First, the working principle

 The working medium of the superconducting heat pipe is made up of a mixture of various inorganic active metals and their compounds. It has extraordinary thermal activity and heat sensitivity. It absorbs heat and is exposed to cold. IGBT heat pipe radiator This kind of thermal superconducting medium is activated at a certain temperature and transmits heat in the form of molecular oscillation. Its super thermal conductivity makes its thermal conductivity 10,000 times that of ordinary metal. It is the ten of water heat pipe. By the time, there is almost no attenuation of temperature in the conduction direction and it can be transmitted at a very fast speed (supersonic transmission).

      Heat pipe radiator principle

      Second, the characteristics

       The super heat pipe has the following characteristics compared with the ordinary heat pipe:

       (l) A wide range of applications. The applicable temperature is 60-1000 ° C, while the general liquid working fluid such as water can only be used at 100-350 ° C. The temperature and pressure curve is shown in Figure 1.

       (2) Safe and reliable. There is no overpressure in the tube, and there is no fear of dry burning. After the liquid working fluid is vaporized, the saturated vapor pressure increases with the increase of temperature, and the internal pressure of the superconducting medium heat pipe does not change with the change of temperature, as shown in Fig. 1.

       (3) Save steel and optimize heat transfer. The design can be made without regard to the compressive strength, and only the heat transfer performance, corrosion resistance and stability can be considered.

       (4) Can eliminate the dead zone of heat conduction. Water and other liquid working fluids have different forms of chemical reactions with the parent metal during the high temperature phase transition. For example, water and heat pipes are prone to generate non-condensable gases such as hydrogen, thereby forming a heat conduction dead zone on the upper part of the heat pipe, which affects the heat transfer effect. Superconducting media heat pipes do not have this problem.

       (5) Easy to install, not subject to installation location. Generally, heat pipes must rely on gravity to achieve circulation of liquids (called gravity heat pipes). The superconducting heat pipe can be installed arbitrarily, and heat can be transferred as long as there is a temperature difference.

       (6) Good thermal conductivity. The heat conduction speed is fast, the strength is high, and the efficiency is high. The heat transfer of the super heat pipe increases with the increase of the temperature difference. Generally, the vapor phase speed of the liquid working fluid cannot exceed the sound speed. Once the sound speed is reached, the phenomenon of “blocking” occurs, as shown in Fig. 2.

      5. Heat pipe heat transfer rate

     (7) Has good isothermality. The test proves that a 4M long superconducting heat pipe has one end placed in hot water of 100 ° C and the other end placed in a windless atmosphere. The temperature difference between the hot and cold ends is not more than 1 ° C; Liquid working fluid heat pipe, the temperature difference between hot and cold ends is as high as 3~4 °C. This shows that the superconducting heat pipe has good isothermality, that is, a small heat flux can be transmitted under a small temperature difference, and the heat transfer resistance is small

       (8) Because the internal pressure is not considered, the superconducting tube shape has greater flexibility and has a wider range of applications.