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Structure | All-glass double-tube co-axial structure | |
Glass material | High borosilicate 3.3 glass | |
External pipe diam eter 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, 1800mm, 1900mm, 2000mm, 2100mm | |
Absorbing coating property | Structure | Cu/SS-ALN(H)/SS-ALN(L)/ALN |
Sediment method | 3 target magnetron sputtering plating | |
Specific absorption | as=0.93~0.96(AM1.5) | |
Emission ratio | εh=0.04~0.06(80±5) | |
Vacuum tightness | P≤5.0X10-3Pa | |
Idle sunning property parameters | Y=260~300m2./KW | |
Solar irradiation for obtaining a preset water temperature | H≤3.7MJ/m2(Φ47) | H=3.74~4.2MJ/m2 |
H≤4.7MJ/m2(Φ58) | H=2.9~3.2MJ/m2 | |
Average heat loss coefficient | ULT=0.4~0.6W/(m2.) | |
Thi-target vacuum solar tube Working Principle:
Tri-target 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.
three layers evacuated tube