Solar Energy Vacuum Tube

Thursday, May 28, 2009

The evacuated tube is the key component to all the thermal heaters and systems. It'is similar to a Conventional Dewar flask and consists of two borosilicate glass tubes, resistant to high chemical and thermal shock. The outer side of the inner tube is coated with a sputtered solar selective surface. This coated inner tube is closed at one end and sealed at the other end to the outer tube. The annular space between the outer tube and inner tube is evacuated to avoid heat loss in conduction and convection. The key element determines function of tube is the technology of the film coating.

Vacuum Tube 1.8 m
Tube Out side diameter mm58
Tube Inside diameter mm 47
Wall Thickness mm 1.6
Transmittance Outer Tube <8%
Absorbency Percentage %＞93%
Heat Loss w/m2 <0.8W/(m2)
Strength Pressure Tested 0.8Mpa
Lifetime 15
Transmittance Outer Tube <8%
Strength Pressure Tested Mpa 0.8Mpa
Certification: CE, ISO9001