Closed cooling tower need to consider the problem of anti-freezing .
1. If the closed cooling tower does not need to be operated in winter , the spray water and internal circulating water must be drained in the winter when it is basically not used . It is recommened to use compressed air to force the internal circulating water with a pressure greater than 4 kg , and it is not recommended to use carbon steel tube heat exchangers for drainage .
2. Anti-freezing operation in part time .
The antifreeze problem of the spray water system usually adds an electric heater to the water tray , which uaually turns on when the spray water is below 5 degrees Celsius and stops above 8 degrees Celsius . The temperature probe transmits the signal to the control cabinet and antomatically controls 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 external temperature .
3. Frost protection for year-round operation .
