Thermodynamics: An Engineering Approach
9th Edition
ISBN: 9781259822674
Author: Yunus A. Cengel Dr., Michael A. Boles
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Videos
Question
Chapter 15.7, Problem 26P
To determine
How many
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Liquid octane is burned completely with 75% excess air. Determine the air-fuel ratio for this combustion process.
Acetylene (C2H2) is burned with the stoichiometric amount of air during a combustion process. Assume complete combustion.
Part A
Determine the air-fuel ratio on a mass basis.
Part B
Determine the air-fuel ratio on a mole basis.
Part C
What-if scenario: What would the air to fuel ratio on a mass basis be if propene (C3H6) was burned instead of acetylene?
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
Chapter 15 Solutions
Thermodynamics: An Engineering Approach
Ch. 15.7 - What are the approximate chemical compositions of...Ch. 15.7 - How does the presence of N2 in air affect the...Ch. 15.7 - Prob. 3PCh. 15.7 - Prob. 4PCh. 15.7 - Is the airfuel ratio expressed on a mole basis...Ch. 15.7 - How does the presence of moisture in air affect...Ch. 15.7 - Prob. 7PCh. 15.7 - Prob. 8PCh. 15.7 - Prob. 9PCh. 15.7 - Are complete combustion and theoretical combustion...
Ch. 15.7 - What does 100 percent theoretical air represent?Ch. 15.7 - Consider a fuel that is burned with (a) 130...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. 16PCh. 15.7 - n-Butane fuel (C4H10) is burned with the...Ch. 15.7 - Prob. 18PCh. 15.7 - Propane (C3H8) is burned with 75 percent excess...Ch. 15.7 - Propane fuel (C3H8) is burned with 30 percent...Ch. 15.7 - In a combustion chamber, ethane (C2H6) is burned...Ch. 15.7 - Prob. 22PCh. 15.7 - Prob. 23PCh. 15.7 - Ethane (C2H6) is burned with 20 percent excess air...Ch. 15.7 - Octane (C8H18) is burned with 250 percent...Ch. 15.7 - Prob. 26PCh. 15.7 - A fuel mixture of 60 percent by mass methane (CH4)...Ch. 15.7 - Prob. 28PCh. 15.7 - A certain natural gas has the following volumetric...Ch. 15.7 - Prob. 30PCh. 15.7 - A gaseous fuel with a volumetric analysis of 45...Ch. 15.7 - Prob. 33PCh. 15.7 - The fuel mixer in a natural gas burner mixes...Ch. 15.7 - Prob. 35PCh. 15.7 - Prob. 36PCh. 15.7 - Determine the fuelair ratio when coal from...Ch. 15.7 - Prob. 38PCh. 15.7 - Prob. 39PCh. 15.7 - Prob. 40PCh. 15.7 - Prob. 41PCh. 15.7 - When are the enthalpy of formation and the...Ch. 15.7 - Prob. 43PCh. 15.7 - Prob. 44PCh. 15.7 - Prob. 45PCh. 15.7 - Prob. 46PCh. 15.7 - Prob. 48PCh. 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. 53PCh. 15.7 - Consider a complete combustion process during...Ch. 15.7 - Prob. 56PCh. 15.7 - Prob. 57PCh. 15.7 - Prob. 58PCh. 15.7 - Propane fuel (C3H8) is burned with an airfuel...Ch. 15.7 - Prob. 60PCh. 15.7 - Prob. 61PCh. 15.7 - Prob. 62PCh. 15.7 - Octane gas (C8H18) at 25C is burned steadily with...Ch. 15.7 - Liquid ethyl alcohol [C2H5OH(l)] at 25C is burned...Ch. 15.7 - Prob. 66PCh. 15.7 - A gaseous fuel mixture that is 40 percent propane...Ch. 15.7 - A constant-volume tank contains a mixture of 120 g...Ch. 15.7 - Prob. 70PCh. 15.7 - Prob. 71PCh. 15.7 - Prob. 72PCh. 15.7 - A fuel is completely burned first with the...Ch. 15.7 - Prob. 74PCh. 15.7 - Prob. 75PCh. 15.7 - What is the adiabatic flame temperature of methane...Ch. 15.7 - Octane gas (C8H18) at 25C is burned steadily with...Ch. 15.7 - Acetylene gas (C2H2) at 25C is burned during a...Ch. 15.7 - Ethyl alcohol [C2H5OH(g)] is burned with 200...Ch. 15.7 - Prob. 81PCh. 15.7 - Prob. 82PCh. 15.7 - Reconsider Prob. 1582. The combustion products are...Ch. 15.7 - Express the increase of entropy principle for...Ch. 15.7 - Prob. 85PCh. 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 - Prob. 88PCh. 15.7 - Reconsider Prob. 1588. The automobile engine is to...Ch. 15.7 - Benzene gas (C6H6) at 1 atm and 77F is burned...Ch. 15.7 - Prob. 91PCh. 15.7 - n-Octane [C8H18(l)] is burned in the...Ch. 15.7 - A steady-flow combustion chamber is supplied with...Ch. 