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

Solar Tube, Solar Glass Tube, Glass Tube manufacturer / supplier in China, offering Target etc Solar Vacuum Tube (three layers coating), Vacuum Tube Solar Water Heater, etc Tube, Sloping Roof Stainless Steel Solar Collector and so on.

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Supplier Homepage Product Vacuum tube Target etc Solar Vacuum Tube (three layers coating)

Target etc Solar Vacuum Tube (three layers coating)

FOB Price: US $1.95 / Piece
Min. Order: 10 Pieces
Min. Order FOB Price
10 Pieces US $1.95/ Piece
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Production Capacity: China
Transport Package: Woodencase/ Cartons
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram

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Basic Info
  • Model NO.: 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 diameter58mm
Inner tube diameter47mm
Glass thickness1.6mm
Thermal expansion3.3x10-6 °C
MaterialBorosilicate Glass 3.3
Absorptive CoatingGraded Al-N/Al
Absorptance>92% (AM1.5)
Emittance<8% (80°C)
VacuumP<5x10 -3 Pa
Stagnation Temperature>200°C
Heat Loss<0.8W/ ( m 2 °C )
Maximum Strength0.8MPa

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