CIB SOLAR Ltd.-Manufacturer of Solar Thermal Products

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Vacuum Tube

Time:2014-04-15 16:37Author:admin Clicked:

All-glass Evacuated Solar Collector Tubes

CIB Solar is one of manufacturers producing all glass tubes of highest quality and efficiency. A more efficient coating has been researched and applied into mass production with absorptance increase by 2%.

All glass vacuum tubes are the key components of solar collectors and solar water heaters. The absorber is coated with selective surface via sputtering technology. The vacuum Layer between the envelope tube and inner tube is evacuated to virtually eliminate heat loss by conduction and convection.

Each production process of vacuum tubes is under strict control, the spectrophotometer has ensured the repeatability and reproduction of the selective coating. Computer monitored out-gassing process is adopted to acquire out-gassing temperature, pressure, and duration time to control the lifetime of vacuum.

Vacuum tubes are produced with lengths (mm) of 1500, 1600, 1800, 2100 with diameters of 47mm and 58mm. 


  • High absorptance a>0.93 (AM1.5) and low emittance e<0.06 (80 deg. C);
  • Borosilicate glass 3.3 with transmittance higher than 91%;
  • Long service life by ensure vaccum integrity;
  • Quality manufacture ensures standadized tube with uniformity and reproducibility;
  • Private logo accepted.

Technical Data

Product name All glass evacuated solar collector tubes
Envelop tube diameter 47mm 58mm
Inner tube diameter 37mm 47mm
Length of tube 1500, 1600, 1800mm 1500, 1600, 1800mm
Solar seletive coating AlN/AlN-SS/Cu
Absorptance (AM1.5) > 0.94
Emittance (80deg.C) < 0.06
Envelope tube thickness 1.6mm 1.8mm
Transmittance 91%
Vacuum 5 x 10-3Pa
Withstanding max. hailstone 25mm diameter
Load quanity 20GP/40GP/40HC 47 x 1500mm tube: 4788pcs/10143pcs/11634pcs
58 x 1800mm tube: 2700pcs/5400pcs/6000pcs

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