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Working Principle of Vacuum Solar Tube
Collectors are the key component of Massloads Solar Water Heater. Each of them is configured by two concentric glass tubes with Thermal expansion 3.3x 10-6 °C, the outside surface of inner glass tube is coated, with the latest world magnetron sputtering Hi-Techs, layers of aluminum-nitrogen with aluminum base, which absorbs and converts the maximum amount (>0.92,80oc) of solar radiation including infra red light into heat, whilst having very small radiation losses(<0.09,80oc). The jacket between outer and inner glass tubes is evacuated and permanently sealed off to form the best possible insulation, which allows sunlight penetrate perfectly while preventing heat loss. In order to maintain the vacuum between the two glass layers, a barium getter (gas absorbent) is used inside the top end of the outer tube.
During manufacturing this getter is exposed shortly to high frequency magnetic fields, which create high temperatures in one second resulting in the bottom of the evacuated tube being coated with a pure layer of barium.
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