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

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

Item No.

Specification

Diameter of solar tube

Length of solar tube

SFVA4715

Ø47mm

1.5M

SFVA5818

Ø58mm

1.8M