sun vacuum tube for solar water heater, solar collector, solar water heater parts

1 high in quality and great in bargain
2 environment friendly
3 high efficiency
4 certification ISO9001-2000
Golden purple tube

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