Communications Internationales
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Item Contribution to the design of a Parabolic trough collector with composite material using GRP pipes scrap(2017) Baali, Brahim; Benmounah, A.; Kari, D.; Mohammedi, K.The world revolution is moving towards a low-carbon and sustainable development. When environmental costs and considerations of security of supply are included, renewable energy becomes the alternative to be considered. Among renewable energies, Parabolic Trough Collector power plants constitute the biggest share of the installed concentrating solar power technology. The bearing structure is the most expensive part of a parabolic trough power plant. It has the function to carry the mirrors in the right position, to give stability to the troughs and to allow an exact Sun tracking. To fulfill these functions, structures must meet certain requirements. In particular, the stiffness requirements are very high. It’s obvious that an inappropriate carrier structure should involve additional material and manufacturing costs. Composite materials have great potential to be suited for development of renewable energy structures. It refers to any structure with two or more distinct materials that are combined to create an engineered product with properties greater than the sum of its parts. Glass reinforced polyester (GRP) with E-glass as the reinforcing fiber is the most common form of composite construction. GRP pipes scraps derived from cutting process can be revalorized and used in the bearing structure of a parabolic trough. The advantage of these materials lies in their high mechanical strength, corrosion resistance and low density compared to metals. Additionally, their high stiffness allows longer troughs so that the number of pylons and tracking units can be reduced, which reduces costs. The stiffness of GRP pipes combined with lightweight structure allows the use of weaker foundations and monitoring mechanisms. A lightweight structure is also less susceptible to deformations generated by its own weight. In addition, light structures reduce the energy demand for collector tracking.Item Application et adaptation de la triangulation de Delaunay pour la reconstruction de surfaces = Surface reconstruction using and adapting Delaunay triangulation(2004) Challali, Mohand Oulhadj; Belaidi, Idir; Mohammedi, K.; Belaidi, Abderrahmane; Ishiomin, GuyLa reconstruction intéresse plusieurs domaines d'application et de recherche. Parmi ceux-ci nous trouvons: la génération d'un modèle CAO, la simulation, l'inspection et le contrôle, l'usinage, technologie des prothèses, assistance au diagnostic médical, vision robotique et artificielle, reconnaissance de terrains,…etc. Parmi les techniques de reconstruction d’une surface, nous trouvons celle qui procède par polyèdrisation du nuage de points [Ver 98], [Var 97]. Dans ce papier, nous proposons une telle technique basée sur l’adaptation et l’utilisation de la triangulation de Delaunay en dimension 2D1/2Item Hybrid system energy management and supervision based on fuzzy logic approach for electricity production in remote areas(IEEE, 2012) Berrazouane, Sofiane; Mohammedi, K.The uncertainty of the renewable resources is a major impediment for successful implementation them for generation an electrical power to supply an isolated area. The combination of several renewable sources (wind and photovoltaic) with a diesel generator is suited to electricity supply of remote areas. The purpose of a hybrid power system is to produce energy at all times requested by consumers and if possible to produce it from renewable sources, the stochastic nature of renewable energy makes fluctuation of real power on the network therefore on the frequency. This problem can be solved or avoided by satisfying the real power supply-demand balance constraint in the hybrid energy system. Using battery bank system can increase the penetration of renewable energy and absorb the rapid fluctuation due to the stochastic nature of renewable energy, that, it increases the difficulty of managing all these systems in real time, ensuring the quality of energy supplied. The objective of this work is to propose a methodology to design a fuzzy logic controller coupling with stateflow to improve its performances.Item Solar tower plant implementation in northern algeria : technico economic assessment(IEEE, 2013) Boudaoud, S.; Khellaf, A.; Mohammedi, K.Item Performance analysis and economic evaluation of a solar power tower in Algeria(IEEE, 2013) Boudaoud, S.; Khellaf, A.; Mohammedi, K.