High efficiency solar collector tubes

1.Professional manufacturer solar tubes 16 years
2.Certificates:CE ISO9001:2008
3.Testing machine:UV -3600
4.Low heat loss


Material: Borosilicate glass 3.3

We only source from good manufacturers the best borosilicate glass 3.3 that is produced in China. It should have the ability to withstand high temperature and high pressure,as well as high sunlight transparancy which is above 0.91. The best material is the first step to produce products with highest quality. We are always paying not only more money but also great attention to this.

Selective coating: SS-C/Cu
The out surface of the ineer tube is double coated with stainless steel and copper when adopting the newest magnetron sputtering coating technology. This type of selective coating (SS-C/Cu) can endure very high temperature. This is important because the tube is exposed in high temperature to evacuate the jacket between the inner tube and the outer tube. The solar energy absorption ability should be above 0.88.

Vacuum jacket
The inner and the outer tube been sealed together, the tube is exposed in high temperature to evacuate the gas from the jacket between the inner and the outer tube. The vacuum degree should be lower than 3.0×10
-3
(Pa). The vacuum jacket is an ideal insullation protecting the heat energy in the tube.

Technical specification
Length: 1500mm
Outer Tube Diameter: 47mm
Inner Tube Diameter: 37mm
Glass Thickness: 1.6mm
Structure: two concentric borosilicate glass 3.3
Transparancy: 0.91
Thermal Expansion: 3.3 × 10
-6
°C
Selective Coating: SS-C/Cu
Absorptance: 0.88-0.90 (AM1.5)
Heat Loss: 0.4~0.6W/(m
2
°C)
Vacuum Degree: P≤3×10
-3
(Pa)
Emittance: 0.04-0.06(80°C±5°C)
Stagnation Temperature: 260-300°C
Hail Resisteance: hail diameter ≤Φ25mm
Max Strength: 0.8MPa
Certification: ISO9001:2008
Warranty: over 10 years

Specification
Structure
Two concentric borosilicate glass tubes
Material
Borosilicate glass 3.3
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-C/Cu
Solar absorption efficiency
0.88-0.90(AM1.5)
Launch ratio
0..04~0.06(80°C±5°C)
Vacuum degree
P≤5.0×10
-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)