Apricus Evacuated Tubes

Evacuated tubes absorb of solar energy converting it into heat. Evacuated tubes have been used for years in Europe, the Middle East, Canada, China and the UK. There are several types of evacuated tubes in use in the solar industry. Apricus collectors use the most common "twin-glass tube" format. This type of tube is chosen for its reliability, performance and low manufacturing cost.

The evacuated tubes are made of two extremely strong borosilicate glass tubes. The outer tube is transparent allowing light rays to pass through with minimal reflection. The inner tube is coated with a special Aluminium – Nitrogen/Aluminum coating (Al-N/Al) which provides excellent solar radiation absorption with minimal reflection properties. The two tubes are fused together at the top and the air contained in the space between the two layers of glass is pumped out. This vacuum, an excellent insulator, is an important factor in the performance of the evacuated tubes. The superior insulation properties of vacuum allow the inside of the tube may rise to 150oC / 304oF while the outer tube remains cold to touch.

The evacuated tube is exposed to high temperatures During manufacture causing the bottom of the evacuated tube to be coated with a pure layer of barium. The barium layer actively absorbs Carbon Monoxide (CO), Carbon Dioxide (CO2), Nitrogen (N2), Oxygen (O2), Water (H2O) and Hydrogen (H2), thus helping to create the vacuum. The barium layer also provides a visual indicator of the vacuum status. The silver coloured barium layer will turn white if the vacuum is ever lost making it easy to verify if a tube has lost its vacuum.

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