Journal of Renewable Energies <p> </p> <p> </p> <center><strong>The Journal of Renewable Energies (Revue des Energies Renouvelables)</strong></center> <p> </p> <div style="width: 100%; padding: auto; height: auto;"><center><img src="" alt="" width="310" height="400" /><br /><strong>ISSN: 1112-2242</strong><br /><strong>EISSN: 2716-8247</strong></center><center></center></div> <div style="width: 100%; padding: 10px; height: auto;"> <p> </p> <p><strong>Description</strong></p> <p>The Journal of Renewable Energies (Revue des Energies Renouvelables) is an international peer-reviewed journal published by the Renewable Energy Development Center (CDER). The journal was founded in 1998 to promote research and dissemination of knowledge on renewable energy. The Journal of Renewable Energies covers a wide range of topics that include but not limited to solar, wind, geothermal, biomass energy, hydrogen, and the environment. Particular attention is paid to energy analysis and modelling, energy conservation and storage, energy efficiency, energy demand and supply. The journal also welcomes papers on studies with an interaction between renewable energies and other scientific fields such as thermodynamics, mechanics, electricity, chemistry, biology, materials science and the protection of the environment.</p> <p> </p> <p><strong>Editor-in-chief</strong></p> <div class="name">Amar HADJ ARAB, Director of Research</div> <div class="affiliation">Renewable Energy Development Center (CDER), Algiers, Algeria</div> <div class="email"><a href="" rel="noreferrer"></a></div> <p> </p> <p><strong>Support Contact</strong></p> <p>Mohamed DEBBACHE, Senior researcher.</p> <p>Renewable Energy Development Center (CDER), Algiers, Algeria</p> <p><a href=""></a></p> <p> </p> <p><strong>Secretariat</strong></p> <p>Rafik HALALCHI</p> <p>Renewable Energy Development Center (CDER), Algiers, Algeria</p> <p><a href=""></a></p> </div> Renewable Energy Development Center en-US Journal of Renewable Energies 1112-2242 <div id="deed-conditions" class="row"> <ul class="license-properties col-md-offset-2 col-md-8" dir="ltr"> <li class="license by"> <p><strong>Attribution</strong> — You must give <a id="appropriate_credit_popup" class="helpLink" tabindex="0" title="" href="" data-original-title="">appropriate credit</a>, provide a link to the license, and <a id="indicate_changes_popup" class="helpLink" tabindex="0" title="" href="" data-original-title="">indicate if changes were made</a>. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.<span id="by-more-container"></span></p> </li> <li class="license sa"> <p><strong>ShareAlike</strong> — If you remix, transform, or build upon the material, you must distribute your contributions under the <a id="same_license_popup" class="helpLink" tabindex="0" title="" href="" data-original-title="">same license</a> as the original.<span id="sa-more-container"></span></p> </li> </ul> </div> <div class="row"> <ul id="deed-conditions-no-icons" class="col-md-offset-2 col-md-8"> <li class="license"><strong>No additional restrictions</strong> — You may not apply legal terms or <a id="technological_measures_popup" class="helpLink" tabindex="0" title="" href="" data-original-title="">technological measures</a> that legally restrict others from doing anything the license permits.</li> </ul> </div> New designs of turbulence promoters to use in saltwater purification processes <p align="justify">This paper describes a two-dimensional computational fluid dynamics (CFD) model of flow with mass transfer to simulate a membrane separation system. The fluid domain comprises two reverse osmosis (RO) membranes and is fitted with different wavy inserts that act as turbulence promoters. Four types of insert designs were evaluated in terms of salt deposition on the membranes, permeate flux, axial pressure drop in the channel, and plots of the Sherwood number against the Power number. According to numerical simulations, under the operating conditions of this investigation, the proposed designs generate better results than commercial designs. The gain in pure water flux achieves up to 2%, and salt deposition on the membrane surface is reduced by ~5% than the commercial Zigzag spacer arrangement.</p> Mounir Amokrane Djamel Sadaoui Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 1 – 7 1 – 7 10.54966/jreen.v1i1.1033 Modeling and Control Strategy for a Wind Turbine by an AG-SMC without Wind Speed Sensor <p align="justify">This work presents a control strategy for Wind Turbine (WT) power by using an algorithm of Indirect Maximum Power Control (IMPC). This algorithm is based on Tip Speed Ratio (TSR) approach, which is applied to control wind turbines. Indeed, the WT used in this study has a single mass brought back to the generator shaft. The main contribution of this study is to maximize the aerodynamic power delivered by the WT system. In fact, this maximization is carried out during partial load operation, without consideration of the disturbances caused by variations in the wind profile. In this context, the control strategy of the WT is performed by estimating the Wind Speed (WS) instead of using an anemometer. This estimation is handled by using an Adaptive Gain Sliding Mode Control (AG-SMC). For this control, the surface is chosen as an improved solution that carried out the adaptation for the sliding gain and the generator torque estimation. The results obtained in Matlab / Simulink software showed that the aerodynamic power maximum is achieved and the control algorithm IMPC is given a high efficiency in the WS estimation.