sun vacuum tube for solar water heater

1 high in quality and great in bargain
2 environment friendly
3 high efficiency
4 certification ISO9001-2000
The all-glass vacuum tube is made up with the inside glass tube sun selective absorption coating vacuum sandwich cover glass tube, provide support (spring), getter.



specification
Structure
All-Glass Double Tube Co-Axial Structure
Glass Material
High Borosilicate 3.3 Glass
External Pipe Diameter & Thickness
dia.=47±0.5mm &=1.6mm, dia.=58±0.5mm &=1.6mm,
Internal Pipe
Diameter & Thickness
dia.=37±0.5mm &=1.6mm, dia.=47±0.5mm &=1.6mm,
Pipe Length
1500mm,1800mm
Absorptive Coating Property
Structure
Cu/SS-ALN(H)/SS-ALN(L)/ALN
Sediment Method
Three Layer Magnetron Sputtering Plating
Specific Absorption
as=0.92~0.96(AM1.5)
Emission Ratio
0.01~0.03(80°C±5°C)
Vacuum
P≤2.0×10-3Pa
Idle Sunning Property
Y= 260 ~ 300m²°C/KW
Solar Irradiation for Obtaining a Preset Water Temperature
H≤4.7 MJ/ m²(dia.58)
Solar Irradiation for Obtaining a Preset Water Temperature
H≤3.7 MJ/ m²(dia.47)

Average Heat Loss Coefficient
Ult=0.4~0.6W/( m².°C)
Pressure-Endure Ability
1.0Mpa
Hail-Endure Ability
30mm
Lifetime
15years

FEATURE: a perfect combination of the vacuum tube and the heat pipe
1. higher heating efficiency:
Heat transferring can be started quickly even under cloudy day. It can work normally even -30 below degree. As no water in the vacuum tube, it can effectively prevent the lowering of heating efficiency due to frost cracking or scaling
2. Each individual tube can work independently, and the whole machine can still work if individual tube is damaged. The service life of the heat pipe can be longer than 15 years
3. The unique connection between the heat pipe and the vacuum tube can ensure both sealing and replace of the damaged glass vacuum tube.