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 - n-Butane (C4H10) is burned with the stoichiometric...Ch. 15.7 - A gaseous fuel mixture of 60 percent propane...Ch. 15.7 - Calculate the higher and lower heating values of...Ch. 15.7 - Prob. 103RPCh. 15.7 - Methane gas (CH4) at 25C is burned steadily with...Ch. 15.7 - A 6-m3 rigid tank initially contains a mixture of...Ch. 15.7 - Propane gas (C3H8) enters a steady-flow combustion...Ch. 15.7 - Determine the highest possible temperature that...Ch. 15.7 - Liquid propane [C3H8(l)] enters a combustion...Ch. 15.7 - Prob. 109RPCh. 15.7 - Prob. 110RPCh. 15.7 - Prob. 111RPCh. 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. 115RPCh. 15.7 - Consider the combustion of a mixture of an...Ch. 15.7 - Prob. 117RPCh. 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. 126FEPCh. 15.7 - One kmol of methane (CH4) is burned with an...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 - An equimolar mixture of carbon dioxide and water...Ch. 15.7 - A fuel is burned during a steady-flow combustion...
Knowledge Booster
Learn more about
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
- The reactant side has the following volumetric analysis for fuels burned simultaneously: CH₄= 68% and C₂H6= 32%. Assume a complete combustion with 15% excess air at 101.325 kPa, what is the partial pressure of water vapor in kPa.arrow_forwardThis is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Ethane (C2H6) is burned with 20 percent excess air during a combustion process. Assume complete combustion and a total pressure of 180 kPa. Use data from the tables. CH. Combustion CO, H,0 02, N, chamber Air X kPa 20% excess where X= 180 Determine the air-fuel ratio. (You must provide an answer before moving on to the next part.) The air-fuel ratio is kg air/kg fuel.arrow_forwardThere is a well-insulated open combustion chamber that ethane (C2H6) goes into at 77°F and 1 atm. The theoretical amount of air also enters at 220°F and 1 atm. The combustion is complete. Determine: a) The temperature of the combustion products coming out (°F)arrow_forward
- The fuel has the following volumetric analysis: CH4 = 60% C2H6 = 40% Assume complete combustion with 25% excess air at 101.325 kPa and 27 degrees dry bulb temperature. What is the actual fuel-air ratio?arrow_forwardn-Octane gas (C8H18) is burned with 80% excess air in a constant pressure burner. The air and fuel enter this burner steadily at standard conditions and the products of combustion leave at 217°C. Calculate the heat transfer, in kJ/kg fuel, during this combustion. C8H18 25°C 80% excess air 25°C Qout Combustion chamber P = 1 atm Products 217°Carrow_forwardDetermine the equivalence ratio for the complete combustion of n-Butane (C4H10) with 50% excess air.arrow_forward
- C4Hs is burned in an engine with a fuel-rich air-fuel ratio. Dry analysis of the exhaust gives the following volume percents: CO2 = 14.95%, C4H8 0.75%, CO = 0%, H2 = 0%, O2 = 0%, with the rest being N2. Higher heating value of this fuel is QHHV = 46.9 MJ/kg. Write the balanced chemical equation for one mole of this fuel at these conditions. Calculate; a) Air-fuel ratio. b) Equivalence ratio. c) Lower heating value of fuel. [MJ/kg] d) Energy released when one kg of this fuel is burned in the engine with a combustion efficiency of 98%. [MJ]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_forwardIsooctane is burned with theoretical air with 20% excess air during the combustion process in a small 3 – cylinder turbocharged automobile engine. Calculate: 1. Air – fuel ratio 2. Fuel – air ration 3. Equivalence ratio Stoichiometric reaction: _C3H8 + 02 + N2 → _CO2+ _H,0 + N2 With 20% excess air: _C3H8 + 02 + N2 →, CO2 + _H20 +. N2arrow_forward
- Ethylene (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_forwardEthane (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_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
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning
Refrigeration and Air Conditioning Technology (Mi...
Mechanical Engineering
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:Cengage Learning
Extent of Reaction; Author: LearnChemE;https://www.youtube.com/watch?v=__stMf3OLP4;License: Standard Youtube License