Solar Vacuum tube of solar water heater
size:
* 47mmx1500mm
* 47mmx1800mm
* 58mmx1800mm
* 70mmx2000mm
composition: borax and silica glass
Three-high vacuum tubetechnology:
Dimension | Φ47 | Φ58 |
Material of Tube | 3.3 High Boron Silicon | 3.3 High Boron Silicon |
Glass Expansion Ratio | 3.3±0.1×10-6K-1 | 3.3±0.1×10-6K-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 | ≤5.0×10-3Pa | ≤5.0×10-3Pa |
Collecting Performance Parameter under Sunshine | ≥190m2/kw | ≥190m2/kw |
Hailstone Resistance | 25mm | 25mm |
Starts up fast and collects solar energy fully.
Unique super pure copper surface, allowing lower reflection and minimal heatloss.
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!
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