Energia solar anual absorvida por concentradores lineares do tipo fresnel aplanático em Maceió-AL

Abstract

Among the possibilities for reducing the use of fossil fuels is replacing them with alternative energy sources. The sun is our biggest source of renewable energy, its radiation is widely available across the planet and can be used to capture heat. In this way, solar concentration technologies are being used, more and more, for domestic and industrial processes that need to heat fluids or generate electricity. Linear Fresnel concentrator collectors are an interesting option for generating saturated steam at temperatures of up to 200°C in small and medium-sized systems, mainly due to their greater simplicity and lower costs, when compared to other solar concentration systems, especially the parabolic cylinder. Thus, this work highlights an estimate of annual energy absorption in the city of Maceió by the aplanatic Linear Fresnel concentrator (CFLA), which proved to be capable of reaching high temperatures for steam generation in radiation concentrator systems, with the purpose of converting thermal energy into electric with high efficiency. With a total half-angle of 9 mrad and given a Gaussian brightness distribution, the analytical modeling of the losses validated through ray tracing allowed the estimation of the annual energy absorbed by aplanatic Fresnel linear concentrators: CLFA {-1; -0.1} with C = 50 and γ(0.0) = 0.72, and CLFA {-2.2; - 0.03} with C = 35 and γ(0.0) = 0.84, with the latter achieving the highest amount of annual energy absorbed.