Sangao Solar Glass Tubes have high-performance absorption ratio, low reflectance ratio and strong heating.
Minimum Order Quantity: 100 Piece/Pieces
Supply Ability: 5000 Piece/Pieces per Week
Payment Terms: L/C,D/P,T/T
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The specification of Sangao Solar Glass Tubes
Structure | All-glass double-tube co-axial structure |
Glass material | High borosilicate 3.3 glass |
External pipe diameter | D=47±0.7mm D=58±0.7mm D=70±0.7mm |
Internal pipe diameter | D=37±0.7mm D=47±0.7mm D=58±0.7mm |
Thickness of vacuum tube | 1.6mm / 1.8mm |
Heat loss coefficient | ≤0.90W( m2.) / ≤0.85W( m2.) / ≤0.80W( m2.) |
Sun exposure temperature | ≥200 |
Coefficient of thermal expansion of glass | 3.3×10-6 |
Cover glass tube transmittancy | 0.91 |
Solar selective surface coating sputtering gradient | Al-N / Al/ Cu |
Solar absorption ratio(AM1.5) | 0.93 |
Emission ratio(80) | 0.06 |
Anti-hail capability | No damage from D25mm hail impact |