Three Target Evacuated Solar Vacuum Tube Collectors

Specificationssolar evacuated tubes
1. High efficiency than flatplat
2. Pressure system
3. 10year manufacture experience
4. CE solarkeymark
The outer tube is made of extremely strong transparent quartz sand which can resist impact from hail up to 25mm in
Diameter.
5. The inner tube is also made of quartz sand, but it is coated with a special selective coating with strong heat absorption and lowest heat loss.
6. The air is evacuated from the space between the two glass tubes to form a vacuum, so it eliminates heat loss.
7. This why the tubes are able to absorb the energy from infrared rays which can pass through clouds.
8. So it also can operate in low temperature and low sunlight medium. MODELITEMSGB(single target)

Configuration Double-layer concentric boronsillicate glass tubes
Glass thermal expansion coefficient 3.3*10-6/3.3*10-6
Diameter of outer tube 47± 1mm 58± 1mm
Diameter of absorber tube 37± 1mm 47± 1mm
Thickness 1.5mm(± 0.1mm) 1.6mm(± 0.1mm)
Transmittance of outer tube 0.91 0.91
Length 1500± 5mm 1800± 5mm
Solar selective absorbing coatingAl-N/AlAl-N/Al
Absorptance(AM1.5)≥ 0.89≥ 0.89
Emittance≤ 0.0880≤ 0.0880
VacuumP≤ 5*10-3PaP≤ 5*10-3Pa
Stagnation parameter≥ 230/KW≥ 230/KW
Average Heat loss coefficient ≤ 0.85W/(*)≤ 0.85W/(*)
Solar irradiation under stagnation ≤ 3.5MJ/≤ 3.5MJ
Hailstone resistance hailstone diameter 25mm hailstone diameter 25mm
Pressure-endure ability 0.6mPa 0.6mPa