The big brother understands the solar vacuum tube coating technology
Out of the traditional "gradient coating" process, three target coating - aluminum, copper, stainless steel. Due to the fact that the reflection curve is not steep, the emissivity increases with the increase of temperature, which leads to an increase in the emission ratio at 300 - 500
Right, the process is divided into "gradual coating", that is, the traditional coating technology, the latter is "interference coating technology". Color can be adjusted, single target is the oldest technology, three target is currently more common, multi target is the latest invention.
The metal layer is copper plating, high temperature resistance, aging resistance, good reflection performance, and can withstand the drying temperature of 400 degrees celsius. The heat can be increased by about 15% compared with the same type of water heater, the heat collection capacity is extraordinary, in rainy weather still has a certain heat collection efficiency
The "three high" the interference absorption of ultra low emission ratio of selective absorption film can solve the above contradiction, because each of two ceramic metal layer with metal suitable volume ratio, the mutual interference effect with the reflection layer, which has higher solar energy absorption ratio and low emission ratio, at the same time gradient the traditional film in 300 ~ 400 degrees high temperature easy to deform, elegant, such as the failure phenomenon, seriously affecting the late heat collecting effect, and the interference film advanced won't appear similar situation, because it uses three target magnetic sputtering technology, absorbing layer, antireflection layer and metal layer, through the absorption of light interference three tube, improving the heat collecting performance.
