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Which one of the following modes of heat transfer would take placepredominantly, from boiler furnace to water wall?
- a)Convection
- b)Conduction
- c)Radiation
- d)Conduction and convection
Correct answer is option 'C'. Can you explain this answer?
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Which one of the following modes of heat transfer would take placepred...
Ans. (c) In boiler, the energy from flame is transmitted mainly by radiation to water wall and radiant super heater.
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Which one of the following modes of heat transfer would take placepred...
Heat transfer from boiler furnace to water wall predominantly occurs through radiation. This is due to the higher temperature of the furnace relative to the water wall, resulting in the emission of thermal radiation.
Explanation:
Radiation is the transfer of energy through electromagnetic waves, which can travel through a vacuum. In a boiler furnace, the combustion of fuel results in high temperatures, typically exceeding 1000°C. These high temperatures cause the emission of thermal radiation, which is absorbed by the cooler surfaces of the water wall. As a result, the water wall heats up, and the water inside it is also heated, resulting in steam generation.
Conduction and convection can also play a role in heat transfer from the furnace to the water wall, but they are less significant compared to radiation. Conduction is the transfer of heat through a material, while convection is the transfer of heat through a fluid (such as air or water) due to the movement of the fluid. In a boiler, conduction can occur between the furnace and the water wall through the metal structure of the boiler. Convection can also occur as the hot gases from the furnace flow over the water wall, transferring heat to the water through convection.
In summary, while all three modes of heat transfer (conduction, convection, and radiation) can occur in a boiler, radiation is the dominant mode of heat transfer from the furnace to the water wall due to the high temperature difference between the two surfaces.
Explanation:
Radiation is the transfer of energy through electromagnetic waves, which can travel through a vacuum. In a boiler furnace, the combustion of fuel results in high temperatures, typically exceeding 1000°C. These high temperatures cause the emission of thermal radiation, which is absorbed by the cooler surfaces of the water wall. As a result, the water wall heats up, and the water inside it is also heated, resulting in steam generation.
Conduction and convection can also play a role in heat transfer from the furnace to the water wall, but they are less significant compared to radiation. Conduction is the transfer of heat through a material, while convection is the transfer of heat through a fluid (such as air or water) due to the movement of the fluid. In a boiler, conduction can occur between the furnace and the water wall through the metal structure of the boiler. Convection can also occur as the hot gases from the furnace flow over the water wall, transferring heat to the water through convection.
In summary, while all three modes of heat transfer (conduction, convection, and radiation) can occur in a boiler, radiation is the dominant mode of heat transfer from the furnace to the water wall due to the high temperature difference between the two surfaces.
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Which one of the following modes of heat transfer would take placepred...
All modes of heat transfer would be seen here, but most dominant would be radiation because in radiation the transfer of heat between two surfaces is proportional to {t^(4)boiler furnace temp -t^(4)water temp}. hence this difference would be huge as compared to cond and conv. hence, radiation would b dominant.
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Which one of the following modes of heat transfer would take placepredominantly, from boiler furnace to water wall?a)Convectionb)Conductionc)Radiationd)Conduction and convectionCorrect answer is option 'C'. Can you explain this answer?
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