| VACUUM GLASS TUBE TECHNICAL DATAS |
| Technocal data for normal tubes |
| Construction |
All glass concentric dual tube geometry |
|
| Glass material |
Borosilicate glass |
ISO3585:1991 |
| Outer tube diameter and thichness |
Φ=47±0.7mm δ =1.5mm |
| Inner tube diameter and thickness |
Φ=37±0.7mm δ =1.5mm |
| Tube length |
1500mm ± 3mm |
| Level of light transmission |
τ≥0.94( AM1.5 ) |
Absorptive coating
properties
|
Material |
Graded AL-N/AL solar selective abosrbing coating |
|
| Method of deposition |
DC reactive sputtering |
| Absorptivity |
Normal tube: а≥90% |
|
| Emissivity |
ε <6%( 100℃ ) |
| Vacuum |
p < 5 X 10-3 Pa |
| Heat loss coefficient |
ULT ≤0.90W ( m2℃ ) |
| Operationg pressure |
0.6MPa |
| Stagnation temperature |
≥200℃( G ≥ 800W/m2) |
| Basking proformance (m2℃/KW) |
|
Ｙ≥175 |
| MJ/m2 |
Ｈ≤3.8 |
| Minimal lifetime |
8-10years |
