Description

Super three target vacuum tube assimilate the advanced *2 layers of spattering deposition of trivalent element technology to make the tube has high performance of absorptance and low reflection ratio. The solar tube is made from borosilicate glass 3. 3 and the structure of solar vacuum tubes is as same as the gallbladder of the pot, which is sealed with double glass and the double glass tube is pumped into a high-vacuum. The surface of inner glass is sprayed with selective coating through a special technology. The solar energy absorption rate can reach *6 percent by the usage of the selective coating, while the rate of thermal radiation below 4 percent. Vacuum tube absorbs solar energy, and then heats the water or liquid by heat conduction. The heat loss of liquid is very low through the high-vacuum between inner glass tube and outside, Its stagnation temperature is above **0 degrees. It is widely used in solar water heater, solar collecotor, solar projects. It can works in cloundy days. Specification Outer Diameter and Inner Diameter (MM) *7 / *7 *8 / *7 Length of Tube (MM) ***0, ***0, ***0, ***0 Thickness of Tube (MM) 1. *0 more or less 0. *5 Selective absorbing surface: 3layers, aluminum-nitrogen-carbon (Al-SS -CU) vcuum :P≤5****3pa Material: Borosilicate glass 3. 3 Color: Blue Or Black Thermal Expansion: 3. 3 multiply ***6 / k Maximum Strength: 0. 6 Mpa Absorption of Selective Coating: above *6 percent Emission of Selective Coating: below 4 percent Stagnation Temperature: above ******0 degrees / KW Solar Irradiation for Water Temperature Rise below 3. 0mj / m2 Coefficient of Average Heat Loss below 0. *0w / (m2 degree) Vacuum above 3. 0 multipy ***2Pa (anti heat loose) Bearing hailstone ability *5mm