>All glass vacuum tube for solar collector
>High heat effcient, can work all year long
All glass vacuum tube for solar collector specifications:
Glass material | High borosilicate 3.3 glass | |
Externalpipe diameter and thickness | dia.=47±0.7mm &=1.6mm dia.=58±0.7mm &=1.6mm dia.=70±0.7mm &=2.0mm | |
Internal pipe diameter and thickness | dia.=37±0.7mm &=1.6mm dia.=47±0.7mm &=1.6mm dia.=58±0.7mm &=1.6mm | |
Pipe length | 1200mm 1500mm 1600mm 1700mm 1800mm 1900mm 2000mm 2100mm | |
Absorptive coating property | Structure | AL/AL-ALN(H)/AL-ALN(L)/ALN |
Sediment method | Single target magnertron sputtering plating | |
Specific absorption | as=0.90~0.93(AM1.5) | |
Emission ratio | 0.05~0.075(80°c±5°c) | |
Vacuum tightness | P≤5.0×10-³Pa | |
Idle sunning property parameters | Y= 220 ~ 260m²°c/KW | |
Details of All glass Evacuated tube:
All glass evacuated tube consists of two glass tubes made from extremely strong borosilicate glass. The outer tube is transparent allowing light rays to pass through with minimal reflection. The inner tube is coated with a special selective coating (Al-N/Al) which features excellent solar radiation absorption and minimal reflection properties. The top of the two tubes are fused together and the air contained in the space between the two layers of glass is pumped out while exposing the tube to high temperatures. This "evacuation" of the gasses forms a vacuum, which is an important factor in the performance of the evacuated tubes.
