FAQ

Why can closed cooling towers save a lot of water?

Author： Views: Time:2025-10-14

　　Closed cooling towers are divided into internal and external circulation systems. It not only has good cooling effect, but also can save a lot of energy consumption. Let's understand how it saves water.

　　How does the internal circulation system save water

　　Internal circulating water (or other cooling medium) circulates in a closed coil, completely isolating the external world, so water does not evaporate or consume. Compared with traditional open cooling towers, it saves a lot of circulating water. Due to the large contact area between water and air during tower operation, the evaporation rate is high and water consumption is severe.

　　How does the external circulation system save water

　　The spray pump of the closed cooling tower draws water from the collection tank and sends it to the upper part of the coil. Water is evenly sprayed onto the surface of the coil through the nozzle, exchanges heat with the tube wall, and is carried out of the tower by a fan. The unevaporated water droplets are returned to the collection tank through the dehydrator and reused. Therefore, closed cooling towers can reuse circulating water and have a high water-saving rate. A closed cooling tower is a closed working environment, so the drift rate is very low.

　　3. Operation mode of closed cooling tower

　　Closed cooling towers have two operating modes, dry and wet, which will be adjusted based on outlet temperature, working conditions, season, and local water resources availability. When the required outlet temperature is relatively low, wet operation can be started, that is, the air cooling+spray system can be turned on. When the required outlet temperature is relatively close to the wet bulb temperature, dry operation can be started, that is, the air cooling system can be turned on. If the sprinkler system is not turned on, it will save a lot of water; In spring and summer, due to high temperatures, it is necessary to turn on air cooling+air cooling. Spray system. In autumn and winter seasons, the temperature is lower, and sometimes only the air cooling system needs to be turned on. In addition, for the relatively water scarce areas in northern China, the advantages of closed cooling towers are even more apparent.

　　Most importantly, during operation, the closed cooling tower is controlled by the power system. The sprinkler system starts and stops at any time according to the outlet temperature, which to some extent reduces water and electricity consumption.

　　When is it better to add refrigerant to a closed cooling tower?

　　When is refrigerant added to a closed cooling tower? When the ambient temperature is about 0 ℃, it is possible to consider adding coolant to the pipeline or circulating water tank to increase the surface temperature of the enclosed cooling tower and prevent icing.

　　Add antifreeze: When the local ambient low temperature dry bulb temperature (air temperature) is -10 ℃ or below, 20-30% of high content antifreeze should be added. Users can actually freeze and freeze. It can be flexibly controlled according to the actual situation.

　　The working fluid (water, oil, or other liquid) of a closed cooling tower flows in the coil, and the outer wall of the coil is wrapped in water spray. The heat transfer of liquid enters the atmosphere through the tube wall, saturated water, and humid steam traveling through the air, as well as the provided hot air fan. When spraying water, the spray temperature decreases, and during the circulation process, it flows in the same direction through the thermal settling of polyvinyl chloride, with a gentle breeze entering the air. The coil mainly relies on the damp heat conduction mode. The important feature of this working principle is to suppress the formation of scale on the outer wall of the coil.

　　The closed cooling tower adopts a fully closed-loop circulation, with no impurities entering and minimal pollution; Closed cooling towers can effectively improve the utilization efficiency of factories, without pools, which can directly reduce land occupation and save space; Small in size, easy to install, move, and layout, with a relatively compact structure.

　　The operation of a closed cooling tower is very convenient, relatively stable, and has a relatively high degree of automation. Low operating costs; Widely used, non corrosive medium heat exchangers can also be directly cooled; Low operating and maintenance costs.

　　Before shutting down (for a long time), dry the water in the cooling tower with compressed air. First, drain the water from the enclosed cooling tower, then fill the exhaust hole with compressed air, and finally discharge the remaining water from the drainage hole.

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