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September 1, 2021
The high-efficiency heat exchanger mainly breaks the fluid laminar bottom layer on the inner and outer sides of the pipe through the special shape of the pipe to enhance the heat transfer efficiency. Compared with the ordinary tube heat exchanger, the efficiency is improved. Naturally, under the same demand, the volume can be small, especially suitable for the transformation and expansion of the existing device. There are more than ten kinds of high-efficiency heat exchangers. Let's learn about their principles.
Wound tube high efficiency heat exchanger
Wound tube heat exchanger is a new type of high efficiency heat exchanger with compact structure and high heat transfer efficiency. The heat exchange tubes are alternately wound between the core cylinder and the outer cylinder according to the spiral shape. The adjacent two layers of spiral heat exchange tubes rotate in the opposite direction, and a certain shape spacing element is used to keep them at a certain distance. The reverse winding of layer to layer heat exchange tubes greatly improves the fluid flow state and forms a strong turbulence effect; The enhancement of the spiral flow state of the medium in the tube also increases the heat transfer coefficient on the tube side; The fixed distance elements between layers also disturb the flow of fluid on the shell side. Under the joint action of the three aspects, the heat transfer efficiency of the heat exchanger has been greatly improved.
High flux tube high efficiency heat exchanger
The high flux tube high efficiency heat exchanger is to evenly spray or sinter metal powder on the surface of the smooth tube. These powders form a layer of porous metal powder with many micropores and interconnected tunnels on the surface of the heat exchange tube. The surface porous coating not only increases the heat transfer area, but also forms countless vaporization cores, which greatly accelerates the nucleation rate of bubbles. In the process of bubble growth and escape, the interconnected porous coating also accelerates the stirring of local liquid and further strengthens the heat transfer coefficient outside the tube. The heat transfer efficiency of the heat exchanger has been greatly improved under the joint strengthening of many aspects.
Internal wave external thread tube high efficiency heat exchanger
The heat exchange tube of the internal wave external threaded tube high efficiency heat exchanger is a special tube with spiral corrugated inner wall and threaded outer wall. The spiral inner ripple structure makes the fluid boundary layer near the wall continuously damaged, which effectively reduces the thickness of the fluid boundary layer. When the outside of the pipe is under condensation condition, the condensate can be easily discharged from the threaded groove, avoiding the formation of condensate film and effectively reducing the heat transfer resistance outside the pipe. Thus, the overall heat transfer efficiency of the heat exchanger is greatly improved.
The next article takes you through several other high-efficiency heat exchangers. Bellows type, T-groove tube type, Inner grooved tube type, Twisted tube type.......