Throughout present study will be discusses the influence of the manufacturing margins, adjustment precision and ray model accuracy of a collimating LED unit in the overall system performance. It will be also analyzed the angular performance and the collimated in relation to the relative position of the LED and the collimator's dimensions. Finally the results will be compared with existing publications in this field.
We describe an analytical and numerical method to design and optimize LED (light-emitting diode) collimators. The optimization process is confirmed by optical simulations and experimental measurements of a scaled prototype. The collimator's definitive geometry and design parameters rely on the LED's emitting characteristics and the employed collimator material. The resulting parabolic-elliptical-based collimator shows an optimum performance and a compact structure with requirement for mirrored surfaces.
KEYWORDS: Compound parabolic concentrators, Solar energy, Light sources and illumination, Systems modeling, Prototyping, Sun, System integration, Data modeling, Diffusers, Solar energy systems
The main objective of ADASY (Active Daylighting System) work is to design a façade static daylighting system
oriented to office applications, mainly. The goal of the project is to save energy by guiding daylight into a building for
lighting purpose. With this approach we can reduce the electrical load for artificial lighting, completing it with
sustainable energy.
The collector of the system is integrated on a vertical façade and its distribution guide is always horizontal inside of the
false ceiling. ADASY is designed with a specific patent pending caption system, a modular light-guide and light
extractor luminaire system. Special care has been put on the final cost of the system and its building integration purpose.
The current ADASY configuration is able to illuminate 40 m2 area with a 300lx-400lx level in the mid time work
hours; furthermore it has a good enough spatial uniformity distribution and a controlled glare. The data presented in this
study are the result of simulation models and have been confirmed by a physical scaled prototype.
ADASY's main advantages over regular illumination systems are:
-Low maintenance; it has not mobile pieces and therefore it lasts for a long time and require little attention once installed.
- No energy consumption; solar light continue working even if there has been a power outage.
- High quality of light: the colour rendering of light is very high
- Psychological benefits: People working with daylight get less stress and more comfort, increasing productivity.
- Health benefits
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