The main parameters affecting the selection of closed cooling towers are as follows:

Cooling water quantity Q (m / h): When selecting a cooling tower, the calculated cooling water quantity must be multiplied by an appropriate (usually 1.1 ~ 1.3) coefficient.

Inlet water temperature t (℃): Standard design conditions for civil cooling towers are: inlet water temperature 37 ℃, outlet water 32 ℃, temperature difference between inlet and outlet water is 5 ℃; industrial cooling tower design conditions are generally 65 ℃ ~ 45 ℃, 43 ℃ ~ 33 ℃, 40 ℃ ~ 32 ℃, etc., the temperature difference between the inlet and outlet towers can reach 8 ℃ -20 ℃.

Outlet water temperature t (° C): The difference between the temperature of the cooling tower inlet water and the outlet water temperature is generally called the cooling range, which mainly depends on the wet bulb temperature of the surrounding air. The cooling water effectiveness of a cooling tower is measured by the difference between the temperature of the effluent and the temperature of the wet bulb, or a close value. Therefore, changes in the local wet bulb temperature directly affect the cooling effect of the cooling tower.

Wet bulb temperature o (° C): Wet the gauze on the thermometer with wet gauze, and immerse the lower end of the gauze in a water-filled container to become a wet bulb thermometer. Place the wet bulb thermometer in a ventilated place to allow continuous air circulation. At this time, the thermometer reads the wet bulb temperature.

Dry bulb temperature 0 (℃): The dry bulb temperature is the temperature measured by hanging a thermometer outdoors or indoors. The influence of dry bulb temperature on cooling tower is relatively large, because dry bulb temperature affects wet bulb temperature. The combination of the two can represent the temperature and humidity of the air.