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Help CenterSingle-target Vacuum Tube
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Specifications
Single-target glass vacuum tube, high efficiency and good performance, especially for solar energy collecting to heat hot waterSingle target vacuum tube
Technical Parameters
Structure |
All-glass double-tube co-axial structure |
|
Glass material |
High borosilicate 3.3 glass |
|
External pipe diameter and thickness |
Φ=47±0.7mm &=1.6mm, Φ=58±0.7mm &=1.6mm, Φ=70±0.7mm &=2.0mm |
|
Internal pipe diameter and thickness |
Φ=37±0.7mm &=1.6mm, Φ=47±0.7mm &=1.6mm, Φ=58±0.7mm &=1.6mm |
|
Pipe length |
800mm, 1200mm, 1500mm, 1600mm, |
|
Absorbing coating property |
Structure |
AL/AL-ALN(H)/AL-ALN(L)/ALN |
Sediment method |
Single target magnetron sputtering plating |
|
Specific absorption |
as=0.90~0.93(AM1.5) |
|
Emission ratio |
εh=0.05~0.075(80±5) |
|
Vacuum tightness |
P≤5.0X10-3Pa |
|
Idle sunning property parameters |
Y=220~260m2./KW |
|
|
Solar irradiation for obtaining a preset water temperature |
H≤3.7MJ/m2(Φ47) |
H=4.1~4.4MJ/m2 |
H≤4.7MJ/m2(Φ58) |
H=3.1~3.4MJ/m2 |
|
Average heat loss coefficient |
ULT=0.6~0.7W/(m2.) |
|
Working Principle
All-glass solar vacuum tube, connecting with water tank or manifold, when it works, cold water flows down into the vacuum tube, and there it is heated with solar energy absorbed by the coating outside of inner vacuum tube, the solar will be absorbed efficiently by the coating with little loss of heat because of the vacuum between the inner and outer glass tubes, and when cold water becomes hot, hot water will rise up to water tank or manifold because of the larger proportion to cold water, cold water again flows into solar vacuum tube for another heating process.
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