Cooling Towers

While small air conditioners are good for domestic purposes, and several heavy duty split models are sufficient for showrooms and office complexes, they lack the ability to chill a large volume of hot air, such as those found in industries. In such circumstances, one requires a cooling unit that can chill a large volume of hot air quickly. The best way to achieve this goal is through industrial cooling towers. Before proceeding further, let us understand what this device is and how it is used. In simple language, such units extract heat from the water via evaporation. This permits a small volume of water to be cooled, and then allowed to evaporate by passing it through a moving air stream to permit a cooling source to the remaining stream of water. These towers are available in two different types... closed and open. The latter type is also known as "direct cooling towers." These models permit water to get into contact with the outside air. The water that has been cooled will eventually be returned. However, since a lot of the water will have been evaporated, additional water needs to be introduced to compensate the water that has been lost. Such towers also have a filtration unit whose task is to prevent pollution from outside from entering into the water, keeping it clean.

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The closed version

The other type of industrial cooling tower, the closed one, is also referred to as "indirect cooling tower." It functions in a manner that is opposite to that of the open model. This model does not allow anything that is outside of the tower to come in direct contact with the water, by adding heat exchangers to it. The hot water that needs to be cooled passes through this heat exchanger, with the tower that is adjacent to the water that needs to be chilled. The advantage of this system is that no external substances pollute the water, keeping the water clean. Many factors affect the efficiency of such towers, the primary one being the loss of water through evaporation. However, one cannot avoid this, as evaporation is necessary to ensure that the cooling process works. Overflow too is a factor that affects the efficiency of cooling towers. This happens when the water level inside the tower rises above a pre set level. Windage or splash out takes place when water is lost by splashing inside the tower. Caused due to wind, this affects the efficiency of the tower.