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Ray tracing method for simulating daylight transmission through tubular light pipes with anidolic concentrator |
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| รหัสดีโอไอ | |
| Title | Ray tracing method for simulating daylight transmission through tubular light pipes with anidolic concentrator |
| Creator | 1. Thanyalak Taengchum 2. Surapong Chirarattananon |
| Publisher | Joint Graduate School of Energy and Environment |
| Publication Year | 2557 |
| Keyword | daylighting, light pipe, anidolic concentrator, sky luminance, sunlight |
| Abstract | Light pipes can bring both daylight from the sun and daylight from the sky into deep interior spaces of a building. However, light pipes are still considered costly. Adding an anidolic concentrator at the entry port of a light pipe will increase daylight capture and may reduce the overall cost per unit of delivered daylight flux, especially for long pipes or pipes with bends. This paper presents results of modeling, and simulation of transmission of beam daylight through tubular light pipes. Analytic method is used for tracing light rays from the sun and sources in the sky zones through the anidolic concentrator to the straight sections of a pipe through to the exit port. The vertical curvature surface of the anidolic concentrator is modelled as a parabolic section. The algorithms are coded in a MATLAB program. The results show that the concentration ratio of a concentrator is a function of its acceptance angle and the reflectance of its surface. The method can be used for analysis and design of such system. |
| ISBN | 978-616-92228-1-1 |
