We continue speaking about the tube solar power collectors.
Due to the fact that the coolant flows directly through the pipe in the reservoirs they have, there are difficulties in the installation. Each tube should be connected to the system separately in order to avoid leakage of coolant. We need also serious maintenance, because leakage or mechanical damage even of one tube stops the work of collector. The vacuum tube consists of two glass tubes: outer is made from ultra strong transparent borosilicate glass that can withstand the impact of hailstones with a diameter of 25 mm, internal one is the same but with a special selective coating (A1-M/A1) that ensures excellent heat absorption with minimal reflection. In order to avoid conductive and convective heat loss from the space the air is exhausted between the two tubes.
To maintain the vacuum barium gas absorber is used, which is exposed to high temperatures in a production environment, resulting in lower end of the vacuum tube is covered with a layer of pure barium. It absorbs CO, CO2, N2, O2, H2O and H2, which are distinguished from the tube during storage and operation, and is a clear visual indicator of the vacuum. When the vacuum disappears, barium layer transforms into white from silver. This makes it easy to determine whether a pipe works correctly.
The absorption of heat occurs in the copper heat-pipe, which is located inside the vacuum tube. Method of heat transfer from its thermal conductivity is very simple.
Copper tube is hollow and contains a patented inorganic non-toxic liquid. When heated, the liquid evaporates, and because of the vacuum created inside of a tube, it occurs even at a temperature of 25-30
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