Heat pipe is a new type of heat transfer element with high thermal conductivity. The heat pipe originated in the United States in 1960s. In 1967, a stainless steel water heat pipe was successfully put into operation when it was sent to the orbit of the earth satellite. As soon as the theory of heat management was put forward, scientists all over the world attached great importance to it and carried out a lot of research work, which made the heat pipe technology develop rapidly. Heat pipe technology began to be mainly used in the field of aerospace and aviation. Since the 1970s, China began to study the heat pipe, and it has been developed and used successively since the 1980s.
working principle:
The heat pipe is made of steel, copper and aluminum pipes filled with heat-conducting medium, pumped into a certain vacuum and sealed. The working medium in the pipe is made of a variety of compounds. It has extraordinary thermal activity and thermal sensitivity. When it is hot, it absorbs, when it is cold, it releases. This kind of thermal superconductor is activated at a certain temperature and transmits heat in the form of molecular concussion phase transition. Its strong thermal conductivity makes its thermal conductivity about 10000 times that of ordinary metals. The conduction temperature does not decay and can be transmitted at a fast speed.
Characteristic:
1. Strong thermal conductivity: fast thermal conductivity, high strength, high efficiency, reliable thermal conductivity up to sonic speed.
2. Good isothermal property: good isothermal property makes the heat pipe transfer large heat flux and small heat transfer resistance under small temperature difference.
3. Variability of heat flow density: the heat pipe can change the heating area of evaporation section and cooling section, that is, the heat pipe can input a smaller heating area and output a larger cooling area, or the heat pipe can input a larger heat transfer area and output a smaller cooling area.
4. Reliability: there is no overpressure in the tube. After vaporization of liquid working medium, the internal pressure of heat pipe does not change with the change of temperature.
5. Environmental adaptability: not limited by the environment, the heat pipe can be designed independently according to the needs of the environment.
6. Wide application fields: the shape of superconducting heat pipe has greater flexibility, more extensive application fields, and can adapt to all kinds of harsh working environment.
Performance characteristics of heat pipe waste heat recovery:
1. Heat pipe waste heat recovery has high heat transfer efficiency and remarkable energy saving effect.
2. Flexible installation and layout: the structure design and location layout are very flexible, suitable for various complex occasions.
3. Long service life: the service life is more than 15 years, single heat pipe can be disassembled and replaced, simple maintenance and low cost.
4. Short payback period: generally, all investment can be recovered in six months to one year.