High Quality Solar Vacuum Tube
Technical Specifications
Length 1500mm/1800mm
Outer tube diameter 47mm/58mm
Inner tube diameter 37mm/47mm
Weight 1.3kg/2.2kg
Glass thickness 1.6mm
Material Borosilicate Glass 3.3
Absorptive coating Graded A1/N/A1
Vacuum degree P<5*10 -3 Pa
Thermal expansion 3.3*10 -6C
Insolation Temperature >200C
Absorptance >93%
Emittance <8%
Heat loss <0.8W/(m2C)
Maximum strength 0.8Mpa 0.8Mpa
Resist cold -35C
Resist hailstone 25mm diameter
Resist wind 30m/s
Start-up temperature <=25C