71PCh. 15.7 - Acetylene gas (C2H2) at 25C is burned during a...Ch. 15.7 - Octane gas (C8H18) at 25C is burned steadily with...Ch. 15.7 - Express the increase of entropy principle for...Ch. 15.7 - Prob. 81PCh. 15.7 - What does the Gibbs function of formation gf of a...Ch. 15.7 - Liquid octane (C8H18) enters a steady-flow...Ch. 15.7 - Benzene gas (C6H6) at 1 atm and 77F is burned...Ch. 15.7 - Prob. 87PCh. 15.7 - Prob. 88PCh. 15.7 - A steady-flow combustion chamber is supplied with...Ch. 15.7 - Prob. 91RPCh. 15.7 - 15–92 A gaseous fuel with 80 percent CH4, 15...Ch. 15.7 - Prob. 93RPCh. 15.7 - Prob. 94RPCh. 15.7 - Prob. 95RPCh. 15.7 - Prob. 96RPCh. 15.7 - Prob. 97RPCh. 15.7 - Prob. 98RPCh. 15.7 - Prob. 99RPCh. 15.7 - Prob. 100RPCh. 15.7 - A 6-m3 rigid tank initially contains a mixture of...Ch. 15.7 - Prob. 102RPCh. 15.7 - Propane gas (C3H8) enters a steady-flow combustion...Ch. 15.7 - Determine the highest possible temperature that...Ch. 15.7 - Prob. 106RPCh. 15.7 - Prob. 107RPCh. 15.7 - A steam boiler heats liquid water at 200C to...Ch. 15.7 - Repeat Prob. 15112 using a coal from Utah that has...Ch. 15.7 - Liquid octane (C8H18) enters a steady-flow...Ch. 15.7 - Prob. 111RPCh. 15.7 - Prob. 112RPCh. 15.7 - Prob. 113RPCh. 15.7 - Consider the combustion of a mixture of an...Ch. 15.7 - A fuel is burned steadily in a combustion chamber....Ch. 15.7 - A fuel is burned with 70 percent theoretical air....Ch. 15.7 - Prob. 123FEPCh. 15.7 - One kmol of methane (CH4) is burned with an...Ch. 15.7 - An equimolar mixture of carbon dioxide and water...Ch. 15.7 - The higher heating value of a hydrocarbon fuel...Ch. 15.7 - Acetylene gas (C2H2) is burned completely during a...Ch. 15.7 - Prob. 129FEPCh. 15.7 - A fuel is burned during a steady-flow combustion...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Liquid octane at 25°C and 0,1MPA is burned in 96% theoretical air at 25°C. The exit temperature is 600K. How much energy is emitted to the environment? (4.19x10°kJ/kmol)arrow_forwardEthane (C2H6) is burned completely with 25% excess air. Show the combustion reaction of fuel and air. Determine the actual air-fuel ratio in kgair/kgfuel.arrow_forward1 kmol C2H6 is burned with an unknown amount of air. At the end of combustion since it is known that there is 3 kmol free oxygen in the combustion products, the air fuel ratio and calculate the theoretical percentage of air used during this process.arrow_forward
- A gaseous fuel with 80% butane, 15% nitrogen and 5% oxygen (on a mole basis) is burned to completion with 120 percent theoretical air that enters the combustion chamber at 30°C and 100 kPa. Determine the volume flow rate of air required to burn fuel at a rate of 2 kg/min.arrow_forwardA sample of coal was found to have the following percentage composition C=75 %, H2 = 5.2 %, O2 = 12.8 %, N2 = 1.2 % and the rest ash. Calculate the amount of air needed for the complete combustion if 1 kg of the coal is burnt with 30 % excess air.arrow_forwardEthane (C2H6) is burned with 20% excess air during a combustion process. Assuming completecombustion and a total pressure of 100 kPa, determine:1. the A/F ratio.2. the dew point temperature of the products.arrow_forward
- Ethane (C2H6) is burned with atmospheric air and the volumetric analysis of the dry products of combustion yields the following: 10% CO2, 1% CO, 3% 02 and 86% N2. Develop the combustion equation and determine (a) the percentage of the excess air (b) the air fuel ratio. (Solve for 100 kmol of dry products).arrow_forwardH.W.3.5 Propylene (C3H6) is burned with 50 percent excess air during a combustion process. Assuming complete combustion and a total pressure of 105 kPa, determine (a) the air-fuel ratio and (b) the temperature at which the water vapor in the products will start condensing (c) the product analysis based on volume and mass.arrow_forwardQuestion No. 11: One kmol of octane C8H18 is burned with air that contains 20kmol of O2. Assuming the product contains only CO2, H20, 02and N2, determine the mol number of each gas in the products and the air-fuel ratio for this combustion process.arrow_forward
- Isooctane is burned with 12% insufficient air.Determine: (a) amount of moles of air needed for this combustion(b) mass of carbon monoxide in the products of combustionarrow_forward5. Dodecane is burned at constant pressure with 120% excess air. What is the air-fuel ratio for this process?arrow_forwardEthylene (C₂H4) is burned with 180% theoretical air during a combustion process. Assuming that the combustion is complete and the pressure of the combustion products is 100 kPa, determine (a) the air-fuel ratio and (b) the dew point temperature of the products.arrow_forward
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