solar water heater glass vacuum tubes with good quality

Vacuum tube:
1.Strict quality inspection
2.Long life span
3.healthy and harmless
4.Good servic


Solar water heater vacuum tube
:


size
:

* 47mmx1500mm
* 47mmx1800mm
* 58mmx1800mm
* 70mmx2000mm

composition: borax and silica glass


Three-high vacuum tube technology:

Dimension
Φ47
Φ58
Material of Tube
3.3 High Boron Silicon
3.3 High Boron Silicon
Glass Expansion Ratio
3.3±0.1×10
-6
K
-1
3.3±0.1×10
-6
K
-1
Outer Diameter of Tube
Φ47±0.7
Φ58±0.7
Inner Diameter of Tube
Φ37±0.7
Φ48±0.7
Thickness of Glass
1.6±0.15
1.6±0.15
Transmittance
≥0.89
≥0.89
Selective Coating
SS-CU-AL-N/AL
SS-CU-AL-N/AL
Absorptivity
≥0.86(AM1.5)
≥0.86(AM1.5)
Emissivity
≤0.080(80±5)
≤0.080(80±5)
Vacuum Degree
≤5.0×10
-3
Pa
≤5.0×10
-3
Pa
Collecting Performance Parameter under Sunshine
≥190m
2
/kw
≥190m
2
/kw
Hailstone Resistance
25mm
25mm

Starts up fast and collects solar energy fully.
Unique super pure copper surface, allowing lower reflection and minimal heat loss.
High level vacuum ensure operation under cold weather.
Long time warranty to 15 years.
Looking forward to having business with you in the near future!

Vacuum tube showing:















vacuum tube