Fresnel Lens And Compound Parabolic Concentrators Design And Research

All along, the PV systems are too costly and difficult for practical application in large-scale promotion, while the main reason for high cost of PV system is the solar panels is too expensive. In this way, concentrating photovoltaic system (CPV) for its expected to reduce the high cost of photovoltaic systems is stand out. The concentrator of concentrating photovoltaic system performance good or bad, is to determine whether the system while maintaining the output power and to reducing the cost of electricity is the key of all. Therefore, the design and research of the concentrator has become a priority.Based on the basic optical principles, combined with common method of concentrator design to study the design of Fresnel lens, Derived formula for calculating the angle of tooth inclination of Fresnel lens, and according to the formula derived design of a Fresnel lens. Use optical software for ray tracing of Fresnel lens, analysis the light intensity and irradiance distribution of the surface at different locations. Meanwhile, according to the formation principles of compound parabolic concentrator (CPC), study of the design method of compound parabolic concentrator, derived compound parabolic concentrator design formula for calculating the main parameters, and according to the formula derived design of a compound parabolic concentrator. Use optical design software for ray tracing compound parabolic concentrator, analysis of intensity and irradiance distribution of the receiving surface at different angles of incident light.According the condenser performance of the Fresnel lens and compound parabolic concentrator, propose using of a combination of them to forming the secondary concentrator, to increases the acceptance angle of concentrator and to improve concentration ratio and to optimize condenser light uniformity. The studies of the secondary concentrator show that although the use of combination of Fresnel lens and compound parabolic concentrator can effectively increase the acceptance angle, but it cannot optimize the uniformity of light uniformity. Therefore, the condenser of the secondary optical concentrator is analyzed to identify the leading causes of poor uniformity condenser is proposed in the compound parabolic concentrator to add a reverse to put the uniform distribution of light Fresnel lens improved method. Analysis showed that the improved secondary condenser while maintaining a large acceptance angle, while the condenser uniformity can be achieved to an acceptable level.