IJE_Vol 08 N 02
Permanent URI for this collectionhttps://dspace.univ-eloued.dz/handle/123456789/35187
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Item Technical Performance of Grid-Connected Rooftop Solar PVs(University of Eloued جامعة الوادي, 2023-11-28) Asigri, P.Boafo Effah ,F. Opoku , D. Kwegyir , D. Kweku Eshun,A. Owiredu , Asantewaa.. Bin , B. Shafiyu M. -Roy Ekow , S. DeThis paper presents a comprehensive analysis of the technical performance of gridconnected rooftop solar photovoltaic (PV) systems deployed in five locations along the solar belt of Ghana, namely Sakumono, Wa, Bolgatanga, Kumasi, and Kintampo. These locations were selected based on their diverse environmental conditions, offering a representative sample for the study. The study utilized PVSyst software version 7.3 to simulate the performance of the PV systems for each location, using south orientation, which gives the best results in the tilted global irradiation across all locations. According to the simulation results, the average performance ratio for the five locations was 79.7%, indicating the PV systems' highly efficient utilization of the available solar energy. The average final yield, representing the actual energy output, was also measured to be 4.38 kWh/kWp/day for the studied locations. This study demonstrates the technical feasibility of Ghana's grid-connected rooftop solar PV installations. The results underscore the significance of optimal system design and orientation, emphasizing the potential for substantial renewable energy generation. The insights obtained from this study can aid policymakers, investors, and solar energy stakeholders in making informed decisions to promote the widespread adoption of rooftop solar PV systems in the regionItem Principal Component Analysis-Based Shading Defect Identification and Categorization in Standalone PV Systems Using I-V Curves(University of Eloued جامعة الوادي, 2023-12-12) Atiyah ,HayderDakhil . Boukattaya ,Mohamed. Ben Salem,FatmaPhotovoltaic (PV) system health monitoring and fault diagnosis are essential for optimizing power generation, enhancing reliability, and prolonging the lifespan of PV power plants. Shading, especially in PV systems, leads to unique voltage-current (I-V) characteristics, serving as indicators of system health. This paper presents a cost-effective and highly accurate method for detecting, diagnosing, and classifying shading faults based on real I-V data obtained through electrical measurements under both healthy and shaded conditions. The method leverages Principal Component Analysis (PCA) to separate classes, and a confusion matrix assesses classification accuracy. The results demonstrate a success rate exceeding 98% in various configurations, using experimental data from a 250 W PV module. Importantly, this method relies solely on existing electrical measurements, eliminating the need for additional sensors, making it both efficient and cost-effective.Item Optimizing Small Wind Turbine Blades: A BEMT Approach(University of Eloued جامعة الوادي, 2023-11-23) Sithole , T. Snyman, L.W. Veeredhi , V.R.Sithebe T,This paper explores the optimization of small wind turbine blades, focusing on the design and utilization of theoretical algorithms such as computational fluid dynamics (CFD), blade elementary method (BEM) theory, and the vortex wake system (VWS). Among these methods, BEM theory has proven to be the most effective in optimizing horizontal-axis wind turbine (HAWT) blades and is commonly employed in modeling and constructing small wind turbine blades. The study centers on designing and optimizing aerofoils to enhance rotor blade pitch angles and determining the optimal number of blades for maximizing power output at various wind speeds using BEMT. Using a NACA-4412 type aerofoil as the starting point, the paper investigates different pitch angles, blade radii, and chord lengths for Designs 1, 2, and 3. Results indicate that at an average wind speed of 0 - 2.3 m/s (8.28 km/h), 3-blade, 5-blade, and 7-blade sets were designed and optimized for performance. The predictions suggest rated outputs of 7.5 W, 20 W, and 40 W for Designs 1, 2, and 3, respectively. The study reveals that Design 3, with a blade radius of 1m, a chord length of 0.1m, and a pitch angle ranging from 12° near the rotor hub to 2° at the blade radius tip, achieved a significant power output of 39.5 W at a wind speed of 4.2 km/h. The findings contribute valuable insights into optimizing wind turbine blade design for enhanced energy efficiencyItem Optimizing Parabolic Through Collectors for Solar Stills: A 2D CFDParametric Analysis(University of Eloued جامعة الوادي, 2024-11-04) Bouhelal , Mammar . Rouag , Mammar . Bouhelal,Abdelhamid . Belloufi , YousefThe thermal efficiency of parabolic trough collectors (PTCs) is influenced by various parameters, including length, diameter, and mass flow rate. This study employs 2D steady-state Computational Fluid Dynamics (CFD) simulations to investigate heat transfer within PTCs and enhance their performance. Exploring diverse PTC designs, involving variations in length (L = 0.5 to 3 m) and diameter (D = 10 to 60 mm), sourced from existing research to optimize desalination system applications. The investigation covers both laminar and turbulent regimes with fully developed flows, examining the effects of Reynolds number and mass flow rate. The results highlight that collector diameter has the most pronounced impact on thermal efficiency, followed by mass flow