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Start Over Descriptor "Torque tube" Journal mechanics & industry
2 results on '"Torque tube"'

1. Wind effect on full-scale design of heliostat with torque tube.

Author

MAMMAR, M., DJOUIMAA, S., HAMIDAT, A., BAHRIA, S., and EL GANAOUI, M.

Subjects
*HELIOSTATS, *WIND tunnels, *TESTING of wind tunnels, *SOLAR collectors, *WIND pressure, *COMPUTER simulation
Abstract

Despite the importance of designing support structures for solar collectors, very little reliable work has been done to investigate the forces of the wind on heliostats of solar tower at real scale. Wind loads on heliostats are usually determined at low-speed wind tunnels scale, where the design full-scale Reynolds number cannot be reached. In the present study, measured data are used to validate the simulations at wind tunnel scale. Thereafter, by using the same method, three-dimensional numerical simulations of turbulent wind flow around a big heliostat of solar tower are performed. The obtained numerical results are presented for several elevation angles at normal operation and stow position. The results revealed that the known stow position (when the backside of the heliostat is facing the ground) is not the optimum position (other optimum elevation angles are discovered) especially with high wind speed, and the effect of torque tube is significant on heliostat mean wind loads. [ABSTRACT FROM AUTHOR]

Published
2017
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2. Wind effect on full-scale design of heliostat with torque tube

Author

A. Hamidat, M. Mammar, M. El Ganaoui, Sofiane Bahria, S. Djouimaa, Centre de Développement des Energies Renouvelables (CDER), Ministère de l'Enseignement Supérieur et de la Recherche Scientifique [Algérie] (MESRS), Laboratoire d'Etude et de Recherche sur le Matériau Bois (LERMAB), and Université de Lorraine (UL)

Subjects
Engineering, Heliostat, Scale (ratio), Meteorology, 020209 energy, Full scale, 02 engineering and technology, 7. Clean energy, Industrial and Manufacturing Engineering, Wind speed, [SPI]Engineering Sciences [physics], symbols.namesake, 0202 electrical engineering, electronic engineering, information engineering, Astrophysics::Solar and Stellar Astrophysics, General Materials Science, ComputingMilieux_MISCELLANEOUS, Wind tunnel, business.industry, Turbulence, Mechanical Engineering, Reynolds number, Torque tube, Physics::Space Physics, symbols, business, Marine engineering
Abstract

Despite the importance of designing support structures for solar collectors, very little reliable work has been done to investigate the forces of the wind on heliostats of solar tower at real scale. Wind loads on heliostats are usually determined at low-speed wind tunnels scale, where the design full-scale Reynolds number cannot be reached. In the present study, measured data are used to validate the simulations at wind tunnel scale. Thereafter, by using the same method, three-dimensional numerical simulations of turbulent wind flow around a big heliostat of solar tower are performed. The obtained numerical results are presented for several elevation angles at normal operation and stow position. The results revealed that the known stow position (when the backside of the heliostat is facing the ground) is not the optimum position (other optimum elevation angles are discovered) especially with high wind speed, and the effect of torque tube is significant on heliostat mean wind loads.

Published
2017

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