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Let's look at the design features of the evacuated tube in more detail.

The tubes are made from a type of glass called Borosilicate, the same base material as used in many Pyrex glass products used in kitchens around the world.

The most common methods include direct water flow, U tube pipe, pipe-in-pipe or heat pipe.

Apricus AP solar collectors use a heat pipe to extract the heat from within the evacuated tube and transfer it to heat exchanger part of the collector.

In order to help maintain the vacuum over the 15-20 year life of the evacuated tube, a barium getter "soaks up" any remaining gases in the evacuated chamber plus any fresh gases such as Nitrogen that can slowly permeate through the glass over time, a process known as out-gassing.

This barium layer also provides a clear visual indication of the vacuum status; the silver-coloured barium layer turns white if the vacuum is lost making it easy to identify a fault tube.Borosilicate glass has the characteristic of being very strong and also has excellent light transparency (92% @ 2mm thick) .The wall thickness of the glass greatly impacts the strength, longevity and naturally also the cost.The absorber coating comprises a base layer of Aluminium on the outside of the inner glass tube followed by thin layer of the dark coloured AL/N material.These coatings are applied using a method called dc reactive sputtering which is extremely reliable after having been finetuned over the past 20 years since it was developed.Referred to as the "Sydney" tube, "twin-tube" or "all-glass", the tube is essentially two glass tubes that are fused at the top and bottom.

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