白小姐四肖必选期期中

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FRP cooling tower



A "cooling tower" is a device that cools water. Water exchanges heat and mass with the air flowing through it, causing the water temperature to drop.

Open cooling tower is a device that uses the contact of water and air to dissipate waste heat generated in industry or refrigeration and air conditioning through evaporation. The basic principle is: dry (low enthalpy) air is drawn by the fan and then enters the cooling tower from the air inlet network; high-temperature water molecules with high saturated steam partial pressure flow to the air with low pressure, damp heat (high enthalpy) The water was sprinkled into the tower from the watering system. When water droplets come into contact with air, on the one hand, due to the direct heat transfer between air and water, on the other hand, due to the pressure difference between the surface of water vapor and air, evaporation occurs under the effect of pressure, that is, by contacting with unsaturated dry air The heat transfer takes away the sensible heat of the water, and part of the water evaporates away the latent heat in the water, thereby achieving the purpose of cooling the cooling water.

The closed cooling tower uses water to contact the coil, and takes away the heat of the cooling working medium in the coil through the heat transfer heat transfer of the tube wall to reach the cooling target. The circulating water in the closed cooling tower is only circulated inside the cooling tower to exchange heat with the air for cooling and then contact the coil to take away the heat of the working medium in the coil. The supplementary water pipe is properly replenished. Compared with the open cooling tower, the closed cooling tower is the most The obvious feature is the increase of coils. The liquid working fluid that needs to be cooled flows in the steel coils without direct contact with water, and heat is transferred through the tube walls.

Waste heat generated during industrial production or refrigeration processes is generally conducted with cooling water. The role of the cooling tower is to exchange cooling water with waste heat in the tower and air, so that the waste heat is transmitted to the air and dispersed into the atmosphere. For example, in a thermal power plant, the boiler heats the water into high-temperature and high-pressure steam, pushes the turbine to do work to generate electricity from the generator, and the exhaust steam after the work of the turbine is discharged into the condenser, which is heat-exchanged with cooling water to condense into water, and then pumped with water Return to the boiler for recycling. In this process, the waste heat of the exhaust steam is transferred to the cooling water, which raises the temperature of the water. The cooling water with the waste heat is transferred to the air in the cooling tower and discharged into the atmosphere from the wind tube. Application scope of cooling towers: mainly used in air-conditioning cooling systems, refrigeration series, injection molding, tanning, foaming, power generation, steam turbines, aluminum profile processing, air compressors, industrial water cooling and other fields. The most widely used are air-conditioning cooling, freezing, Plastic chemical industry.


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