Fresnel lens analysis for solar energy applications

In this paper, we analyze a linear Fresnel lens of arbitrary shape as an independent focusing stage or as the first stage of the second stage focusing system. The second row treats the first row as a Lambert light source. We determined the gain and position of all possible configurations of the lens and proved that the curved lens with refractive index close to infinity and a given profile is the ideal concentrator To demonstrate.

One of the most common uses of Fresnel lenses is the collection of sunlight. This is considered to be very close in parallel (infinite conjugate system). Concentration with Fresnel lens is ideal for converging on photovoltaic cell and heating surface. For example, Fresnel lenses can be used for general home maintenance, such as home and pool heating. In these cases, the total surface area of ​​the lens determines the amount of light collected. Although it is common for solar applications, Fresnel lenses are very suitable for applications requiring cheap, thin and lightweight positive lens parts. Although Fresnel lenses are not novelty, their popularity has been increasing due to improvements in manufacturing techniques and materials. Fresnel lenses are truly unique optical lenses, making it an ideal tool for a variety of interesting and interesting optical designs.

Solar energy is one of the most promising renewable energy sources and is very important for sustainable development of energy. This paper presents a new type of solar concentrator with focus Fresnel lens. The design principle of the solar concentrator was demonstrated and the spectral collection performance was simulated by Monte Carlo ray tracing (MCRT) and compared with the linear Fresnel lens. The results showed that spectral concentration uniformity and optical efficiency of the Fresnel lens by focusing are better than those of linear focusing Fresnel lenses. At the same time, analyzing some characteristic parameters of Fresnel lens concentrators with different focusing conditions, the result of the optical efficiency of the concentrating solar power generation (CPV) system is to focus the Fresnel lens concentrator from a high ratio Can be improved. In the middle.

In this paper, we have studied and compare line focused Fresnel lens solar collectors using different resonator receivers. Line focus Fresnel lens with each cavity receiver The thermal performance of a solar collector was experimentally studied at different temperature levels. Fresnel lens using different types of line focusing cavity receivers The efficiency coefficient and the heat dissipation factor of the solar collector can be obtained both theoretically and experimentally. Eight cavity receivers were tested and analyzed: triangles, curves, rectangles, semicircles, regular trapezoids, inverted trapezoids, molded trapezoids and convex shapes. The results showed that the theoretical results agree well with the experimental results. Line Focusing Fresnel Lens In the case of the solar collector, the triangular cavity receiver shows the best thermal performance. When the operating temperature is 180 ° C, the maximum experimental heat removal coefficient is about 0.805.

Thermal performance analysis of line focused Fresnel lens solar collector using different resonator receiver