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Solar Tube (SFVA)
Solar Tube (SFVA)

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Apply for selective absorbing coating material of normal all-glass vacuum tube to collect solar energy;

SFVA4715
Diameter: 47mm
Length: 1.5M

SFVA5818
Diameter: 58mm
Length: 1.8MApply for selective absorbing coating material of normal all-glass vacuum tube to collect solar energy

SFVA4715
Diameter: 47mm
Length: 1.5M

SFVA5818
Diameter: 58mm
Length: 1.8M


Length
 

1500mm
 

1800mm
 

Outer tube diameter
 

47mm
 

58mm
 

Inner tube diameter
 

37mm
 

47mm
 

Weight
 

1.3kg
 

2.2kg
 

Glass thickness
 

1.6mm
 
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/(m 2 °C)
 

<0.8W/(m 2 °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
 
Effective collector
area m 2
Diameter of solar tube
 
Length of solar tube
 
SFVA4715
 
Ø47mm
 
1.5M
 
0.0966
 
 
SFVA5818
 
Ø58mm
 
1.8M
 
0.1350
 

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