</p> Meddah Atallah Abdelkader Mezouar Kheira Belgacem Youcef Saidi Mohammed Amine Benmahdjoub Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 9 – 19 9 – 19 10.54966/jreen.v1i1.1034 Coordinated Control of Wind turbine and Energy storage system for Microgrid Stability <p align="justify">In recent decades, the development of renewable energy has accelerated significantly due to several factors such as changing energy needs, the problem of global warming, and the depletion of fossil fuels. Wind energy is one of the renewable generation sources that can be used to achieve the EU's 2030 targets at a lower cost. However, its intermittent and stochastic nature could significantly impact the reliability and stability of the electricity system. Therefore, there is a clear necessity to mitigate power fluctuations to make the most of wind energy. To fill this gap, this paper presents a centralized control strategy based on a droop controller and a storage-integrated controller for a grid-connected variable speed wind power system (permanent magnet synchronous generator) (PMSG) to manage and stabilize the power output during intermittency periods. The main objective is to provide a stable U/f when a fluctuation event occurs. A grid failure scenario was tested to see how the control system behaves in the event of an unexpected fluctuation and its role in the stability of the power system under varying wind speed and load conditions. The effectiveness of the proposed control method was tested using MATLAB/Simulink on a small power system. The simulation results demonstrate the control system’s performance in the stability of the U/f during grid interruption.</p> Nasreddine Attou Sidahmed Zidi Samir Hadjeri Mohamed Khatir Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 21 – 30 21 – 30 10.54966/jreen.v1i1.1035 Parameters optimization of heterojunction ZnSe/CdS/CIGS/Si solar cells using SCAPS-1D software <p align="justify">It is required to simulate the performance of a photovoltaic solar cell performance to enhance it. Simulation optimization has the benefit of being inexpensive and straightforward, and it allows us to identify the optimum parameters that contribute to the enhancement of the cell. An alternative ZnSe/CdS/CIGS/Si structure has been presented using a solar cell capacitance simulator (SCAPS-1D). This paper aims to increase device efficiency by improving the physical characteristics of the many layers involved in cell realisation. We also tried to investigate the variation of electrical characteristics such as Voc, Jsc, <img src="" />, and FF with the changes in material parameters, notably the absorber layer thickness (CIGS, p-Si) (CIGS, p-Si). On the other hand, the temperature dependency has been simulated to guide device manufacturers to attain higher efficiency in varied temperature circumstances. The calculation result shows that excellent performance can be reached by varying the parameters, and the highest efficiency (24,94 %) of the solar cell can be reached under certain conditions, where the thicknesses of ZnSe, CdS, CIGS, and Si are 0.2<img src="" />m, 0.09<img src="" />m, 1.4<img src="" />m, and 0.6<img src="" />m respectively and for the optimal value of temperature equal to 295K.</p> Moussaab Belarbi Oussama Zeggai Souad Louhibi-Fasla Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 31 – 36 31 – 36 10.54966/jreen.v1i1.1036 A Comparative Technical-Economic Study of two Water Pumping Systems for an Isolated Community in Algeria <p align="justify">The goal of this work is to size a photovoltaic pumping system built on a brushless DC motor and without accumulators, then to evaluate its cost by comparing the latter with a pumping system powered by a diesel generator for a system of irrigation in an isolated site in the city of Saïda in Algeria, based on a technique known as the cost of the life cycle. The water pumping system is designed to irrigate an area of 8 hectares, planted with onions. Based on the results of this study, the photovoltaic pumping system is more economically viable compared to the system running on diesel.