Evacuated collector Tube Geyser

The evacuated tube is the key component to all the thermal Geysers and systems. It’s 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 thin film coating, we use highest absorption rate of near 97% with common rate of 94% and lowest emission rate near 3% with common rate of 5%.

Bellow attached is efficiency curve of Solar vacuum tube and technical datasheet on tubes.