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.
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