Air cooled heat exchanger

        Air cooler referred to as air cooler, air as a coolant, can be used as a cooler, can also be used as a condenser. The air cooler is mainly composed of tube bundle, support and fan. Air cooler The hot fluid flows in the tube and the air blows through the tube bundle. Because the amount of ventilation required for heat transfer is large, and the wind pressure is not high, axial flow fans are often used (see fluid conveying machinery). The type and material of tube bundle have great influence on the performance of air cooler. Because the heat transfer coefficient of the air side is very small, the tube is often added with fins to increase the heat transfer area and fluid turbulence, and reduce the thermal resistance. Most air coolers use radial fins. The air cooler usually uses a light tube with an outer diameter of 25mm, a low fin tube with a fin height of 12.5mm and a high fin tube with a fin height of 16mm. The fins are generally made of a material with a high thermal conductivity (most commonly aluminum) and are wound or set onto the light tube. In order to strengthen the heat transfer effect of the air cooler, it can be humidified by spraying water in the inlet air. This not only reduces the air temperature, but also increases the heat transfer coefficient. The use of air coolers can save a lot of industrial water, reduce environmental pollution, and reduce infrastructure costs. Especially in water-scarce areas, air cooling instead of water cooling can alleviate the contradiction of water shortage.