Common Solar Energy Glass Vacuum 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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Common Solar Energy Glass Vacuum Tubes use a vacuum tube solar collector to eliminate the heat loss of the gas convection and conduction, and the application of selective absorbing coating makes the radiation heat loss down to the minimum. It structures pressure well and can work in high temperature.
The specification of Common Solar Energy Glass Vacuum 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
Internal pipe diameter: D=37±0.7mm
D=47±0.7mm
Thickness of vacuum tube: 1.6mm / 1.8mm
Heat loss coefficient: ≤0.90 / ≤0.85 / ≤0.80
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
Solar absorption ratio(AM1.5): 0.93
Emission ratio: 0.06
Anti-hail capability: No damage from D25mm hail impact