High efficiency solar collector tube Factory

1.Professional manufacture 16 years
2.High absorption efficiency
3.Cetificate CE ISO
4.Stable and ageing-resistant coating


Tri-target solar evacuated glass tube

The outside of the inner tube is coated with copper, aluminum and stainless steel in an entire environment of nitrogen. Cu target, Al target and SS-target are used when adopting the newest magnetron sputtering technology in the process of making selective coating (SS-AlN/Cu), so people call this tube three-target (or tri-target) evacuated glass tube.

The selective coating SS-AlN/Cu is more stable (ageing-resistant). The solar energy absorption ability after the tube being evacuated is above 0.93 (AM1.5).

Due to different coating craft, the color of the tube can be blue or red purple, both of which are well accepted.


Advantages
:
1
.high pressure withstanding ability
2
.high absorption efficiency
3
.low heat loss
4
.stable and ageing-resistant coating
5
.anti-freezing
6
.workability in tough weather
7
.10 years’ warranty
8
.ISO9001:2008 certified

This kind of tube is made of two layers of borosilicate glass which is specially hard. Borosilicate glass 3.3 is an ideal material for solar evacuated glass tube because it has high transparency and can withstand high temperature as well as high pressure.
The absorber layer is coated with stainless steel, aluminum and copper in an environment of entire nitrogen. The selective coating is more stable when stainless steel is added, and the absorptance is higher. Since copper is more effective than aluminum in reducing radioactive heat loss, so heat loss is greatly cut down when copper is coated as the infrared-reflection layer.
The vacuum jacket which is of high vacuum degree is a kind of superior insulation. It reduces heat loss and protects the water in the tube from freezing.
Solar evacuated glass tube can produce hot water even in tough weather. That’s why it is suitable to be used in areas and regions where is very cold or always cloudy.

Technical Specification
1
.Structure: Two concentric borosilicate glass
2
.Material: Borosilicate glass 3.3
3
.Glass thickness: 1.6mm
4
.Thermal expansion: 3.3 × 10
-6
°C
5
.Outer/Inner tube diameter: 47mm/37mm
58mm/47mm
6
.Outer tube diameter×Length: 47mm×1500m/1600mm/1800mm
58mm×1500mm/1600mm/1800mm/2000mm/2100mm
7
.Selective coating: SS-AlN/Cu
8
.Absorptance: 0.90-0.95(AM1.5)
9
.Emittance: 0.04~0.06(80°C+-5°C)
10
.Vacuum degree: P≤5.0×10
-3
(Pa)
11
.Stagnation temperature: 260~300°C
12
.Heat loss: U
LT
= 0.4~0.6w/(m2.°C)
13
.Resistance: Hail diameter≤ 25mm
14
.Solar irradiation for obtaining a preset water temperature rise in an all-glass evacuated solar collector tube under stagnation: H=3.7~4.2 MJ/m2(58mm); H=2.9~3.2MJ/m2(47mm)


Specification
Structure
Two concentric borosilicate glass
Material
Borosilicate glass 3.3
Thermal expansion
(3.3+-0.1)×10
-6
Outer tube diameter
Φ47±0.7mm &=1.6mm
Φ58±0.7mm &=1.6mm
Inner tube diameter
Φ37±0.7mm &=1.6mm
Φ47±0.7mm &=1.6mm
Length
47-1500mm/1600mm/1800mm
58-1500mm/1600mm/1800mm/2000mm/2100mm
Coating
SS-AlNx/Cu
Solar absorption efficiency
0.90-0.95(AM1.5)
Launch ratio
0.04~0.06(80°C+-5°C)
Vacuum degree
P≤3.0×10
-3
(Pa)
Max stagnation temperature
260~300°C
Average heat loss coefficient
U
LT
= 0.4~0.6w/(m2.°C)
Resistance performance
Hail diameter≤ 25mm
Solar irradiation for obtaining a preset water temperature rise in an all-glass evacuated solar collector tube under stagnation
H=3.7~4.2 MJ/m2(58mm)
H=2.9~3.2MJ/m2(47mm)