Evaluation of the spot shape on the target for flat heliostats
Authors: Jafrancesco D., Fontani D., Francini F., Sansoni P.
Autors Affiliation: CNR-INO National Institute of Optics, Largo E. Fermi, 6-50125-Firenze, Italy
Abstract: The aim of this study is to evaluate the changes of the spot shape on the target in dependence of the variations of size and faceting of a flat heliostat or an array of heliostats. The flat heliostat, or a flat heliostat array, is a layout common for Concentation Solar Power (CSP) plants. The spot shape is evaluated by means of a numerical integration of an appropriate function; in order to confirm the results, both an analysis based on the Lagrange invariance and some simulations are performed. The first one validates the power density value in the central part of the spot, while the simulations assess the spot shape, which in its central part differs less than 3% from the calculated result. The utilized numerical method does not require specialized software or complex calculation models; it determines an accurate spot shape but cannot take into account shading and blocking phenomena.
Volume: 11 (7) Pages from: 1621-1 to: 1621-18
KeyWords: Concentration (process); Heliostats (instruments); Optical design; Solar energy, Calculation models; Lagrange; Numerical integrations; Power densities; Solar; Specialized software; Spot shapes, Numerical methodsDOI: 10.3390/en11071621Citations: 1data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-11-28References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here