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The main factors affecting the heat transfer effect of closed cooling tower and the solutions to the continuous rise of water temperature

The main factors affecting the heat transfer effect of closed cooling tower and the solutions to the continuous rise of water temperature

1. The solution to the continuous rise of water temperature in the closed cooling tower


Water in cooling towers usually relies on natural heat dissipation, so the volume and surface area of the cooling tower should be large enough. If the ambient temperature is too high, for example, when it exceeds 40°C, the temperature of the cooling water in the cooling tower will be higher, thereby reducing the heat exchange capacity and preventing the coupling oil temperature from being cooled. In order to ensure the thermal balance of the coupling, the cooling tower can be supplemented with cold water continuously or intermittently. Second, because there are no dead spots in the spiral channel, impurities are easily washed away. In order to save water, some units have installed thermal valves on the water inlet pipes of the cooling towers. When the cooling water temperature reaches the limit, the operation and production practice of the thermal valve proves that the spiral plate heat exchanger is not easy to block, especially the suspended particle impurities such as sediment and small shells are not easy to deposit in the spiral channel, analyze the reason, open the inlet Water outlet, add cold water with lower temperature into the cooling tower, when the water temperature reaches the required level, the thermal valve is closed, and the water supply stops, so that the cooling water in the cooling tower can always be guaranteed not to be higher than the set temperature.


2. The main factors affecting the heat transfer effect of the closed cooling tower


In a closed-circuit cooling tower, water forms a water film or droplets in the fill, and heat and mass transfer occur during direct contact with air. Heat transfer is due to the temperature difference between water and air, while mass transfer is due to the evaporation of water vapor from the water surface into the air, thereby transferring the latent heat of water evaporation to the air. In the process of heat and mass transfer, the process of water cooling is called evaporative cooling, so the heat dissipated by water in the process of evaporative cooling consists of two parts, namely, contact heat dissipation (conduction and convection) and evaporative heat dissipation. The purpose of using a cooling tower is to achieve the cooling effect, which mainly depends on the cooling fins, fan air volume, cooling tower water, good ventilation conditions and installation location.


(1) Radiator


It is a key component of cooling towers. The small tower is usually made of PVC sheet through heat pressing or heat absorption. The tower will be made of wood. The main purpose is to make the air and water contact surface as large as possible without affecting the wind resistance. At the same time, the heat exchange rate will also be achieved. The two parameters that affect the heat transfer effect of the radiator are mainly the shape and height of the radiator. When installing the water tower, try not to damage the radiator to prevent the radiator from flowing smoothly.


(2) Fan air volume


It mainly speeds up the airflow in the tower, accelerates the heat exchange between air and water, and takes away heat. The main factors affecting the air volume of the fan are the shape of the fan blade, that is, the width and length of the electronic fan blade and its own deflection angle, the speed of the fan blade, the installation angle, the speed, the motor and the transmission ratio, etc. In addition, under the condition of air volume, the cooling effect of the same type of closed cooling tower with a small cooling water volume is better than that of a tower with a large cooling water volume. The structure and performance of the rotating plate heat exchanger belongs to the heat exchange equipment system. There is no space between water and air. Water and air are the two media of heat exchange. The cooling tower uses air to cool the water passing through it, and its heat transfer The characteristic is that the heat transfer from water to air does not need to pass through the wall, but is carried out in a direct contact process, and the spiral plate heat exchanger has obvious advantages in heat dissipation.

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