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5. Shadowing and blocking factors in heliostats: Comparison between parallel and oblique projections.

Author

Arrif, Toufik, Sánchez-González, Alberto, Bezza, Badreddine, and Belaid, Abdelfetah

Subjects
*HELIOSTATS, *ALTITUDES
Abstract

This work reports two projection methods for the calculation of shadowing and blocking in the surrounding heliostat field of a Solar Tower Plant. The first one is the classical parallel projection which is widely used in the literature. The second one is the oblique projection which has been barely addressed in the literature. For the same solar altitude, the frames of two adjacent heliostats are not parallel in reality, and consequently, the projection of the shadowing and blocking areas is not parallel. Compared with raytracing methods, these two projection methods have been developed to reduce the computational cost without affecting efficiency accuracy. Therefore, they are suitable for heliostat field optimization. We have chosen a case study presented by Collado1, that used parallel projection in the calculations. Differences between parallel and oblique approaches are shown. Shading and blocking factors by the more accurate oblique projection are compared with the parallel one. The maximum difference is 0.09% and 1.44%, respectively for parallel and oblique projection in calculating the shading and blocking factor of a circular field of 4550 heliostats. [ABSTRACT FROM AUTHOR]

Published
2022
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7. Design optimization of a solar tower power plant heliostat field by considering different heliostat shapes.

Author

Belaid, Abdelfetah, Filali, Abdelkader, Gama, Amor, Bezza, Badreddine, Arrif, Toufik, and Bouakba, Mustapha

Subjects
HELIOSTATS, SOLAR power plants, SOLAR thermal energy
Abstract

Summary: The present study focuses on the optimization of solar tower power plant heliostat field by considering different heliostat shapes including rectangular, square, pentagon, hexagon, heptagon, octagon, and circular heliostat shapes. The optimization is carried out using an in‐house developed code‐based MATLAB program. The developed in‐house code is validated first on a well‐known PS10 Solar Thermal Power plant having rectangular heliostats shape and the resulting yearly unweighted heliostat field efficiency of about 64.43% could be obtained. The optimized PS10 heliostat field using different heliostat shapes showed that the circular and octagon heliostat shapes provide better efficiency with minimum land area. The yearly efficiency is increased from 69.65% for the rectangular heliostat shape to 70.96% and 71% for the octagon and circular shapes, respectively. In addition, the calculated field area (land area) is reduced for the case of circular and octagon heliostat shapes with a gain of about 11.10% and 10.93% (about 42.0436 × 103 and 41.4036 × 103 m2), respectively, in comparison with the PS10 field area. [ABSTRACT FROM AUTHOR]

Published
2020
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