Gold Member Since 2009
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Changzhou Snug Solar Energy Co., Ltd.

Solar Collector, Water Heater, Solar manufacturer / supplier in China, offering High Quality Glass Vacuum Tube etc Type, Evacuated Tube Non-Pressurized Solar Hot Water Heater System, Attractive Appearance Pre-Heated Solar Thermal Water Heater and so on.

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Supplier Homepage Product Vacuum tube High Quality Glass Vacuum Tube etc Type

High Quality Glass Vacuum Tube etc Type

FOB Price: US $2.2 / Piece
Min. Order: 10 Pieces
Min. Order FOB Price
10 Pieces US $2.2/ Piece
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Production Capacity: China
Transport Package: Woodencase/ Cartons
Payment Terms: L/C, T/T, D/P, Paypal, Money Gram, Western Union

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Basic Info
  • Model NO.: Vacuum tube
  • Pipe Material: Glass
  • Length: 1500/1800/2000mm
  • Coating: Al-N-Al/Al-Cu-Ss
  • Specification: CE; Solar Keymark
  • HS Code: 84191900
  • Application: Water Heater, Solar Thermal, Air Conditioning System
  • Pressurized: Pressurized
  • Thickness: 1.6mm/2.0mm
  • Trademark: SNUG SOLAR / OEM
  • Origin: Changzhou, China
Product Description
Evacuated tubes are the absorber of the solar water heater. They absorb solar energy converting it into heat for use in water heating. Each evacuated tube consists of two glass tubes made from extremely strong borosilicate glass.

The inner tube is coated with a special selective coating (Al-N/Al) which features excellent solar radiation absorption and minimal reflection properties. The top of the two tubes are fused together and the air contained in the space between the two layers of glass is pumped out while exposing the tube to high temperatures.

This "evacuation" of the gasses forms a vacuum, which is an important factor in the performance of the evacuated tubes. The vacuum in the evacuated glass tube is less than 5× 10-3pa This can only be reached and maintained over a long period of time through a specialised evacuation process in production resulting in an almost total elimination of convection and conduction losses from the tube.
Length (nominal) 1500mm /1800mm
Outer tube diameter 58mm
Inner tube diameter 47mm
Glass thickness 1.6mm
Thermal expansion 3.3x10-6 °C
Material Borosilicate Glass 3.3
Absorptive Coating Graded Al-N/Al
Absorptance >92% (AM1.5)
Emittance <8% (80°C)
Vacuum P<5x10 -3 Pa
Stagnation Temperature >200°C
Heat Loss <0.8W/ ( m 2 °C )
Maximum Strength 0.8MPa
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