Three target glass solar tube

1.Standard 3.3 high-boron-silicon glass-pipe 2.Low coefficient of heat loss, 3.Without water and high efficent of heat absor

Three target glass solar tube

The inner tube of this product is coated with a special coating (SS-ALNx/Cu) which features excellent solar radiation absorption and minimal reflection.

To guarantee the perfect vacuum status,there is one barium getter in the bottom of the inner tube which cause the bottom of the solar tube is coated with a pure layer of barium. The barium will become white if the vacuum is lost.Therefore,this barium layer work as the  visual inspector.

Raw material	high borosilicate glass 3.3
Glass thickness	1.6mm
Outer tube length	1500mm,1600mm,1800mm,2000mm,2100mm
Outer tube diameter	47mm±0.7mm, 58mm±0.7mm
Inner tube diameter	37mm±0.7mm, 47mm±0.7mm
Coating material	SS-ALNx/Cu
Absorptance	0.90~0.95 (AM1.5)
Emittance	0.04-0.06(80°C±5°C)
Vacuum degree	≤5.0×10­³ (Pa)
Stagnation temperature	260°C~300°C
Average heat loss coefficient	0.4~0.6W/(m².°C)
Hail resistance	≤25mm
Solar irradiation for obtaining a preset water temperature rise in tube under stagnation	3.7~4.2MJ/m²(Φ58mm) 2.9~3.2MJ/m²(Φ47mm)

Three target glass solar tube