Solar water heaters are now basically available to every household. We are not new to solar water heaters, but we may not be familiar with the internal parts, such as solar water heater collector tubes. Most people are not very familiar with this. Now, let's introduce the difference between the vacuum tube and ordinary tube of solar water heater.
Solar water heater heat collecting tube
Different film structures lead to different principles of absorbing solar light. Gradual film is a multi-layer film. Its absorbing layer is generally 9 layers. It absorbs the sun's light layer by layer, and its performance of absorbing light gradually becomes higher. Due to this gradual structure, the emission ratio increases with temperature, so that the operating ratio is greatly increased when the working temperature is 300 ~ 500 ° C. In addition, the aluminum ions in the absorption layer under the high temperature state are greatly enhanced in activity and drift. In this way, the internal structure of the film layer is disordered, causing the film layer to begin to age. Under this high temperature state for a long time, the film layer will fall off, which affects the heat collection efficiency and life of the vacuum tube.
The absorption ratio of the vacuum tube has been increased by 12%, and the emission ratio has been reduced by 30% -40%. It has super absorption, less heat loss, and rapid heating. High-efficiency tube, super absorption, high thermal efficiency, fast heating, under the same light conditions, can produce more hot water with higher water temperature than ordinary tube; high-cold tube, because the copper ion emission ratio is 0.2 lower than aluminum ion, so Very little damage, can still work normally in the high and cold environment, hot water as usual at -30 ℃; high temperature special effect tube, because the stainless steel ions in the film layer are resistant to high temperature and air, the film layer does not age or Attenuates and does not change color. Under the same lighting conditions, the heat absorption of ordinary pipes is not as high as that of three high pipes, and it can not even meet the requirements of bathing. At lower temperatures, the heat loss is greater, and the heat collection efficiency is reduced, which affects normal use. Especially when the air exposure exceeds 270 ℃, The film begins to age and fall off, the absorption rate decreases rapidly, and the life span is greatly shortened.
High-temperature special-effect tubes, high-cold tubes, and high-efficiency tubes use three-target, dual-target, and single-target magnetron sputtering processes; ordinary tubes generally use single-target magnetron sputtering processes.
A. Nozzle, when the film is sealed at a high temperature above 800 ° C, part of it is unavoidable. The high-temperature special-effect tube is only about 1 cm long without a film layer due to high temperature resistance, while the other tubes are about 2.5 cm long due to the high temperature resistance.
B. Inner tube color: With the naked eye, the inner tube color of the high-temperature and high-temperature tube is dark red (because the bottom layer of the film is copper); the high-efficiency tube and ordinary tube are white (because the bottom layer of the film is aluminum).
The difference between the solar water heater vacuum tube and the ordinary tube is the one introduced above. Now the most used solar water heater collector tube is the vacuum tube. Although the ordinary tube is also used in some homes, the comparison of the vacuum tube clearly shows that it is not Out of advantages, so if we want to choose a good collector tube at this time, then the vacuum tube is definitely the first choice.