When selecting and designing a closed cooling tower, natural temperatures such as local wet bulb temperature and ambient temperature are considered. These temperatures have a certain impact on the refrigeration of closed cooling towers. The temperature difference between the south and north of China is relatively large, so the cooling capacity of cooling towers will be designed differently according to the environmental temperature in different regions.
For example, in northern China, winter temperatures can reach minus 30 ° C. Of course, the lower the ambient temperature, the better the cooling efficiency of closed cooling towers. Normally, in a closed cooling tower, the temperature of the circulating cooling medium in the cooling coils is constant because it is based on the temperature of industrial production. When passing through the cooling coil, heat is exchanged with the cold air through the coil, and the cold air absorbs the heat to be carried away by the fan. Of course, the amount of heat carried away by air at minus 30 ° C and air at 0 ° C seems to be different. The lower the temperature, the more heat the air can absorb, and the faster the cooling efficiency of the closed cooling tower, the lower the cooling consumption.
When designing a closed cooling tower, the spray system is usually automatically activated based on temperature. This takes into account that the ambient temperature may change. When the temperature is relatively high and relying on air heat exchange for cooling does not meet the actual requirements, the spray water will be automatically turned on to assist in cooling, and the water will evaporate and absorb heat to cool down. If the ambient temperature is relatively low, the cooling effect can be fully achieved without opening the spray, which also reduces the power consumption of the closed cooling tower to a certain extent.
If the temperature is relatively low, relying on continuous coil natural cooling may also achieve the purpose of cooling. In the consideration of this environmental temperature, according to usual, the cooling temperature is generally equivalent to the local wet bulb temperature, and slightly higher than the wet bulb temperature. The temperature in the south of our country is generally high, so when designing cooling towers, it is best to consider slightly increasing the cooling capacity to ensure cooling efficiency and capacity.
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