Thermodynamics: An Engineering Approach ( 9th International Edition ) ISBN:9781260092684
9th Edition
ISBN: 9781260048667
Author: Yunus A. Cengel Dr.; Michael A. Boles
Publisher: McGraw-Hill Education
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Chapter 15.7, Problem 57P
(a)
To determine
The air-fuel ratio.
(b)
To determine
The rate of heat transfer from the combustion chamber.
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Chapter 15 Solutions
Thermodynamics: An Engineering Approach ( 9th International Edition ) ISBN:9781260092684
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...
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- n-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_forwardAcetylene gas (C2H2) is completely burned with 20 percent excess air in the steady-current combustion process. Fuel and the air enters the combustion chamber at 25 ° C and the products exit at a temperature of 1227 ° C. During this process Calculate the heat transfer that occurs.arrow_forwardThe 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_forward
- 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 -201.17 238.58 208.45 249.35arrow_forwardLiquid propane (C 3 H 8 ) enters a combustion chamber at 25 °C at a rate of 0.05 kg/min where it is mixed and burned with theoretical air that enters the combustion chamber at 7 °C. an analysis of combustion gases reveals that all the hydrogen in the fuel burns to H 2 O but only but only 90% of carbon burn to CO 2 with the remaining 10% forming Co if the exit temperature of combustion gases is 1500 K (a) the mass flow rate of air and (b) the rate of heat transfer from the combustion chamberarrow_forwardFor 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_forward
- H.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_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_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
- Calculate the enthalpy of combustion of propane C3H8 at 25 oC in both kJ/kg and kJ/mole under the following conditions:- 1- gaseous propane with H2O liquid in the products. 2- gaseous propane with H2O vapor in the products 3- liquid propane with H2O liquid in the products 4- liquid propane with H2O vapor in the products note: the enthalpy of evaporation of propane at 25 oC is 425 kJ/kgarrow_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_forwardA 10% rich mixture of Heptane (C,H16) and air is initially at a pressure of 1 bar and temperature of 100°C, and is polytropically compressed through a volumetric ratio of 6 to 1. It is ignited and adiabatic combustion proceeds at constant volume. The maximum temperature reached is 2627°C and at this temperature the equilibrium constants are PH₂OPCO = 6.72 PCO₂PH₂ P²coPo₂ = 0.054 Pco2po ' = 1bar is a reference pressure for the equilibrium constants. if the constituents of the gas are CO2, CO, H₂O, H₂, O2 and N₂: (a) Calcuate the reaction equation without dissociation (b) Calculate the equilibrium product composition. (c) Verify that approximately 30.2 % of the carbon has burned incompletely. Notes: the number of moles is not conserved in this reaction! You may use any method to solve the (nonlinear) equations you derive.arrow_forward
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