Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 32, Problem 12RQ
When incomplete combustion occurs, what additional by-products of combustion are created?
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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).
What are the combustion mechanisms used in combustion calculations?
Chapter 32 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 32 - How many grades of fuel oil are normally...Ch. 32 - What two elements make up fuel oil?Ch. 32 - The most common fuel oil used for residential and...Ch. 32 - As the temperature of an oil sample decreases, A....Ch. 32 - If oil is to be stored at temperatures lower than...Ch. 32 - Prob. 6RQCh. 32 - If it is expected that an oil-fired appliance will...Ch. 32 - How many pounds of oxygen are required to burn 1...Ch. 32 - Explain the concept of excess air when it is used...Ch. 32 - Before fuel oil can be burned, it must be A....
Ch. 32 - What products of combustion are produced with...Ch. 32 - When incomplete combustion occurs, what additional...Ch. 32 - The minimum nozzle pressure for residential and...Ch. 32 - Prob. 14RQCh. 32 - Describe the three functions of the oil burner...Ch. 32 - Describe three common spray patterns for an oil...Ch. 32 - The purpose of the electrodes of an oil burner is...Ch. 32 - Prob. 18RQCh. 32 - Prob. 19RQCh. 32 - List the advantages a solid-state igniter has over...Ch. 32 - Which of the following is the typical output...Ch. 32 - Prob. 22RQCh. 32 - Prob. 23RQCh. 32 - Prob. 24RQCh. 32 - Explain the difference between the hot contacts...Ch. 32 - The purpose of the cad cell in an oil burner...Ch. 32 - Explain why it is important to keep the cad cell...Ch. 32 - A one-pipe system may be used when the oil tank is...Ch. 32 - Prob. 29RQCh. 32 - Prob. 30RQCh. 32 - The oil flame must not hit the combustion chamber...Ch. 32 - Describe the purpose of the heat exchanger.Ch. 32 - When servicing an oil burner, a service technician...Ch. 32 - Describe the function of the flame-retention ring...
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- 1 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_forwardHow do you account for the existence of both complete and incomplete combustion? Explain.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_forward
- This 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_forwardDifferentiate complete combustion from incomplete combustion.arrow_forwardPARTS A & B ( Justify correctly) Gaseous ethane C2H6 is burned at constant pressure P = 1atm. The reagents enter the reaction at 25°C, and the products are at 727°C. Determine the heat released by the system for ethane combustion with PART (a) the theoretical stechiometric amount of oxygen PART (b) the theoretical amount of air (air contains 3.76 kmol of nitrogen per 1 kmol of oxygen). In which case is the heat released by the system larger? Explain .arrow_forward
- 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_forwardB// Hexane (C6H14) is burned with atmospheric air. The analysis of the products on a 'dry' basis is as follows: CO₂ = 10.00%, O₂ = 2.37%, CO = 0.53%. (i) Determine the combustion equation; (ii) Calculate the air-fuel ratio; (iii) Percent theoretical air.arrow_forwardMethanol (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_forward
- A hydrocarbon with an unknown composition (CxHy) is burned in dry air. The products are 9.6%CO2, 7.3%O2 and 83.1%N2. Determine the x/y ratio and the percentage theoretical air used.arrow_forwardAcetylene (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?arrow_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_forward
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