The difference between open cooling tower and closed cooling tower-Wuxi Ark Fluid Technology Co., Ltd

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The difference between open cooling tower and closed cooling tower

Release time：

2022-11-30

Comparison between open cooling tower and closed cooling tower: the structure of the design scheme is different, the cooling water method is different, the materials are different, and the energy consumption is different
The basic principle of heat removal of the open cooling tower is to pour the cooling circulating water onto the PVC filler in the form of a spray, conduct heat transfer by using the interaction between water and gas, and blow the cyclone circulation system of the tower body with a centrifugal fan to expel the heat flow after heat transfer with water, so as to achieve heat removal. This kind of refrigeration method has less capital investment in the early stage, but the working capital is very high (water consumption, energy consumption).
The basic principle of heat removal of closed cooling tower is summarized as two circulation systems: one internal circulation and one external circulation. There is no filler, and an important part is the copper tube surface refrigerator.
Automobile internal circulation: it is connected with the target equipment to produce a closed management system of the circulation system (the substance of the circulation system is softened water). Carry out refrigeration for the target equipment, and take the waste heat recovery of the target equipment out of the refrigeration generator set.
External circulation: in the cooling tower, heat is discharged for the cooling tower itself. It does not interact with the internal cooling circulating water, and only uses the copper tube surface cooler in the cooling tower for heat transfer and refrigeration. In this kind of refrigeration mode, the automatic control system is used to adjust the operation of the motor according to the temperature. Two circulation systems must be operated separately when the working temperature is high in spring and summer. In autumn and winter, the working temperature is low, and in most cases, only one car internal cycle is needed.
Water consumption comparison: the open cooling tower is in direct contact with gas, so the annual rainfall of water is relatively large. The circulating system of cooling circulating water lasts for a day, and the water exposed by the cooling tower has a certain temperature. Therefore, the working temperature of open cooling tower is relatively high, so the annual rainfall of water will be more volatile than that in the geographical environment. According to the current general calculation method, the water consumption of open cooling tower is 100 times higher than that of closed cooling tower. The water consumption of closed cooling tower can be reasonably controlled at 0.01%, and that of open cooling tower at about 1%. Comparison of power consumption: the water pump head of open cooling tower is lower than that of closed cooling tower, and the closed cooling tower must also be designed with automatic spraying system, boiler auxiliaries and other machinery and equipment. Therefore, the application output power of machinery and equipment can be improved at a certain level, which will lead to excessive power consumption. The automatic spraying of closed cooling tower and the auxiliary boiler are not always opened as the refrigeration stage. They are opened when the temperature is high, and the auxiliary desuperheating will be automatically terminated when the temperature drops. Therefore, the power consumption for lifting the closed cooling tower is not very different from that of the cooling tower at the beginning.

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