What factors affect the selection of closed cooling towers?

Closed cooling tower because of its own energy saving, high efficiency, environmental protection, flexible and other characteristics, has been recognized and promoted by the market, is one of the important equipment of industrial cooling.
But many people still don't know how to choose the right closed cooling tower? Today, follow the small continent to understand, what factors affect the selection of closed cooling tower?

1. Calorific value of process equipment

This is the basic data source for all selection, how much heat is emitted by the process equipment and how much heat needs to be taken away by the cooling equipment.

The cooling amount is generally expressed by Q, Q = MS △t, where M represents the medium flow rate; S represents the specific heat value of the fluid; △t represents the difference between the inlet and outlet water temperatures. In order to make the closed cooling tower can operate normally, our company stands at the customer's point of view, considering the economy of equipment investment and the stability of use, we will negotiate with customers and technicians whether to leave a margin, and finally determine the size of the equipment.

2. Inlet and outlet water temperature

This is an important parameter for closed cooling tower selection, which will determine the accuracy of the selected equipment. Customers can get it from the equipment manual or the actual measurement on site.

The outlet water temperature depends on the local wet bulb temperature. Because the cooling of water depends on the principle of evaporation and heat dissipation, when the moisture in the air reaches a certain saturation value, the evaporation will become very small and the temperature drop will slow down.

3. Wet bulb temperature of the place of use

The closed cooling tower is cooled by evaporating the water film of the tube shell, absorbing the latent heat of vaporization, and reducing the temperature of the medium fluid inside the heat exchange tube, so the external air parameters have a great influence on the heat exchange effect. The ultimate ideal outlet fluid temperature for a closed cooling tower is the wet bulb temperature at the site.

How to calculate the wet bulb temperature? You can tie the warm bubble of the thermometer with moistened gauze, and dip the lower end of the gauze into a water-filled container to become a wet bulb thermometer. Place the wet bulb thermometer in a ventilated place so that the air is continuously circulated. At this time, the thermometer reading is the wet bulb temperature.

4. Site environment

The cleanliness of the ambient air and the ambient airflow have an impact on the selection of the closed cooling tower. For example, casting workshop, the dust content in the air is high, the air is brought into the cooling tower, the water is brought into the cooling tower to spray water, and then sprayed on the heat exchange tube shell, which accumulates over time, forming thick dirt and affecting the heat dissipation effect. Under normal circumstances, calculated according to the fouling coefficient 0.86, when the actual impact increases, the cooling effect is reduced, which is difficult to meet the requirements of the production process, or after a period of operation, the heat transfer coefficient is reduced, thereby reducing the cooling effect.

Furthermore, due to the influence of heat radiation, in some heat treatment workshops, the cooling tower is arranged beside the high-temperature equipment. The heat radiation of the high-temperature equipment above 1000 ℃ heats up the surrounding air, objects and the outer surface of the cooling tower, thus improving the temperature of the air flowing into the cooling tower, reducing the convective heat transfer coefficient and greatly reducing the cooling effect.

5. Pre-investment

The greater the safety margin, the longer the life cycle; the better the maintenance, the longer the life cycle;

When designing the closed cooling tower of Oasis Ice Peak, it is basically considered according to the 0.86 fouling coefficient. If the customer's site environment is good, maintenance is timely, maintenance is comprehensive, the heat exchange tube shell has less fouling, the fouling coefficient is low, the cooling effect can be guaranteed, and the service life cycle is long. However, if the safety margin is increased at the time of the initial investment, even if the cooling effect is reduced a little, the use requirements can be met and the actual service life cycle can be extended.

6. Management status

In terms of management, the equipment is mainly maintained in time and in place. First, the motor should maintain oil injection in time to ensure normal operation. Second, the spray tank should be cleaned twice a week to reduce scaling. Third, replace antifreeze in time in winter to prevent freezing. Fourth, the internal circulating water should be observed and tested in time to ensure the cleanliness of pure water in summer and the freezing temperature in winter. Five to clean up leaves, dust and sundries at the air inlet grid in time, ensure the smooth flow path.