58mm*1800mmthree target vacuum tube for split pressurized solar water heater with SRCC ,solar keymark (FACTORY)

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