"Cooling tower" is used to describe direct (open circuit) and indirect (closed circuit) cooling equipment. Although most come up with a "cooling tower as an open direct contact heat sink", an indirect cooling tower, sometimes called a "closed circuit cooling tower", is also a cooling tower.
A direct, or open circuit cooling tower is a means of sealing the inside of the structure by spraying circulating water onto the glass fiber filler. The packing provides a larger contact surface, and the heat exchange effect is achieved through the contact of water and air. A fan drives the air circulation in the tower to bring out the hot air flow after heat exchange with water, so as to achieve cooling. The fill may consist of multiple, mainly vertical, water (fill) or lateral splash elements on which the wet surface spreads, creating a cascade of several layers of thin water droplets (splash) with a large surface area.
Indirect or closed circuit cooling towers do not involve direct contact with air and liquids, usually water or glycol mixtures, to be cooled. The difference is an open cooling tower, which indirectly has two independent fluid circuits. One is that the water in the external circuit is on the second track, which is the external circulation of the tube bundle (closed coil) to which the hot fluid process is cooled and returned in a closed circuit. The air is cascaded by drawing water across the entire heat pipe, providing cooling openings similar to evaporative cooling. The heat flow in operation from the internal fluid circuit, through the coil tube wall, the external circuit, and then is heated by some evaporation of air and water to the atmosphere. The action of indirect cooling towers is therefore very similar, with the exception of opening a cooling tower. This process is performed by the coolant in a "closed" loop, without direct exposure to the atmosphere or external circulating water.
Air travel in a countercurrent cooling tower upwards through a filling or tube bundle, and the opposite water moves downwards. The air in the crossflow cooling tower moves horizontally by filling the water downward.
Another feature of cooling towers is that mechanical ventilation cooling towers that rely on aviation mobiles rely on fans driven by electricity to attract or force the tower air. The high growth of exhaust chimneys used in natural draft cooling towers provides draft air buoyancy. The fan-assisted natural draft cooling tower uses a mechanical draft to increase the buoyancy effect. Many early cooling towers leaned against the wind to produce draft air. If the cooling water is reused from the cooling tower, some water must be added to the replacement or composition, and the flowing part evaporates. Since evaporation includes purified water, the concentration of dissolved minerals and other solid circulating water tends to increase unless some dissolution, such as under the control of solids, is provided. Some water is also lost with the exhaust gas (drift) droplets being carried out, but this is usually reduced to a very small amount by installing a baffle-like device, called drift exclusion, to collect droplets. The amount of compensation must equal evaporation, blow down, total drift, such as wind blowouts and other water seepage losses, to maintain a stable water level.
Cooling towers [1] are different in terms of the relative flow of water and air. The advantages and disadvantages of different types of cooling towers are a long-standing academic debate in the cooling tower industry. This debate has effectively promoted the development of cooling tower technology. In the debate, each has its own strengths and avoids weaknesses, so that the cooling tower technology is constantly improved, and the goals of energy saving, energy efficiency, efficiency, and investment are continuously improved.
The thermal performance of the cooling tower, the noise level, the power consumption, and the amount of drifting water are the keys to measuring the quality of the cooling tower. It is the focus of attention of users and designers when repeatedly selecting and comparing cooling towers.
The cooling tower is a comprehensive product integrating aerodynamics, thermodynamics, fluidics, chemistry, biochemistry, materials science, static and dynamic structural mechanics, and processing technology. Water quality is a multi-variable function, and cooling is a multi-factor, multi-variable and multi-effect synthesis process.
A cooling tower is a device that uses the contact of air with water (directly or indirectly) to cool water. Water is used as a circulating coolant, which absorbs heat from a system and discharges it to the atmosphere, thereby reducing the temperature of the circulating water in the tower, and manufacturing equipment that can reuse the cooling water. With the continuous development of the cooling tower industry, more and more industries and enterprises have applied cooling towers, and many enterprises have entered the cooling tower industry and developed.