Research Of Solar Concentrating And Tracking System Based On Fresnel Lens

In recent years,solar lighting becomes one of the research hotspots and important applications in the field of solar utilization.Introducing sunlight into rooms for illumination is to reduce energy consumption,because of the lack of illumination in some areas of buildings which are not shined directly.Solar lighting can improve the quality of human life effectively.Therefore,more attention has been paid to solar lighting.The fiber-optic solar introducer has the advantages of high optical transmission efficiency,flexible structure,and low installation expenditure.For concentrating sunlight effectively,the lens is usually used for introducing sunlight into the fiber.There are some shortcomings in existing techniques of solar concentrating and tracking system,such as small size of lens,complex concentrating system,and poor tracking stability.This dissertation focuses on the theoretical analysis,simulation,experimental research of solar concentrating and tracking system based on Fresnel lens,and proposes two kinds of fiber-optic solar concentrating system which consist of tracking and concentrating together.The main tasks are as follows:1.The fiber-optic solar concentrating and tracking system based on Fresnel lens was studied,and the layout of the system is determined.The design of two solar concentrators based on Fresnel lens has been completed to ensure the requirements of high-precision and large-angle concentrating;2.The design and evaluation of performance of each part of the solar concentrating and tracking system were completed,including the parameter design of the Fresnel lens that is one of the key components of the concentrator.The parameters of the Fresnel lens and the tracking angle were analyzed and calculated based on Matlab.3.Large-scale and high-precision tracking effect was realized by the GPS tracking and the photoelectric tracking which overcomes the defects caused by the separate design of the traditional concentrating lens and tracking lens.4.A simple model of concentrating system based on the Fresnel lens was built and some experimental research was carried out.The research works in this dissertation provide a feasible approach for the fiberoptic solar concentrating based on Fresnel lens to promote the development and application of solar lighting concentrating system.