solar vacuum tube 1. having a long usage life 2. high absorptance 3. checking equipment imported from Germany

new unpressurized all-glass solar vacuum tube

CCC, CE, ISO9001 Certificate

Specification

Structure: Two concentric borosilicate glass tubes

Material: Borosilicate glass 3.3

Outer tube diamete: Φ70/Φ84

Inner tube diameter: Φ30/Φ37

Length: 70-2000mm;84-2000mm

Coating: triple-target, purple

Glass thickness: 1.6mm/1.8mm/2.0mm

Vacuum degree: P<5*10-3Pa

Thermal expansion: 3.3*10-6/°C

Insolation temperature: >200°C

Absorptance: >95%

Emittance: <4%

Heat loss: <0.8W(m2°C)

Maximum strength: 0.8Mpa

Resist cold: -35°C

Resist hail: 25mm/30mm/35mm

Resist wind: 30m/s

Start-up temperature: <=25°C

Lifetime: 15 years

new unpressurized all-glass solar vacuum tube