Abstract
This study has been focused on the vertical profile determination of the winds under a neutral atmosphere in order to assess of the wind power density at three sites in Guinea. The power law has been used as an extrapolation model for wind speed. The Weibull function has been used to estimate the wind power density. The satellite data at 10 m above the ground recorded during the period from January 2001 to December 2015 on the sites of Conakry, Mamou and N’zérékoré sites were used. The results indicate that the Conakry site is the windiest of the three study sites with an average speed estimated at 2.83 m.s<sup>-1</sup> at 10 m and 4.23 m.s<sup>-1</sup> at 100 m above the ground. The form parameter k of Weibull varies from 1 to 1.8 and the scale parameter c from 1.5 to 6 m.s<sup>-1</sup> and are both increasing functions of altitude. Finally, the quantities of energy obtained at the three sites reveal that only the Conakry site could be suitable for the installation of small wind turbines for the wind energy production. The average annual density is estimated at 45.77 W.m<sup>-2</sup> at 10 m; 85.62 W.m<sup>-2</sup> at 50 m and 113.31 W.m<sup>-2</sup> at 100 m. On the Mamou and N’zérékoré sites, the pumping water from multi-blade wind turbines could be considered.
Highlights
Access to energy is a major challenge for the socio-economic well-being of populations
Power Law In the studies carried out by Justus et al [23], the authors preferred to equate the increasing of the wind speed (Vh) with the height (Zh) in the surface layer at a power law
This law was which is a function of the wind shear coefficient is proposed by Hellman [24] and reported in the works of Spera and Richards, Kulkarni and Huang, Gualtieri and Secci [25, 26, 27]: This law only depends on a single parameter called the wind shear coefficient
Summary
Access to energy is a major challenge for the socio-economic well-being of populations. With the progressive depletion of traditional energy sources and their impact on the environment, it is imperative to reconcile the development strategies of the energy sector with the environment. There are prospects for the renewable energies which are today essential in the energy mix. Among these sources, the wind power is enough promising and the global installed capacity is constantly increasing (from 23,900 in 2001 to 539,581 MW in 2017) [1]. It deserves to be exploited, especially in developing countries. For a better exploitation of wind energy on a site, the availability of wind data at an altitude higher than 10 m above the ground is important for the assessment of potential. The measurement heights of meteorological towers (10 m above the sea level) are generally lower than those of the modern turbines which sometimes exceed 100 m above the ground
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