Wound L/LL/KL type Fin Tube In order to reduce the thermal resistance on the air side and the bottleneck effect on the air side, various measures may be taken in the design of the heat exchanger, that is, adding fins to the outer surface of the air side, that is, using fin tubes. The fin tube expands the original heat exchange area on the air side, and the stainless steel laser welded fin tube manufacturer makes up for the shortcomings of low heat transfer coefficient on the air side, greatly increasing heat transfer.

The greater the temperature difference of the wound fin tube that transfers unit heat, the greater its thermal resistance will become. Its thermal resistance is equal to the reciprocal of the heat transfer coefficient, which means that the greater the heat transfer coefficient, the smaller its thermal resistance. Which stainless steel laser welding fins The better the tube. On the contrary, the smaller the heat transfer coefficient, the greater the thermal resistance.

The heat transfer coefficient of the air side is smaller than that of the water side, so the thermal resistance of the air side is greater than that of the water side, becoming the main thermal resistance affecting heat transfer, making the air side a bottleneck in the heat transfer process, limiting the increase in heat transfer.



The advantages of Wound L/LL/KL type Fin Tube

1. Strong heat transfer ability.

2. Compact structure: As the heat transfer area per unit volume increases, the heat transfer capacity increases. Compared with rain tubes with the same heat load, fin tube heat exchangers have fewer tubes and the diameter or height of the cylinder can be reduced because the structure is compact and easy to arrange.

3. Materials can be used more rationally: not only because of the compact structure, but also because the amount of material is reduced, materials can be flexibly selected according to heat transfer and process requirements, such as inlaid or welded fin tubes of different materials.

4. When heating the medium, compared with the light tube, the wall temperature of the finned tube is lower under the same heat load, which is beneficial to reducing high-temperature corrosion and over-temperature damage on the metal surface.

Regardless of whether the medium is heated or cooled, the heat transfer temperature difference is smaller than that of light tubes, which is beneficial to reducing scaling on the outer surface of the tube. Another important reason for reduced fouling is that finned tubes do not form a uniform overall fouling layer along the circumference or axis like plain tubes. Under the action of expansion and contraction, the scale formed along the surface of the fins and tubes will crack at the roots of the fins, causing the scale to fall off on its own.

5. For phase change heat transfer, the heat transfer coefficient or critical heat flux density can be found. The main disadvantages of finned tubes are high cost and large flow resistance. For example, the finned tubes of air coolers have complex processes; high resistance leads to high power consumption. But if the shape is suitable, it can reduce power consumption and be cost-effective compared with the benefits of enhanced heat transfer.



How to prevent Wound L/LL/KL type Finned Tube from freezing due to low temperature?

Wound L/LL/KL type Fin Tube is a derivative of fin tube and a heat exchange element. Heat exchange efficiency can be improved by adding fins to the surface of the heat exchange tubes. After the fin is changed into a spiral shape, its heat transfer area is several times or even dozens of times larger than before, and the spiral fin is a heat transfer element. At present, this product has been widely used in various boilers. This product can also be manufactured using a variety of methods, such as integral spiral fin tubes, high-frequency resistance welding spiral fin tubes, etc. Regular use of this product, regular maintenance, and proper maintenance methods are essential.

Regularly check the adhesion between the rubber pad and each fin tube to avoid leakage caused by degumming of the rubber pad. Every time you press a fin, pay attention to the scale position of the last press to prevent the rubber pad from being over-squeezed and reducing its service life. When replacing the rubber gasket of the spiral fin tube, the entire section must be replaced to avoid uneven gaps between the sheets and affecting the heat transfer effect.

The design of the heating system should try to avoid communication between the system and large oxygen, that is, it should be sealed as much as possible, such as the position of the exhaust cock, the seal of the circulation pump, etc. At the same time, low pressure should be avoided during equipment operation to avoid water loss. When out of service, the finned tubes should be maintained using dry methods or deoxygenated water. When installing a new finned tube for pressure testing, a solvent-based anti-rust agent should be added to the hydraulic pressure test medium.

There is a large margin for heat exchange area. During the use of finned tubes in winter, due to the low flow rate of the heat medium, ice forms inside the fresh air side coil, damaging the finned tubes. Improper handling during the installation and piping process of the finned tubes causes water to accumulate in the low points, which can easily freeze in winter, causing freeze cracks and damage to the finned tubes. The heat exchange area of fin tubes should not leave too much margin. And if the air cooler with remote heating zone is placed behind the air heater, this problem can be avoided. If it is smaller than the cooling area, a separate air heater can be set up to avoid waste.