All-glass Evacuated Solar Collector Tube (SOLAR WA

Length 1500mm 1800mm Outer tube diameter 47mm 58mm Inner tube diameter 37mm 47mm Weight 1.3kg 2.2kg Glass thickness 1.6mm 1.6mmMaterial Borosilicate Glass 3.3 Borosilicate Glass 3.3 Absorptive coating Graded A1/N/A1 Graded A1/N/A1 Vacuum degree P<5*10 -3 Pa P<5*10 -3 Pa Thermal expansion 3.3*10 -6 /°C 3.3*10 -6 /°C Insolation Temperature >200°C >200°C Absorptance >93% >93% Emittance <8% <8% Heat loss <0.8W/(m2°C) <0.8W/(m2°C) Maximum strength 0.8Mpa 0.8Mpa Resist cold -35 °C -35 °C Resist hailstone Ø 25mm Ø 25mm Resist wind 30m/s 30m/s Start-up temperature <=25°C <=25°C