Double circulation principle of closed cooling tower
The cooling principle of closed cooling tower involves two cycles: internal circulation and external circulation. Its core component is the copper tube surface cooler, which does not require filler.

① Internal circulation: This cycle is connected to the target equipment to form a closed circulation system in which the circulating medium is soft water. Its main task is to cool the target equipment and discharge the heat in the equipment through the cooling unit.

② External circulation: This cycle is designed for the cooling tower itself and does not come into direct contact with the internal circulation water. It only exchanges heat and dissipates heat through the copper tube surface cooler to reduce the temperature of the cooling tower. In this cycle, the motor operation is automatically controlled by the water temperature.

In spring and summer, when the ambient temperature is high, the two cycles usually need to run at the same time. In autumn and winter, due to the low ambient temperature, in most cases, only the internal circulation needs to be started to meet the needs.
Cooling tower type: closed cooling tower
Closed cooling tower, as a highly efficient cooling equipment, is widely used in many industrial fields. Its unique design and operating principle enable it to perform excellent cooling effects in different seasons and environments. At the turn of spring and summer, when the ambient temperature gradually rises, the dual circulation system of the closed cooling tower begins to work together to ensure the stable operation of the equipment; and in autumn and winter, as the ambient temperature drops, the internal circulation is sufficient to meet the cooling needs, and the external circulation can be dormant in time to save energy.
Detailed introduction of closed cooling tower
The closed cooling tower, also known as a closed cooling tower or a closed tower, can be traced back to the evaporative cooler. This cooling tower cleverly combines the advantages of water-cooled coolers and conventional cooling towers to form a unique and efficient heat exchanger. It has the characteristics of both water coolers and air coolers, so some manufacturers also call it “evaporative air cooler”. At present, there are many types of such cooling equipment on the market, but their common feature is that they spray water on the outside of the partition heat exchanger and promote heat exchange through forced ventilation. In this process, heat energy is transferred from the cooled fluid in the partition heat exchanger through the wall to the spray water outside the wall, and then transferred to the air by forced convection between the spray water and the air. It is worth noting that since the cooled fluid forms a closed loop with the external process equipment in the partition heat exchanger, it is different from the general cooling tower directly exposed to the air. This is why it is called a “closed tower”, while those general cooling towers are correspondingly called “open towers”.