Most cooling towers are of the “open” type. It is also called the wet design and is found at the top of most commercial buildings and industrial plants. Damp or open cooling towers offer a very efficient way to expel heat from a cooling system. It is called a wet system because it sprays water to cool the filled packaging. The resulting design also allows some evaporation, which carries the heat away from the cooling system. According to water treatment expert Superior Water Conditioners, to keep the system operating efficiently, a chemical-free cooling tower can be used to clean the water recirculating inside the system.
An open cooling tower pumps water to carry heat from the basement to the chiller on the roof. The water gets heated further before the heat is ejected into the atmosphere. As the water recirculates, some of it evaporates and escapes through the system. This slowly lessens the amount of water. Also, with the repeated cycling of the water, it slowly collects dissolved minerals as well as organic debris, like leaves and feathers. Cooling towers have a self-cleaning mechanism, but as the water keeps going through the system, it also helps deposit minerals in the pipes, creating scales. Scales and corrosion are hard to prevent.
Automated Clean Up and Water Refill
There is a minimum amount of water in the cooling tower basin. Water is lost from the system through either evaporation or when the cooling tower drains to rid itself of accumulated dirt and salt. On the other hand, if the water in the basin is too high, it goes to the overflow and out through the drain. Water is drained from the cooling tower during normal operations as well as during maintenance work. During normal operations, water is removed when the sensors detect that the water impurities are too high. This process is called a blowdown.
Impurities are already in the water and the air, and when water evaporates, it leaves the impurities and dirt behind. The pollutants accumulate with succeeding blowdowns. This can then damage the cooling tower and cause undue stress to the workers.