3 targets, dia. 47mm, solar collector tube
solar vacuum tubes 1.borosilicate 3.3 glass 2.magnetron sputterd 3.multiple selectively absorbing layers 4.optional length
spec. details of solar vacuum tubes
Tri-targets vacuum magnetron sputtering | |
Tube structure | dual tubes, coaxial |
Tube material | Borosilicate glass 3.3 |
Outer tube Dia. and thickness | 47mm |
Inner tube Dia. and thickness | 37mm |
Tube length | 1500-2100mm |
Selective absorbing coating | CU/SS-ALN/ALN |
Sediment method | Magnetron sputtering |
Vacuum degree | 5*10-3 |
Outer tube transmittance | ≥91% |
Absorption rate | ≥96% |
Emittance rate | ≤6% |
heat loss efficient | ≤0.6w/M2°C |
Stagnation tempreture | 260~300°C |
thermal expansion coefficient | 3.3*10-6 |
Pressure endurance | 1mpa |
Impact endurance( dia.) | ≤25mm hailstone |
Service life | 15year |
3 targets, dia. 47mm, solar collector tube