How can the vacuum tubes of solar water heaters be chromatic aberration? Is purple good or sky blue good?
Appearance: A, nozzle, where the film is more than 800 degrees Celsius, sealing at high temperatures, part of the fall is inevitable. High temperature tube because of high temperature resistance, only about 1 cm long without film, while other tubes because of high temperature resistance, film shedding, length of about 2.5 cm. B, inner tube color: with naked eye observation, high temperature and high temperature pipe inner tube color is dark red (because the film bottom is copper), and the high efficiency tube and ordinary pipe is white (because the film bottom is aluminum). The third kind: Zijin tube, which is plated with copper, absorbs heat and is better than three executives. The color is purple, so it is called purple tube
Features: three, the absorption ratio of executives increased by 12%, the emission ratio decreased by 30% - 40%, super absorption, less heat loss, warming faster. Efficient tube, super absorption, high thermal efficiency, fast heating, in the same light condition, tube can be more than ordinary high temperature hot water; cold tube, due to launch Bibi aluminum ion copper ion is 0.2 lower, so the heat loss is small, can still work normally in the alpine environment, 30 degrees as often out of hot water; high temperature tubes, stainless steel for ion film high temperature resistant, anti air drying coating under the condition of 400 DEG C, aging, decay and discoloration.
Fundamental difference: the structure of the film is different, resulting in the principle of absorbing solar rays is not the same. As a multilayer film, the absorption layer is usually 9 layers. It absorbs the solar rays by layer by layer, and absorbs the light gradually. As a result of this gradient structure, the emission ratio increases with the increase of temperature, so that when the working temperature is 300~500 degrees centigrade, the emissivity ratio increases greatly. Moreover, the aluminum ions in the absorption layer are greatly enhanced and shifted at high temperature. In this way, the internal structure of the film is disordered, leading to the aging of the film. At this high temperature for a long time, the film will fall off, thus affecting the heat collection efficiency and life of the vacuum tube.
