Solar water heating system: Enjoy free hot water
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15 Apr 2011 03:54 AM
The evacuated tube solar collector works by absorbing solar energy in the form of UV rays and converting it into thermal energy. An evacuated tube solar collector contains a number of evacuated tubes. Each evacuated tube is responsible for independantly absorbing the sun's radiation that reaches it. An evacuated tube is made up of 2 layers of strong borosilicate glass that are joined together. There is a vacuum in between the 2 layers of glass. This layer of vacuum allows the tube to retain its heat once it is gathered. The UV rays are absorbed by an absorbing film which lies in between the 2 layers of glass on the inside layer. This special absorbing film absorbs more than 92% of the UV rays that incident the tube and rejects less than 8% back to the atmosphere.

Benefits Over Other Solar Collectors:
•Snow falls in between the tubes and thus does not cover the collector
•The collectors do not sit flush on a roof and thus do not affect the life of the roof
•The tubes do not get hot; thus the captured energy is not lost to the atmosphere
•Due to their high efficiency, less collectors and roof space are required
 •The collectors are very easy to install
•The life space of each collector is more than 20 years
•Not affected by temperature and thus can operate in the coldest climates
•The evacuated tube promotes solar tracking
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