Märgjahuteid

Märgjahuteid, also known as wet cooling towers, are heat rejection devices that use evaporation to transfer heat from a process fluid to the atmosphere. This is achieved by bringing a cooling medium, typically water, into direct or indirect contact with the process fluid. In a direct contact märgjahuti, the hot process fluid is sprayed into a stream of cooler air, causing some of the fluid to evaporate. This evaporation absorbs heat, thus cooling the remaining fluid. In an indirect contact märgjahuti, the process fluid circulates through tubes that are cooled by water sprayed over them. Again, evaporation of the cooling water removes heat.

The cooled process fluid is then recirculated back to the heat source. The evaporated water is replaced by a makeup water supply, and the remaining water, which has absorbed impurities, is often discharged as blowdown to prevent excessive concentration of dissolved solids. Märgjahuteid are commonly used in industrial applications such as power plants, chemical processing, and HVAC systems where large amounts of heat need to be dissipated efficiently. Their effectiveness is dependent on ambient humidity and temperature, as higher humidity reduces the rate of evaporation and thus cooling capacity. They are generally more energy-efficient than dry cooling systems for comparable cooling loads, but they do consume water and require ongoing maintenance to manage water quality and prevent biological growth.