Application conditions of laser welded composite finned tubes
The larger the temperature difference required for the transfer of unit heat of Murphy laser-welded composite finned tube, the greater the thermal resistance will become. The thermal resistance is equal to the inverse of the heat transfer coefficient, indicating that the larger the heat transfer coefficient, the smaller the thermal resistance. The heat transfer coefficient of the air side is less than that of the water side, so the heat resistance of the air side is greater than that of the water side, which becomes the main heat resistance that affects the heat transfer, making the air side become the bottleneck of the heat transfer process and limiting the increase of heat transfer.
In order to reduce the thermal resistance of the air side and overcome the bottleneck effect of the air side, various measures may be taken in the heat exchanger design. Finned tube makes the air side of the original heat transfer area has been greatly expanded, stainless steel laser welding composite finned tube manufacturers, make up for the air side of the low heat transfer coefficient, so that the heat transfer greatly increased.
Laser welding the application field of composite finned tube is constantly expanding, types and specifications of its products in the growing, in the operation in order to facilitate the design and production of finned tube heat exchanger, operate at categorizing finned tube, from the purpose and structure of the combination of classifying finned tube, which can be roughly divided into four types: finned tube heat exchanger, with air and flue gas heat exchanger finned tube, and organic medium and cooling medium heat transfer of finned tube and used in electrical components heat dissipation fin tube.
When operating, the laser welded composite finned tube and the finned tube of air heat exchange can be divided into bimetal composite rolled finned tube, whole rolled aluminum finned tube, laser welded stainless steel finned tube, wound spiral finned tube, l-type finned tube and plate type finned tube.
It is also necessary to understand the heat transfer process and its definition during the operation. The heat transfer of the whole equipment refers to the process of heat transfer from the hot fluid to the cold fluid through the solid interwall, and also includes the heat conduction process of the pipe wall. The strength of the heat transfer process and the amount of heat transfer mainly depend on the characteristics of convection heat transfer on both sides of the wall.
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