What is the best quality of solar vacuum tube
The membrane filtration layer has no scratch, no peeling or shedding phenomenon, no stone or nodular phenomenon on the glass, and the supporting parts of the inner glass are provided with the correct and not loose. 2 when you want to pay attention to: the pipe is not the bigger the better, too thick too long, the invalid water in the pipe increases, the heat of the night radiation will be very large, the second day will be very slow to enter the working state. Standard pipe diameter of 47 mm is reasonable at present, Zijin coating invented in our country, has been close to the theoretical limit of solar absorptance (about 0.97 higher than the national standard (0.8611 percentage points, this technique makes Chinese continue to adhere to the international advanced level in the field of solar light and heat utilization
Purchase should be carefully observed in the vacuum tube glass coating on the tube, which is called the solar selective absorbing coating, because the factory production process, color coating will be different, the same batch of glass tube may show a slight color differences, but within the normal range, usually black, dark blue or dark gray, color coating good quality uniform
Purchase of domestic solar water heater should not only pay attention to the beauty of the bracket should be observed: 1 stent material corrosion resistance; if there is resistance 2 bracket design, wind resistant area as small as possible; all cross 3 support bracket material and strength. 4 domestic solar water heater reflector is very important and a variety of forms, there are flat reflector, curved reflector, embossed aluminum, etc..
