Ventilation is defined as the process by which stale air inside an enclosure is replaced by fresh air from outside.
Therefore it dilutes inside air to prevent ventilation by body odour and removes any contamination in air.
It helps in maintaining the heat balance of the body to prevent discomfort and injury to health of the occupants and also It is necessary for the supply of oxygen for breathing and to prevent undue rise in carbon dioxide content in air.
- Firstly the term ventilation is used as the free passage of clean air in the structure. In other words the removal of all vitiated air from a building and its replacement with fresh air is known as ventilation.
- If the room is not properly ventilated there will be an excessive quantity of carbon dioxide in the air.
- The more the amount of carbon dioxide the more difficult it will be to breathe.
- Therefore it is requires dust control and other impurities in the air.
- The ventilation is also required to suppress odours, smoke, concentration of bacteria etc.
- In order to prevent the formation of conditions leading to suffocation in conference rooms, committee hall etc the proper ventilation of such premises must be made.
Objectives of ventilation:
- It should be so designed that the required quantity of fresh air is admitted in the premises and that the vitiated air is extracted from the premises.
- Firstly one should maintain the value of desired relative humidity.
- One should maintain the effective temperature properly with regard to human comfort.
- The air movements should be uniform and it should be seen that pockets of stagnant air are not formed lastly.
- The incoming air should be free from impurities such as dust , odour etc.
Factors affecting on ventilation:
- Air changes
- Quality of air
- Use of building
There are two types of ventilation
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