all glass solar vacuum tube 1.OEM offered 2.three target coating(SS-CU-ALN/ALN) 3.15 years quality warrant  Main introduction:            Three Target Vacuum Tubeassimilate the advanced 12 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 96 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 270 degrees. It is widely used in solar water heater, solar collecotor, solar projects. It can works in cloundy days.

Features:

Three Target Vacuum tubeHigh solar-thermal conversion and low heat loss Stable advanced coating up to 380 Long time warranty to 15 years High level vacuum ensure operation under cold weather

Vacuum Tube technology:

Models 47×150 58×180 Weight 1.35±0.12kg 2.29±0.18kg Structure All-glass-coaxial double-layer tubes All-glass-coaxial double-layer tubes Outer tube diameter 47±0.7mm 58±0.7mm Inner tube diameter 37±0.7mm 47±0.7mm Outer Tube thickness 1.6±0.15mm 1.8±0.15mm Inner tube thickness 1.6±0.15mm 1.8±0.15mm Tubes length 1542±4mm 1812±4mm Material of coating Al N/Al N-SS/Cu Al N/Al N-SS/Cu Absorptance 0.94~0.96 0.94~0.96 Emittance 0.04~0.06 0.04~0.06 Vacuum P≤5×10-3pa P≤5×10-3pa Transmittance of Outer Tube 0.91 0.91 Stagnation temperature (height) 270~300 270~300 Heat-loss coefficient ≤0.6w/ m2*) ≤0.6w/ m2*) Bearing hailstone ability hailstone diameter25mm hailstone diameter25mm Pressure-endure ability 1MPa 1MPa

Linuo glass vacuum tube