Browsing by Author "OTMANI.A (Encadrant)"

Now showing 1 - 5 of 5
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    CFD-Based Simulation of Natural Convection in Enclosures for Photovoltaic Module Cooling Applications
    (National Higher School of Technology and Engineering – Annaba, 2025) MADACI Younes Taki Eddine; OTMANI.A (Encadrant)
    This thesis presents a CFD-based study on improving passive cooling of photovoltaic (PV) modules using natural convection. Different configurations were simulated, including increased water layer volume, cylindrical water channels, and replacement of water with phase change material (PCM) and moist sand. Results showed that moist sand provided the best thermal regulation due to its high thermal inertia and evaporation effect. The numerical model was experimentally validated, confirming the reliability of the simulations. The study highlights cost-effective, energy-free solutions for efficient PV cooling.
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    Design and Optimization of a Combined Cooling and Heat Recovery System for Photovoltaic Panels
    (National Higher School of Technology and Engineering-Annaba, 2025) MADACI Younes Taki Eddine; OTMANI.A (Encadrant)
    The main goal of this study is, on the one hand, to develop an effective cooling system to enhance PV efficiency, and, on the other hand, to use the extracted heat in a brine preheating process, with the aim of improving the efficiency of the brine electrolysis, which has been investigated in a separate study. A set of indoor and outdoor experiments evaluated active and passive cooling techniques including a gravity-fed coil system, natural convection, Water-Filled Heat Sink, and moist sand-based evaporative cooling. Results demonstrated that effective thermal management significantly enhances PV efficiency. The moist sand configuration achieved over 20 °C temperature reduction and an efficiency gain of up to 2%, proving the potential of low-cost, energy free cooling solutions combined with heat recovery.
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    Design and Thermo-Optical Optimization of a Solar Parabolic Trough Collector
    (NATIONAL HIGHER SCHOOL OF TECHNOLOGY AND ENGINEERING -ANNABA, 2024) KHATIR Kalb Eddine; GUEDRI Mohamed Seradj Eddine; OTMANI.A (Encadrant)
    In this graduation project, we focused on the design, construction, and optimization of a Parabolic Trough Collector (PTC). Extensive efforts were made to build the PTC using various materials and innovative techniques. numerous tests were conducted to enhance the PTC performance, experimenting with single tube, double tube, and multi-pass absorber setups. The findings demonstrate a 63% improvement in thermal efficiency, validating the effectiveness of the proposed design for thermal solar energy applications.
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    Numerical and experimental study of a parabolic trough solar collector Receiver
    (HIGHER NATIONAL SCHOOL OF TECHNOLOGY AND ENGINEERING - ANNABA, 2024) KHATIR Kalb Eddine; GUEDRI Mohamed Seradj Eddine; OTMANI.A (Encadrant)
    This study presents an in-depth analysis of the Parabolic Trough Collector (PTC) system, focusing on its individual components and their performance. The research includes a comprehensive literature review and recent studies, along with an experimental case study, complemented by simulation using COMSOL Multiphysics. The objective is to evaluate the efficiency and feasibility of PTC systems for solar energy applications. Through experimental data and simulation results, this work aims to provide insights into optimizing PTC design and operation.
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    Perfectionnement du refroidissement interne d’une aube de turboréacteur RS1S : Innovation de la structure interne
    (ECOLE NATIONALE SUPERIEURE DE TECHNOLOGIE ET D’INGENIERIE - ANNABA -(EX ESTI), 2023) MILOUDI Salem; BELAHMEUR Nadji; HALIS Ikram; OTMANI.A (Encadrant)
    L'objectif principale de ce travail est l’innovation du refroidissement interne des aubes rotor de turboréacteur afin d'augmenter l'efficacité globale du moteur. Autodesk Inventor a été exploité pour la conception assisté par ordinateur de trois configurations de refroidissement interne. En fait, les trois designs proposés sont originaux, innovants et inexistants dans la littérature. De plus, une configuration de référence a été adoptée pour comparer et évaluer les performances des nouvelles conceptions. En effet, les quatre géométries ont été testé dans un modèle numérique thermo-fluide réalisé sur COMSOL Multiphysics. Après analyse des résultats, il a été découvert qu'une des nouvelles conceptions se distingue par des performances supérieures et une efficacité élevée. Cette conception basée sur l’effet d’étranglement permet à l’aube de résister aux températures extrêmes ; à cette effet un brevet d’invention a été déposé. Sur la base des résultats obtenus dans ce travail, on peut conclure que la mise en oeuvre de cette nouvelle conception conduira à une amélioration de l'efficacité des turbines à combustion et à une réduction des risques de dommages causés par les hautes empératures. On estime que cette innovation trouvera une application généralisée dans l'industrie de l'énergie et la conception des turbines à gaz, contribuant à une augmentation de l'efficacité, à une réduction des coûts de maintenance et à une amélioration globale des performances des turbines.