Evacuated tube for solar thermal system

The tubes are made from low emissivity borosilicate glass (glass with a very low iron content that has superior durability and heat resistance ) with an all-glass seal and they employ AL/N on AL selective coating, which enables the use of the whole solar energy spectrum to generate heat.

This produces greater thermal efficiency in bright sunshine but also produces high efficiency in overcast or diffuse sunlight conditions. Further, the tubes are evacuated and have a barium getter (vacuum indicator) which changes color from silver to white if a tube`s vacuum has been compromised.

An examination of the tubes shows that the outside is actually 2 layers of glass and a vacuum has been created between them.


A good way to demonstrate this would be to fill an empty tube with very hot water and notice that it does not even get warm as you hold the tube in your hands. That is because of the [thermos effect" created by having a vacuum between the layers of glass.

Started the production of vacuum tube/evacuated tube since 1998. 

Annual production capacity of 5 million pieces. 

Daily prodution capacity of 20000 pieces tubes.

Has been supplying the Vacuum Tube towards the worldwide well-known manufacturer of Solar Water Heater and solar thermal products. 

Higher absorption rate of 92%-94%, lower emission rate.

47-1500mm, 58-1800mm, 58-2100mm tubes are avaliable.

Key component of Solar Collector and solar water heater

Coating material: Al-N/Al or SS-Al/N/Cu.

Specification