OPTIMIZATION OF ROW PLACEMENT OF SOLAR ENERGY COLLECTORS FOR THE CLIMATIC CONDITIONS OF THE SOUTH OF UKRAINE
The maximum amount of solar energy falling on the surface of multiple collector rows occurs when effect of shading one row by another is negligible. The existing methods for calculating of incident solar radiation on collector planes under conditions of shaded rows are not capable to give a universal answer about the optimal placement of rows for any place, and data on solar insolation for particular location are required for optimization. Since the methods based on the calculation of absolute solar energy falling on the whole collector field require additional non-energy criteria of optimization, it is necessary to focus on solar radiation per unit area of shaded collector.The aim of this work is to calculate incident solar radiation per unit area of a partially shaded collector row and to determine the optimal parameters of multiple row placement of collectors for the climatic conditions of the south of Ukraine.A method for calculating of incident solar energy for the case of partially shaded collector row taking into account direct and diffuse solar radiation as well as radiation reflected from the underlying base and inclined collector surfaces is presented. Expressions for the annual incident solar energy per unit collector area of the shadowed row depending on the tilt angle and the distance between the rows have been obtained for the climatic conditions of Kherson. These expressions make it possible to avoid cumbersome calculations when the data on annual incident energy under conditions of shading are needed. It is shown that the optimal position angle, which determines the distance between the collector rows, is the angle of the Sun height at solar noon on December 21. The optimal tilt angle of collectors that provides the maximum annual solar radiation per unit area of the shaded collector row has been determined.
Parameters of the multiple row placement of collectors have been calculated for the climatic conditions of other cities of the south of Ukraine and the average values of optimal position angle and optimal tilt angle of collectors were determined. Ref. 8, tab. 8, fig. 4.
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