Publications Scientifiques

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Author: search.filters.author.Mohammedi, Kamal

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    Energy and environmental performance analysis of grid-connected photovoltaic systems under similar outdoor conditions in the saharan environment
    (2020) Deriche, Mohammed Amine; Hafaifa, Ahmed; Tahri, Ali; Mohammedi, Kamal; Tahri, Fatima
    The aim of this paper is to present a one-year performance analysis of four grid-connected PV systems installed at Ghardaia city in Algeria’s Sahara. The grid-connected PV systems are based on four different PV module technologies which are: monocrystalline silicon (m-Si), multi-crystalline silicon (mc-Si), cadmium telluride (Cd-Te) and amorphous (a-Si) PV module technologies. The PV systems based on the thin film technologies have their performance ratio better throughout the year when the performance ratio of the mc-Si technology is better in the winter season. The a-Si PV system has its performance ratio about 6.13 % more better than mc-Si and 8.90 % better than m-Si. The AC energy produced with the a-Si PV system is 13.32 % more than what the mc-Si system produces. It was found that the a-Si PV system performs better than the other technologies under the Saharan climate conditions of Ghardaia city. The energy payback time (EPBT) and greenhouse gases (GHG) emissions of the different PV systems were analyzed. The EPBT and GHG emissions per year, vary from a minimum value of 2.8 years to a maximum value of 5.73 years and from 13.24 tons to 32.03 tons of CO2/kWh for CdTe and m-Si respectively. The CdTe PV system performs better in terms of EPBT and GHG emissions compared to the other technologies (m-Si, mc-Si and a-Si) due to its low life cycle energy requirement.
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    Wind flow simulation and characteristics prediction using WAsP software for energy planning over the region of Hassi R’mel
    (Taylor and Francis, 2021) Meziane, Fares; Chellali, Farouk; Mohammedi, Kamal; Nouicer, Ilyes; Kabouche, Nourdine
    In this study, we analyzed the wind potential of Hassi R’mel (Algeria) under the Wind Atlas Analysis and Application Program (WAsP) environment, using data measurements at a height of 10 m provided by the National Office of Meteorology (NOM) over the period of 14 years (2003–2017). The results are used as input for predicting wind characteristics (speed and direction) for four other sites covering the studied region where the measurement stations are not available. The pre-feasibility study of large-scale energy and hydrogen production focuses on four sites, namely Telghemt, Delaa, Bouzbier, and Bellil. Two different wind turbine models, Bonus B54 and Nordex N100 with a rated power of 1000 kW and 2500 kW, respectively, were selected. The study pointed out that the region of Hassi R’mel has an important wind potential with an annual mean wind speed of 6.73 m/sec and power density of 365 W/m2 at 10 m. The maximum of energy and hydrogen produced occurs for the site of Hassi R’mel with 12.41 GWh/yr, and 177.37 tons H2/yr, with minimal costs of 5.5 c$/kWh, and 18.42 $/kg H2 respectively using Nordex N100 wind turbine at 100 m. Similarly for the site of Bellil where the maximum of energy and hydrogen production of 5.395 GWh/yr, and 77.08 tons H2/yr were obtained with minimal costs of 5.06 c$/kWh, and 17.12 $/kg H2 respectively using Bonus B54 wind turbine at 60 m. Therefore, the high rate of carbon dioxide (CO2) emissions avoided by N100 was 5428.2 tons CO2/kWh for Hassi R’mel, and 2359.2 tons CO2/kWh for Bellil using the B54 wind turbine
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    Performance evaluation of A-Si and CdTe solar photovoltaic using energy and exergy analysis
    (Inder Science, 2020) Deriche, Mohammed Amine; Hafaifa, Ahmed; Mohammedi, Kamal
    In the paper, analysis and a comparative study of exergetic performance has been made for amorphous silicon and cadmium telluride solar PV array in Oued N'echou at Ghardaia, Algeria (32°36′2.43″N of latitude; 3°42′6.32″E of longitude). The experimental data of solar radiation, ambient temperature, wind speed, module temperature, DC power (of the inverter of 96kWac) were measured and recorded for a typical day of December (21 December 2015) to evaluate the exergy and energy conversion efficiency. Applying the first law of thermodynamic and the second law of thermodynamic, the energy and exergy analyses for both PV arrays have been carried out. Exergy efficiency of amorphous PV array varied from 4.84% to 6.90% and varied from 6.25% to 10.85% for cadmium telluride during the day. The energy conversion efficiency curve of both PV arrays were found to be below that of exergy efficiency
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    Modelling and simulation of solid particle sedimentation in an incompressible newtonian fluid
    (Springer, 2017) Zouaoui, Salah; Djebouri, Hassane; Bilek, Ali; Mohammedi, Kamal
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    Assessment of solar thermal tower technology under Algerian climate
    (Elsevier, 2017) Yamani, Noureddine; Khellaf, Abdallah; Mohammedi, Kamal; Behar, Omar
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    Generation de trajectoires d’outils : une approche simplifiée pour le calcul des intersections de surfaces subdivisées
    (2005) Belaidi, Idir; Iloul, Amrane; Mohammedi, Kamal; Ishiomin, Guy
    Dans ce papier, le problème de calcul d’intersection surface/surface intervenant lors de la génération de trajectoires d’outils en fraisage par contournage de surface gauches est considéré. A cet effet, nous proposons une approche simplifiée, basée sur une technique de subdivision récursive auto-adaptative, opérant sélectivement telle que la discrétisation effective d’un carreau de surface à usiner n’ait lieu qu’exclusivement au niveau des carreaux de surfaces où une intersection peut réellement exister. En outre, pour faciliter la procédure de vérification de l’existence d’intersections, le carreau de surface est assimilé à un plan dont la spécification géométrique de planéité est utilisée comme critère d’arrêt de la subdivision. Enfin, le calcul d’intersections «carreau de surface subdivisé / plan de coupe » est ramené à un problème simple de géométrie plane où les carreaux de surface sont assimilés à des quadrilatères représentés par leurs pôles respectifs
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    Algorithmique pour la conversion par approximation de courbes de Bézier degré élevé : le modèle de rationnelle
    (2004) Asma, Farid; Belaidi, Idir; Mohammedi, Kamal; Ischiomin, Guy; Challali, Mohand Oulhadj
    Potential CADCAM applications of approximate conversion of degree élévated curves and surfaces may be numerous, but this requier the improved algorithms. To this effect, we introduce in this paper developpements of efficients algorithms to convert degree elevated Bézier rational curves, which caracterised by a minimal approximation error, reduced time of calculations and restricted number of spline curves. Besides, they offer a suitable flexibility by model transformations, without sophisticated calculations. The inverse algorithm for degree elevation of Bezier curves and the minimisation of the square norm in the Benstein polynomials basis are used for the degree reduction process, which is resolved by variable separation strategy in order to evoid the use of nonlinear methodes
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    Etude par l’application de la méthode SPH pour la simulation des instabilités hydrodynamique de Taylor-Dean
    (2012) Tebib, Walid; Aomar, Ait aider; Mohammedi, Kamal; Belaidi, Idir; Chahine, Ali
    Après des milliers de contributions, les expériences exécutées dans le système de Taylor-Couette ont confirmé une analyse théorique qui a conclu qu'il suffit d’un nombre fini d’instabilités, deux ou trois, pour mener l’écoulement au chaos ou à la turbulence faible. Beaucoup d’effets géométriques sont considérés par les chercheurs. Dans cette étude, nous avons complété les résultats expérimentaux et numériques (CFD) établis par une modélisation et une simulation à l’échelle mésoscopique à l'aide de la méthode SPH