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Two target solar water heater tube
1.Raw material
Two target solar water heater tube is made up of two layers of high borosilicate glass 3.3,which is a strong glass that can withstand high internal pressure and external force.
2.Outer tube
The outer tube is transparent and smooth,thus,the UV rays can pass through it easily with minimum reflection.
3.Inner tube
The inner tube is coated with a thermal radiation absorbing layer,stainless steel,carbon and copper(SS-C/Cu), this layer could also reduces reflection in order to increase absorptivity.
Specification | |
Structure | All glass double tubes concentric |
Material | Borosilicate glass 3.3 |
Outer tube diameter | Φ47±0.7.mm &=1.6mm |
Inner tube diameter | Φ58±0.7.mm &=1.6mm |
Length | 47mm-1500mm/1600mm/1800, |
58mm-1500mm/1600mm/1800mm/2000mm/2100mm | |
Coating | SS-C/Cu |
Absorption rate after evacuating(AM1.5) | α= 0.88-0.90 |
Emission rate after evacuating(AM1.5) | ε= 0.04-0.006(80°C±5°C） |
Vacuum degree | P≤5.0×10¯³Pa |
Average heat loss conficient | ULT = 0.4-0.6w(m².°c) |
Max stagnation temperature (temperature inside of empty vacuum tube) | 260°C-300°C |
Pressure | 0.6MPa |
Impact Resistance | Φ≤25mm |
Two target solar water heater tube