Steel-aluminum composite finned tubes are cold-rolled from pressure-resistant tubes and aluminum tubes, which overcome the defect that aluminum and other metals cannot be welded.
Steel-aluminum composite finned tubes can also be called bimetallic finned tubes, heat exchange tubes, heat dissipation tubes, and rolled tubes in the industry. Using the compression resistance of the inner lining and the heat transfer properties of aluminum, the properties of both materials, such as light weight, were emphasized.
The proportion of aluminum in common non-ferrous metals and ferrous metals is very small. The lightweight metal fin material determines the properties of the heat exchangers made from it.
Steel-aluminum composite finned tubes have good heat transfer performance, and the thermal conductivity of aluminum is about 211.9W/mK, which is cheaper than silver and copper, and has higher economic benefits. Objects that transfer heat tend to absorb heat quickly and dissipate it quickly, with low airflow resistance.
The outer surface of the steel-aluminum composite finned tube is lubricated and wrinkle-free, the airflow passes through the fins for a short distance, and has low contact thermal resistance.
The experimental results show that under the working condition of less than 210°C, the contact thermal resistance of the steel-aluminum composite finned tube is almost zero, and the contact thermal resistance is small, which is beneficial to heat exchange.
Steel-aluminum composite finned tubes are not easy to accumulate dust and scale. Surface water is easy to clean and decontaminate, resistant to temperature changes, and can maintain heat exchange function for a long time.
In order to improve heat exchange efficiency, fins are usually added to the surface of the heat exchanger to increase the surface contact area (or inner surface) of the heat exchanger to achieve the purpose of improving heat exchange efficiency.
This heat exchange tube can be called finned Sheet tube. As a heat exchange element, the finned tube can work for a long time in a high-temperature flue gas environment.
For example, the finned tube used in a boiler heat exchanger has a harsh environment, high temperature and high pressure, and is in a corrosive atmosphere.
The performance of the finned tube is very demanding. high. This kind of steel-aluminum composite finned tube is characterized by tighter bonding, low thermal resistance, good heat transfer function, high strength, small loss, strong corrosion resistance, and is not easy to deform under long-term cold and hot conditions.
Longer service life. All rolled fins are lubricated, wrinkle free and easy to clean. When wet cooling is carried out in heating and air-conditioning projects, the condensed water on the outer surface of the fins is simply and effectively removed, and it is not easy to accumulate dust and scale in places with alternating heat such as dry heat.