Closed-circuit cooling tower

Closed-circuit cooling tower

In industrial production and large commercial facilities, cooling systems are an indispensable key part of ensuring the normal operation of machinery and equipment. Among them, closed-circuit cooling towers, as an efficient and energy-saving cooling method, have received widespread attention and application in recent years. This article will provide a detailed introduction to closed-circuit cooling towers from the aspects of basic principles, structural characteristics, application advantages, and maintenance.

I. Basic Principles of Closed-circuit Cooling Towers

As the name suggests, the core feature of a closed-circuit cooling tower is that its cooling process takes place within a relatively closed system. Compared with traditional open-circuit cooling towers, the working medium (usually cooling water) of a closed-circuit cooling tower does not directly contact the outside air, but exchanges heat with the air through a heat exchanger, thus effectively avoiding water pollution and water evaporation loss.

Its working principle is roughly as follows: Hot water flows out from the machinery and equipment and enters the inside of the heat exchanger tubes of the closed-circuit cooling tower. At the same time, the outside air is sucked into the tower by the fan and passes through a specially designed filler layer. The filler layer increases the contact area between the air and the outer surface of the heat exchanger tubes, improving the heat exchange efficiency. As the air flows through the heat exchanger tubes, it absorbs the heat from the hot water in the tubes, and then is discharged outside the tower, while the hot water is cooled due to heat loss and then flows back to the machinery and equipment for continued use.

II. Structural Characteristics

The structure of a closed-circuit cooling tower is compact, mainly composed of a heat exchanger, fan, filler layer, water pump, water tank, and control system.

Heat exchanger: Usually made of high-efficiency heat exchange materials, such as copper tubes or stainless steel tubes, it has good thermal conductivity and corrosion resistance.

Fan: Responsible for drawing outside air into the tower and ensuring that the air flows through the filler layer and heat exchanger tubes to achieve heat exchange. The selection of the fan should be reasonably matched according to the scale and heat exchange requirements of the cooling tower.

Filler layer: Located above the heat exchanger tubes, it is used to increase the contact area between the air and the heat exchange surface, improving the heat exchange efficiency. The filler material is mostly plastic or metal, with good air permeability and corrosion resistance.

Water pump: Responsible for transporting hot water from the machinery and equipment to the heat exchanger for cooling, and returning the cooled water to the machinery and equipment.

Water tank: Used to store cooling water to ensure stable water volume during system operation.

Control system: Achieves automatic control of key components such as fans and water pumps to ensure that the cooling tower operates safely and efficiently.

III. Application Advantages

Good water-saving effect: Because the closed-circuit cooling tower uses a closed-loop circulation, it greatly reduces the evaporation loss of water. Compared with open-circuit cooling towers, the water-saving rate can reach 90% and above.

Water quality protection: The closed-loop circulation avoids direct contact between the cooling water and the outside air, effectively preventing water pollution and scaling problems, and extending the service life of the system.

Energy saving and emission reduction: Closed-circuit cooling towers use high-efficiency heat exchange technology and fan speed control to adjust the operating power according to the actual load, achieving energy saving and emission reduction.

Wide range of applications: Suitable for various industrial production and commercial facilities that require cooling, such as power plants, chemical plants, data centers, and hospitals.

Xi'an Aobang Technology Co., Ltd. is one of the earliest manufacturers in China to mass-produce medium-frequency furnaces. Main products include medium-frequency power supplies, IGBT power supplies, melting furnaces, heating furnaces, and other full series of induction heating equipment. Focusing on induction heating equipment research and manufacturing Based in Xi'an, Aobang Technology takes "technology-driven industrial heating innovation" as its mission. Relying on the core technology accumulated from early mass production, it provides customers with full-cycle services from equipment selection and installation and commissioning to process optimization.

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