Freeze Protection of Closed Cooling Towers

Yunuo Cooling Technology introduces the antifreeze of closed cooling towers to you.

Closed cooling tower, referred to as closed cooling tower, (also called evaporative air cooler, closed cooling tower) places the tubular heat exchanger in the tower, through the heat exchange of circulating air, spray water and circulating water to ensure Cooling effect. Because it is a closed cycle, it can ensure that the water quality is not polluted, well protect the operation of the main equipment, and improve the service life. The closed cooling tower originated from the evaporative cooler, which began in the middle of the last century, and gradually began to be used with the development of the chemical, metallurgical, and electronic industries. In the 1980s, when it was discovered that the catastrophic climate that posed a huge threat to human existence was related to the air-conditioning and refrigeration industry, passive cooling technologies such as evaporative cooling technology, which used natural conditions to obtain cooling capacity, developed rapidly. The closed cooling tower originated from the evaporative cooler, which began in the middle of the last century, and gradually began to be used with the development of the chemical, metallurgical, and electronic industries. For evaporative cooling technology, as early as 250 BC, the ancient Egyptians already knew how to use water evaporation for cooling.

In the last century, various countries have also carried out many aspects of research on evaporative cooling technology. In the 1970s, the emergence of the energy crisis made the application of evaporative cooling technology gradually paid attention. The American ASHRAE has established a technical committee called "evaporative cooling", which aims to promote the application of evaporative cooling technology, collect and publish data on the application, installation, operation and maintenance of evaporative cooling systems, publish specifications and standards, and affirm and reward Research on evaporative cooling, in order to promote the application of evaporative cooling equipment in the whole country. Antifreeze measures for occasions that are basically not used in winter If the closed cooling tower does not need to be operated in winter, the spray water and internal circulating water must be drained when it is shut down. The cooling tower adopts a three-dimensional inclined structure in the design of the heat exchanger to ensure smooth flow of water and clean emptying. The top of the heat exchanger is provided with an air valve structure, and compressed air can be introduced to assist in emptying if necessary. Antifreeze problem in occasions running in some time periods

The antifreeze of the closed cooling tower has two parts: the spray water system and the internal circulating water system (softened water). For the antifreeze problem of the spray water system, an electric heater is usually added in the water sump, which is generally turned on when the spray water is lower than 5 ℃, and stopped when the temperature is above 8 ℃. The temperature probe transmits the signal to the control cabinet to automatically control the start and stop of the electric heater. The power selection of the electric heater is determined according to the circulating water volume and the outside air temperature.

For the antifreeze of the internal circulating water system, ethylene glycol solution can be added or electric heating equipment can be added. The formula of ethylene glycol solution can be consulted by our company. For larger cooling systems, it is possible to consider digging a pool to pour the spray water into it, which can save electricity costs due to electric heating operation, and can also put medicines in the pool to improve the quality of the spray water.

If the closed cooling tower is equipped with an electronic control system, the number of cooling towers may change due to the load change of the main system, so the problem of antifreeze should also be considered. With the continuous development of science and technology, closed cooling towers will inevitably usher in greater development and application space.

The above is the relevant content introduced by Uno Cooling Technology.