All-glass Evacuated Solar Collector Tube (SFVA Series)

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

? 25mm

? 25mm

Resist wind

30m/s

30m/s

Start-up temperature

<=25°C

<=25°C