THERMODYNAMICS (LL)-W/ACCESS >CUSTOM<
9th Edition
ISBN: 9781266657610
Author: CENGEL
Publisher: MCG CUSTOM
expand_more
expand_more
format_list_bulleted
Textbook Question
Chapter 15.7, Problem 129FEP
The higher heating value of a hydrocarbon fuel CnHm with m = 8 is given to be 1560 MJ/kmol of fuel. Then its lower heating value is
(a)
1384 MJ/kmol
(b)
1208 MJ/kmol
(c)
1402 MJ/kmol
(d)
1514 MJ/kmol
(e)
1551 MJ/kmol
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
C,Hs is burned in an engine with a fuel-rich air-fuel ratio. Dry analysis of the exhaust gives
the following volume percents: CO, 14.95%, C,H, 0.75%, CO 0%.
H = 0%, O, 0%, with the rest being
N. Higher heating value of this fuel is Quav 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]
Ql:- C4HS is burned in an engine with a fuel-rich air-fuel ratio. Dry analysis of the exhaust gives the
following volume percents: COz 14.95%, C4HS 0.75%, CO 0%, Hz 0%, Oz 0%, with the rest being
Nz. 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 the fuel. [MJ/kg]
(d) The energy released when one kg of this fuel is burned in the engine with a combustion efficiency of 98%.
[MJ]
1. Which of the following has higher positional entropy?
a. Solid CO2 or Gaseous CO2?
b. N2 gas at 1 atm or N2 gas at 1.0 x 102 atm?
Chapter 15 Solutions
THERMODYNAMICS (LL)-W/ACCESS >CUSTOM<
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
- C,Hg is burned in an engine with a fuel-rich air-fuel ratio. Dry analysis of the exhaust gives the following volume percents: CO, = 14.95%, C,Hg = 0.75%, CO = 0%, H2 = 0%, O, = 0%, with the rest being N. 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]arrow_forwardRP-1 is highly refined form of kerosene used for many first stage rocket engines. The average composition of it is indicated by CH1.9 a. What is the stoichiometric mixture ratio (MR) for RP-1 and oxygen? b. Now, you have a mixture of air and RP-1 with three times more air (in terms of moles) than is needed to burn all the fuel. How high is the final temperature? The heats of formation are given in the table below. In molar quantities, assume 1 mole of air is (O2+3.76N2). The reactants have a temperature of 25°C before combustion. You may use the average values of the specific heats for each constituent. C. Would the adiabatic flame temperature be lower or higher for a rocket engine that uses pure oxygen instead of air? Explain. Constituent Qf kJ/kmol @ 298 K Cp kJ/kmol K CH19 9,358 CO2 (g) -393,522 51.9 O2 (g) 0 34.0 N2 (g) 0 31.6 H₂0 (g) -241.827 40.6arrow_forwardNot yet answered Question 1 Marked out of 1.00 A sample of coal fuel has the following ultimate analysis, percent by mass: H2 = 5.6% ; C = 53.4% ; S = 0.1% ; N2 = 0.1% ; 02 = 37.9% and Ash = 2.9%. This coal will be used as a fuel by burning it with no excess air in a furnace. Determine the HHV of the fuel in KJ/kgarrow_forward
- 1. Determine the theoretical weight of air needed in kgair/kgfuel if the fuel used has 40.3°API. 2. A petrol has the following analysis: 85.5% carbon, 14.4% hydrogen, and 0.10% sulfur. Calculate the volume of air in m³ at 1.0 bar and 15°C required for perfect combustion of 1 kg of the fuel. 3. A typical industrial fuel oil, C16H32, is burned with 20% excess air. Calculate the actual weight of air in kgair/sec needed for 3.2 kg per sec of fuel. 4. A logging firm in Isabela operates a Diesel Electric plant to supply its electric energy requirements. During a 24-hour period, the plant consumed 350 gallons of fuel at 80 deg.F and produces 2700 kW-hrs. Industrial fuel used is 30°API and was purchased at P3.00 per liter at 60 deg.F. Determine the overall efficiency of the plant. 5. A diesel engine consumed 945 liters of fuel per day at 30°C. If the fuel was purchased at 15.5°C and 30°API at Php5.00/liter, determine the cost of fuel to operate the engine per dayarrow_forwardDetermine the actual air-fuel ratio of Butane (C4H10) with 200% stoichiometric air (100% excess air). Round-off your answer to two (2) decimal places.arrow_forwardWhat are the NCV and GCV?arrow_forward
- For complete combustion of octane (C3H,3) with 100% dry air. (a) write the balance mol equation (b) calculate the specific heat, enthalpy and internal energy of dry flue gas at 373 K. From Table A-1 specific heats in kJ/kg K: for CO2, Cp = 0.8452 ; for N2, Cp = 1.0414arrow_forwardThe heat of combustion of H2(g) to form H2O(l) under constant-pressure conditions is -285.83 kJ/mol at 25°C. If the water is formed at 1 bar and has a density of 1000 kg/m³, calculate the change in internal energy for this reactionA. -187 kJ/molB. -210 kJ/molC. -282 kJ/molD. -310 kJ/molarrow_forwardA fuel has the following constituents: carbon 85%, hyrdogen 13%, oxygen 2%. When burning this fuel in a boiler furnace the air supply is 50% in excess. Calculate the actual air-fuel ratio.arrow_forward
- The exhaust gas analysis of an engine using octane as fuel gives equal values of CO, and unused O. Computer actual and stolchlometric air-fuel ratio. For equivalence ratio of 1. Calculate (1) The volume of mixture per kg of fuel at pressure of 100 kPa and temp 70°C.. () The volume of combustion products per kg of fuel when temp, of products is 127 c at 1 bar.arrow_forwardThe exhaust gas analysis of an engine using octane as fuel gives equal volumes of CO, and unused O, Computer actual and stoichiometric air-fuel ratio. For equivalence ratio of 1. Calculate The volume of mixture per kg of fuel at pressure of 100 kPa and temp 70°C., (i) The volume of combustion products per kg of fuel when femp. of products is127°C at 1 bar.arrow_forwardWhat is the air-fuel ratio (mass basis) at 200 % excess air?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY
Elements Of Electromagnetics
Mechanical Engineering
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:9780134319650
Author:Russell C. Hibbeler
Publisher:PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:9781259822674
Author:Yunus A. Cengel Dr., Michael A. Boles
Publisher:McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:9781118170519
Author:Norman S. Nise
Publisher:WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:9781118807330
Author:James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:WILEY
Extent of Reaction; Author: LearnChemE;https://www.youtube.com/watch?v=__stMf3OLP4;License: Standard Youtube License