rate, while the effect of length can be neglected in comparison. A 50% diameter increase leads to over a 60% rise in efficiency for both laminar and turbulent cases, whereas a 60% decrease in mass flow rate corresponds to a 50% enhancement and a 60% improvement in efficiency for both regimes. These findings suggest that an optimal PTC design should prioritize a smaller diameter and lower mass flow rate, with length being of secondary importance and application-specific considerations also playing a pivotal role.Item Numerical and experimental characterization of internal heat and mass transfer during convective drying of papaya (Carica papaya L.)in a drying air stream(University of Eloued جامعة الوادي, 2023-12-12) Armel ,Fouakeu-nanfack Gildas.Kewou Serge. Felix,Ngouem Junior. Abraham,Tetang Fokone. Edoun Marcel. Zeghmati BelkacemThis work consisted of simulating convective heat and mass transfers during the drying of papaya in a parallel air stream. The aim of this work was to simultaneously couple the two-dimensional heat and mass transfer equations in the product in order to predict the drying kinetics of the papaya. These papaya slices were arranged on a rack with a length (L) of 30 cm and thickness (E) of 5 mm. The Luikov equations thus established for this model were discretized using the implicit finite difference method and then solved simultaneously using the Matlab 2014 tool. Simulations of papaya drying were performed under the influence of drying air temperature (40, 50, and 60 °C), drying air velocity (0.5, 1 and 1.76 m/s), relative air humidity (20, 40, and 60%), and product thickness (4, 5, and 6 mm). The numerical simulation results allowed the prediction of the temperature and humidity distributions inside the product during the drying process. The predicted data from this model were compared to the experimental data. The results showed agreement between the predicted and experimental data with average relative errors of 5.21% and 4.35% for moisture ratio and product temperature, respectively.Item Fuel Consumption Estimation via Bookkeeping Method for Geostationary Satellites: Case Study and Application(University of Eloued جامعة الوادي, 2024-12-12) Badis Tarek- Benfriha Elhassen - BenmansourJalal Eddine.This work focuses on the Satellite Propulsion Subsystem (UPS), a critical aspect of satellite technology that can be supported by various propulsion types: electrical, chemical, cold gas, and nuclear propulsion. For communication satellites, chemical propulsion emerges as the most suitable option due to its simplicity and lower energy requirements. The chemical propulsion subsystem comprises oxidizer and fuel tanks, gas pressuring tanks utilizing helium. Wherein, Thrusters are employed for diverse tasks, encompassing tank sinking, orbital maneuvers (correction), attitude control, and deorbiting. These processes induce propellant consumption from orbit transfer to the deorbiting operation. The satellite's mission life hinges on propellant quantity, emphasizing the need to maintain sufficient reserves for deorbiting at satellite’s end of life. Thus, accurately estimating propellant mass becomes a crucial task. This work delves into propellant mass estimation methods, specifically Bookkeeping (BKP). Moreover, we introduce and test a developed tool based on the Bookkeeping method. This tool proves instrumental in estimating the remaining propellant, offering a valuable resource for satellite mission planning and longevityItem Cooling Effect on a solar still condenser(University of Eloued جامعة الوادي, 2024-11-20) Smakdji , N. Khelassi-Sefaoui,A.Bourdim,M.Siqueira,AA data logging system has been deployed to monitor two solar panels positioned at distinct inclination angles. This system records crucial parameters such as current, voltage, solar radiation incident on the panels, and panel temperatures. Comprising an Arduino microcontroller, a current sensor, a current and voltage sensor, and a Memory Card, the data logger captures and stores data in .txt files at 20-minute intervals. Employing a real-time acquisition system, the obtained results indicate that the data logger effectively archives and presents a wealth of information about solar panel characteristics. Notably, the data reveals superior performance of the solar panels at a 35-degree tilt angle compared to 32 degrees during April in the Ouargla region of AlgeriaItem Cooling Effect on a solar still condenser(University of Eloued جامعة الوادي, 2023-11-20) Smakdji , N. Khelassi-Sefaoui,A.Bourdim,M.Siqueira,AThis research delves into the quantitative impact of design modifications on solar still performance, specifically examining the role of fins on the glass cover. Comparative analyses were conducted on two solar stills, SSref (Solar Still reference) and SSmod (Solar Still modified with fins), considering temperature variation, energy transfer, energy evaporation, hourly water output, and internal efficiency. SSmod consistently exhibited superior performance, maintaining lower temperatures (peak difference of 10 °C), achieving an average energy transfer of 555 W/m², a higher energy evaporation rate (335 W/m² on average), and an increased hourly water output (0.59 mL peak). The internal efficiency for SSmod averaged 0.741%, surpassing SSref's 0.713%. These quantified results highlight the crucial contribution of fins in enhancing distillation processes, providing a valuable foundation for designing solar stills with improved energy efficiency and resource utilization