</p> Fatima Belgacem Mohamed Mostefai Yahia Miloud Aicha Belgacem Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 37 – 47 37 – 47 10.54966/jreen.v1i1.1037 Performance Analysis of the Multi-Level Boost Converter (MLBC) connected in a Photovoltaic System <p align="justify">The paper concentrates on a comparison between two DC/DC converters topologies, the conventional Boost and the Multi Level Boost Converter (MLBC), for connecting into PV systems. Several performance criteria are included as part of this comparison process for both converters under varying climatic conditions (irradiation and/or temperature). The DC/DC converters' function is to serve as an interface between PV generator and load. We apply MPPT (Maximum Power Point Tracking) control with <img src="" /> duty cycle adjustment using PWM technique for extracting the highest achievable output power from PV generator. The multilevel boost converter (MLBC), which is capable of monitoring and maintaining an equal voltage on all N output levels, along with controlling the input current. MATLAB/Simulink simulation results highlight the performance of the Multi-Level Boost Converter (MLBC) converter topology, to match the GPV voltage to the load.</p> Nacer Bouderres Abdelhak Djellad Djallel Kerdoun Azzeddine Dekhane Issam Attoui Sofiane Chiheb Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 49 – 57 49 – 57 10.54966/jreen.v1i1.1038 Conversion of fruit kernels of Algerian date palm (Phoenix dactylifera L.) into biodiesel <p align="justify">Today, renewable energies have become one of the most important concerns of the countries of the world as a result of the negative effects we have reached on the environment from our use of fossil fuels and the resulting emissions of toxic gases. It is no secret that the fields of renewable energies are very diverse, including those derived from biomass. Researchers in this field seek to diversify bioenergy sources from ethanol, biodiesel, and fuels. Biogas. Accordingly, we conducted this study using date kernel oil as a new source for biofuel extraction, and the results were as follows: oil content of 4 to 5 percent, with a very high acid number of 8.9776, which imposes on us make a reaction of esterification and transesterification. Biodiesel has a 91 percent yield and its properties are close to recognized standards compared to previous studies.</p> Ahmed Boulal Elkhadem Benmehdi Rekia Mebarki Kamel Hadri Abdelaziz Aroussi Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 59 – 64 59 – 64 10.54966/jreen.v1i1.1039 Cubist Regression, Random Forest and Support Vector Regression for Solar Power Prediction <p align="justify">At a time when the energy transition is inescapable and artificial intelligence is rapidly advancing in all directions, solar renewable energy output forecasting is becoming a popular concept, especially with the availability of large data sets and the critical requirement to forecast these energies, known to have a random nature. Therefore, the main goal of this study is to investigate and exploit artificial intelligence's revolutionary potential for the prediction of the electricity generated by solar photovoltaic panels. The main algorithms that will be studied in this article are cubist regression, random forest and support vector regression. This forecast is beneficial to both providers and consumers, since it will enable for more efficient use of solar renewable energy supplies, which intermittency makes their integration into the existing electrical networks a challenging task.</p> Souhaila Chahboun Mohamed Maaroufi Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 65 – 72 65 – 72 10.54966/jreen.v1i1.1040 MPPT Fuzzy Logic Control of a Variable Speed Wind Turbine <p align="justify">This work is focused on the control of a wind turbine system based on (PMSG). In order to enhance the efficiency of the wind turbine system, the maximum power point tracking (MPPT) control is applied to exploit the maximum power from the wind. The Fuzzy Logic controller (FLC) has been proposed and developed for the speed control. The simulation results show good performances of this control.</p> Abdeldjalil Dahbi Miloud Benmedjahed Abderrahman Khelfaoui Sara Kadi Boualam Benlahbib Houcine Guentri Nouar Aoun Abdelghani Harrag Messaoud Hamouda Ahmed Bouraiou Abdeldjalil Slimani Ammar Neçaibia Djilali Chogueur Boudjema Tidjar Abdellatif Oudran Kada Bouchouicha Samir Mouhadjer Tahar Touahri Ahmed Yassine Kadri Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 73 – 80 73 – 80 10.54966/jreen.v1i1.1041 A high degree of direct torque control applied to a grid-connected wind energy system based on a DFIG <p align="justify">This paper presents the performances improvement of a doubly fed induction generator (DFIG) driven by a wind turbine (WT) using direct torque control (DTC). However, the major drawbacks related to DTC are high torque/flux ripples that produce mechanical vibration and disagreeable noise. The use of multilevel inverters seems to be an interesting solution. A three-level voltage source (inverter) converter (3LVSI) connected to the rotor side of the DFIG is considered in this paper. The high freedom degree of the voltage vectors selection in the 3LVSI allows a control with minimal torque and flux ripples. In addition, a fuzzy logic approach is introduced, to ensure an intelligent extraction of the energy sweeping the WT blades. A variable adjustment step enables an optimal extraction in a minimum tracking time with significant reduction of oscillations in the steady state. Simulation results obtained using MATLAB/SIMULINK demonstrate the effectiveness of the 3LVSI-DTC control based on Fuzzy MPPT in the wind energy conversion system (WECS).