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For maximum discharge of hot gases through the chimney, the height of hot-gas column producing draught is
- a)twice the height of chimney
- b)three times the height of chimney
- c)half the height of chimney
- d)equal to the height of chimney
Correct answer is option 'D'. Can you explain this answer?
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For maximum discharge of hot gases through the chimney, the height of ...
Explanation:
To understand why the height of the hot-gas column producing draught is equal to the height of the chimney, we need to understand the concept of draught and the factors affecting it.
Draught:
Draught is the flow of air or gas through a chimney or flue. It is necessary to maintain a proper draught in order to ensure the efficient combustion of fuel and the removal of combustion products.
Factors affecting draught:
There are three main factors that affect the draught in a chimney:
1. Height of the chimney
2. Temperature of the flue gases
3. Density of the flue gases
Height of the chimney:
The height of the chimney plays a crucial role in creating draught. The draught is created due to the difference in pressure between the top and bottom of the chimney. As the hot gases rise, they create a low-pressure area at the top of the chimney, which in turn creates a higher pressure at the bottom. This pressure difference results in the flow of gases through the chimney.
Hot-gas column:
The height of the hot-gas column is the vertical distance from the point of combustion to the top of the chimney. The hot-gas column is responsible for generating the necessary pressure difference to create draught.
Maximum discharge of hot gases:
To achieve the maximum discharge of hot gases through the chimney, the hot-gas column should be as high as possible. This is because a higher hot-gas column will create a greater pressure difference, resulting in a stronger draught.
Equal height of hot-gas column and chimney:
When the height of the hot-gas column is equal to the height of the chimney, the pressure difference created is maximized. This is because the entire height of the chimney is utilized to generate the pressure difference.
Conclusion:
In conclusion, the height of the hot-gas column producing draught is equal to the height of the chimney in order to achieve maximum discharge of hot gases. This ensures that the pressure difference is maximized, resulting in an efficient flow of gases through the chimney.
To understand why the height of the hot-gas column producing draught is equal to the height of the chimney, we need to understand the concept of draught and the factors affecting it.
Draught:
Draught is the flow of air or gas through a chimney or flue. It is necessary to maintain a proper draught in order to ensure the efficient combustion of fuel and the removal of combustion products.
Factors affecting draught:
There are three main factors that affect the draught in a chimney:
1. Height of the chimney
2. Temperature of the flue gases
3. Density of the flue gases
Height of the chimney:
The height of the chimney plays a crucial role in creating draught. The draught is created due to the difference in pressure between the top and bottom of the chimney. As the hot gases rise, they create a low-pressure area at the top of the chimney, which in turn creates a higher pressure at the bottom. This pressure difference results in the flow of gases through the chimney.
Hot-gas column:
The height of the hot-gas column is the vertical distance from the point of combustion to the top of the chimney. The hot-gas column is responsible for generating the necessary pressure difference to create draught.
Maximum discharge of hot gases:
To achieve the maximum discharge of hot gases through the chimney, the hot-gas column should be as high as possible. This is because a higher hot-gas column will create a greater pressure difference, resulting in a stronger draught.
Equal height of hot-gas column and chimney:
When the height of the hot-gas column is equal to the height of the chimney, the pressure difference created is maximized. This is because the entire height of the chimney is utilized to generate the pressure difference.
Conclusion:
In conclusion, the height of the hot-gas column producing draught is equal to the height of the chimney in order to achieve maximum discharge of hot gases. This ensures that the pressure difference is maximized, resulting in an efficient flow of gases through the chimney.
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For maximum discharge of hot gases through the chimney, the height of hot-gas column producing draught isa)twice the height of chimneyb)three times the height of chimneyc)half the height of chimneyd)equal to the height of chimneyCorrect answer is option 'D'. Can you explain this answer?
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