Specifications

Vacuum tube
1.Raw material:High borosilicate glass 3.3
2.Absorptivity:090-0.95
3.Price:USD 2.5-4.0 each piece Qingdao Port

Three target purple 47mm 58mm vacuum tube

 

Three target vacuum tube is made of high borosilicate glass 3.3,which could resist hail resistance of steel ball(Φ30mm) from the height of 450mm.

 

The evacuated process of all vacuum tubes last more than 3 hours in order to ensure the perfect vacuum degree,thus, the insulation will be fully guaranteed.

 

This vacuum tube adopts sputtering technology (SS-ALNx/Cu),which could not only make sure the high absorptivity ,but the lifespan of coating layer could reach to 15 years or even longer. 

 

 

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	≤5.0×10­-³ (Pa)
Stagnation temperature	260°c-300
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)