Why Bimetallic Aluminum Fin Tube are widely applied in air cooled heat exchanger?

Steel-aluminum composite finned tube

The steel-aluminum composite finned tube is cold-rolled and composited on a special machine tool by a pressure-resistant base tube and an aluminum muff tube, which overcomes the shortcomings of aluminum and other metals that cannot be welded or rolled sheet tube. It utilizes the pressure resistance of the base tube and the efficient heat transfer of aluminum; the plasticity highlights the process characteristics of the two materials.

Steel-aluminum composite finned tubes have incomparable advantages over other types of finned tubes.

(1) Light weight. The specific gravity of aluminum is the smallest among the commonly used non-ferrous metals and ferrous metals, and the fin material of light metal determines that the heat exchanger made of it has the characteristics of light weight.

(2) High heat transfer performance. The thermal conductivity of aluminum is about 211.9W/m.K, which is lower in cost and more cost-effective than silver and copper. Objects with good thermal conductivity tend to absorb heat quickly and dissipate heat quickly.

(3) The air resistance is small. After the steel-aluminum composite finned tube is processed and formed, the fin surface is smooth and wrinkle-free. Air can easily penetrate from within the fin spacing.

(4) Low contact thermal resistance. Practice has proved that the contact thermal resistance of the steel-aluminum composite finned tube is almost zero in the working environment below 210 degrees. Low contact thermal resistance is a performance guarantee for efficient heat transfer.

(5) The heat dissipation area is large. The finning ratio of steel-aluminum composite fins can reach a maximum of 22.7. The unit heat dissipation area is much larger than that of conventional finned heat pipes.

(6) Long service life. During the processing of the steel-aluminum composite finned tube, the base tube and the aluminum fin are tightly combined into one. And a 0.5mm thick coating layer is formed on the surface of the base pipe to protect the base pipe from contact with the external ambient air, which can improve the service life.

(7) The steel-aluminum composite finned tube is also resistant to dust formation and scaling. It is easy to clean and remove surface water, has good resistance to temperature changes, and can maintain good heat transfer performance for a long time.