S58 series, 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
Single Target vacuum magnetron sputtering | |
Tube structure | dual tubes, coaxial |
Tube material | Borosilicate glass 3.3 |
Outer tube Dia. and thickness | dia.58mm, thickness.1.6mm |
Inner tube Dia. and thickness | dia.47mm, thickness.1.6mm |
Tube length | 1500~2100mm |
Selective absorbing coating | AL-ALN/ALN |
Sediment method | Magnetron sputtering |
Vacuum degree | 5*10-3 |
Outer tube transmittance | ≥91% |
Absorption rate | ≥93% |
Emittance rate | ≤8% |
heat loss efficient | ≤0.8w/M2°C |
Stagnation tempreture | 220~260°C |
thermal expansion coefficient | 3.3*10-6 |
Pressure endurance | 0.8mpa |
Impact endurance( dia.) | ≤25mm hailstone |
Service life | 15year |
S58 series, solar vacuum tube