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• W4307465448 endingPage "104788" @default.
• W4307465448 startingPage "104788" @default.
• W4307465448 abstract "The transfer of solar light to the interior of tunnels to complement electrical lighting during daytime, contributes to save energy and decrease the number of installed projectors. The solutions traditionally implemented, based on light-pipes hanging from the vault, seemed reasonable because the leakages of light-pipes can emit luminous flux like projectors, but had the disadvantage of needing higher clearance gauges with the consequent costs in drilling, building materials, works and maintenance. Furthermore, these hanging light-pipes cannot be installed in working tunnels if they were not foreseen in the initial project. In this article, a new concept of light injection and distribution in tunnels is proposed. It consists of the coupling of three main elements: collectors, light-pipes, and one reflecting vault whose design is optimized to ensure the photometric requirements on the pavement. The proposed system can collect more than 1.5 Mlm of solar flux with not excessively large collectors installed on the ground of the road shoulder, and project them to the vault that finally distributes the light towards the pavement. With this flux, average illuminances of 3478 lx and uniformities of 0.73 can be achieved, which means pavement luminance around 350–400 cd/m2, in good agreement with the requirements during daytime. The savings can be higher than 40 %. Besides these savings, this system can be easily implemented in existing tunnels. The proposal and some estimations are discussed." @default.
• W4307465448 created "2022-11-01" @default.
• W4307465448 creator A5003148973 @default.
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• W4307465448 date "2023-01-01" @default.
• W4307465448 modified "2023-10-17" @default.
• W4307465448 title "Daylighting of road tunnels through external ground-based light-pipes and complex reflective geometry" @default.
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• W4307465448 doi "https://doi.org/10.1016/j.tust.2022.104788" @default.
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