Using Prismatic Structure and Brightness Enhancement Film to Design Cascadable Unit of Static Solar Concentrator in Natural Light Guiding System

摘要

Due to the energy crisis, the principle of green energy gains popularity. This leads the increasing interest in renewable energy such as solar energy. How to collect sunlight for indoor illumination is our ultimate target. A Natural Light Guiding System includes collecting, transmitting, and lighting parts. To date, most studies of collecting part have delicate in dynamic concentrators which include sun tracking systems. They are powered by small electric motors and require some type of control module to follow sun path, so it requires maintenance and adds a good bit of complexity to the system. The application area of dynamic concentrator is limited. In order to create a low cost, easily set up, and applied on large area structure, we design a unit of static concentrator to collect sunlight for indoor illumination which is prismatic and cascadable. The unit is made up of prismatic structure and can collect the nature light, sunlight, for indoor illumination. For offer more saving energy and more stable illumination, we consider the total collected energy in the whole day and the relationship between the efficiency of the static concentrator and time. We change the size of prism to be different and add the BEF structure to improve the unit. According to the simulation, the prismatic structure with different right-angle prism could advance the total collected energy and the BEF could advance the stabilization of efficiency in the whole day.