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Bimetallic fin tube thermal conductivity

The size of the thermal conductivity of a metal material indicates the size of the thermal conductivity of the metal. The greater the thermal conductivity, the correspondingly lower thermal conductivity and thermal conductivity will increase. At present, most of the radiator or heat sink materials used in electronic devices on the market are almost all made of aluminum alloy, and only a few of them use other materials for heat dissipation. But in fact, aluminum is not the metal material with the best thermal conductivity. The best effect is silver, followed by copper, and then aluminum.

Copper-aluminum combined radiator: The so-called copper-aluminum combination is to perfectly combine copper and aluminum with a certain process, so that copper can quickly transfer heat to aluminum, and then the heat is dissipated by a large area of ​​aluminum, which not only increases The heat conduction of aluminum is not as good as that of copper, and it also makes up for the inferior heat dissipation of copper to aluminum. The organic combination achieves the effect of rapid heat transfer and rapid heat dissipation.

Most of the heat exchanger materials are made of metal materials, and the thermal conductivity of different metal materials is very different, and the thermal conductivity of the same material at different temperatures is also different. As can be seen from the above table, silver has the highest thermal conductivity among commonly used materials, and copper and aluminum are second only to silver. The fin material of the bimetallic fin tube is made of aluminum, which is the use of aluminums high-efficiency thermal conductivity.

Carbon steel has low thermal conductivity, but it is convenient to obtain materials, so it has been widely used. There is a certain gap between the thermal conductivity of stainless steel and that of carbon steel. Many units manufacture stainless steel radiators according to carbon steel design schemes, which is unscientific. The above table is a table of thermal conductivity of commonly used metal materials, which is an indispensable data when calculating the total heat transfer coefficient of heat exchangers.