tailieunhanh - solar collectors and panels theory and applications Part 2

Tham khảo tài liệu 'solar collectors and panels theory and applications part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 22 Solar Collectors and Panels Theory and Applications rigid. Glass fibres have a light attenuation higher than silica fibres but they are considerably cheaper and more flexible which is a fundamental advantage. Generally plastic is the preferred material to make fibres bundles since it facilitates production and plastic fibre bundles are inexpensive almost unbreakable and extremely flexible. In particular they have a bend radius of few centimetres for a fibre diameter of while a silica fibre of the same diameter has a 900mm bend radius. Glass fibres are slightly more rigid than plastic ones but they usually have lower transmission losses. Nevertheless an innovative plastic fibre bundle realised in a polymeric mixture with an original composition can reach a similar transmission performance to that of glass fibres. For the museum installation fibre bundles were selected in preference to a single fibre. Two fibre materials glass and plastic were considered by examining samples of fibre bundle with seven terminations our samples of plastic fibres were produced by DGA while the samples of glass fibres were produced by 3M . The sample of plastic fibre bundle had a single core diameter of and length 30m. The sample of the glass fibre bundle had a single core diameter and length 40m. To compare the optical performance of these two fibre types measurements were carried out with sunlight and by analysing the illuminance at the fibre ends. These field tests examined the light transmitted by the seven terminations of the fibre bundle coupled to the plastic lens exposed to the sun. The use of the sun tracking system in Sect. 4 is fundamental for performing these tests because it keeps the lens in the sun s direction. The tests were performed at noontime when the illuminance of the sunlight impinging on the demonstrator collectors was 950 lx to 1020 lx. Measurements were repeated with various sun conditions and on different days. The .

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