58*1800mm, solar vacuum 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 | dia.58mm;thickness1.6mm |
| Inner tube Dia. and thickness | dia.47mm;thickness1.6mm |
| 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 |
58*1800mm, solar vacuum tube