</p> Oualid Djoudi Sofia Lalouni Belaid Salah Tamalouzt Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 81 – 91 81 – 91 10.54966/jreen.v1i1.1042 Phytochemical Screening and Assessment of The Antioxidant Activity of Bio-phenols of Olive Oil Mill Wastewater From The Cold Extraction of Olive Oil in Khenchela Region Eastern of Algeria <p align="justify">The objective of this study was to evaluate in vitro the antioxidant activity of polyphenols from olive oil mill wastewater in Khenchela region eastern of Algeria after conducting a phytochemical screening. The extraction of polyphenols was done by the maceration method. The quantitative estimate of the total polyphenols and flavonoids was evaluated by the colorimetric method. Antioxidant activity was evaluated in vitro using three tests DPPH, ABTS and FRAP and ascorbic acid as a reference antioxidant. The results obtained showed that the phytochemical screening carried out allowed us to highlight the presence of polyphenols, flavonoids, tannins and reducing sugars with large quantities, sterols and terpenoids in lesser amounts. The values of total polyphenols and flavonoids were sequential: (925.8 <img src="" /> 8.1 <img src="" />g GAE/mL) and (45.97 <img src="" /> 9.5 <img src="" />g QE /mL). The values of the antioxidant activity obtained from the three tests DPPH, ABTS, and FRAP were successively the followings: (IC50: 144.52 <img src="" /> 1 <img src="" />g/mL), (IC50: 169.6 <img src="" /> 35.3 <img src="" />g/mL) and (IC50: 248.13 <img src="" /> 10.1 <img src="" />g/mL). At the end of this study, it appears that OMW polyphenolic extract has an important antioxidant power.</p> Zakia Gueboudji Kenza Kadi Kamel Nagaz Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 93 – 99 93 – 99 10.54966/jreen.v1i1.1044 Fuzzy logic concept based MPPT technique for standalone PV system <p align="justify">This paper presents a study of an Intelligent Maximum Power Point Tracking (IMPPT) system for the Standalone PV system. The proposed MPPT technique is based on a fuzzy control concept (FLC). FLC is easy to design due it doesn’t require precise system knowledge and work well with the nonlinear systems; the obtained results were compared with the famous MPPT method (P&amp;O). According to the obtained simulation results, the proposed method gave good results compared to the P&amp;O technique, these results are shown by the low oscillation and rapid response of the proposed method, which provides the maximum transmission of power to the load.</p> Aboubakeur Hadjaissa Otmane Gahgouhi Khaled Ameur Abdelhamid Rabehi Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 101 – 107 101 – 107 10.54966/jreen.v1i1.1045 Ethanol Production by Balanites aegyptiaca Fruits Valorization in the Adrar Region of Algeria <p align="justify">Climate change is one of the biggest challenges facing the planet today. It is important to ensure access to energy to promote quality of life and economic development. It is therefore essential to address this problem in sustainable development. Advances in the development of new technologies have given hope that the goals will be attainable in the field of energy. Currently, biotechnological processes make it possible to promote this fruit of the desert date tree and make available to citizens a new generation of products with high added value such as bioethanol. In this context, various alcoholic fermentation tests at the laboratory level are carried out to determine the dilution rate, in order to optimize the process. We compared the degree of crude alcohol of four dilutions, i.e. the dilution by (six, nine, ten and eleven times) of the mass (110) g of the Balanites fruits pulp. We obtained after the distillation step, the following optimization results for the fermentation of the four substrates at different dilution than the 10-fold dilution of the substrate gave the best yield.</p> Kamel Hadri Ahmed Boulal Nawel Cheikh Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 109 – 115 109 – 115 10.54966/jreen.v1i1.1047 Future Sustainable Water and Energy Policy for Algeria <p align="justify">This paper summarises the findings of many studies and surveys in the water and energy sectors in order to make recommendations for water and energy policies in Algeria. We provide an overview of current policy concerning water, energy, and climate change. We investigate the impact of the water-energy nexus on current policy developments. We made specific proposals to aid in the integration of water and energy policies in Algeria. This study demonstrates how, in the absence of integrated policies, the inextricable historical linkages between water and electricity have given rise to spurious trade-offs between water and energy. Drought and climate change are projected to increase demand for electricity, and water sector adaptation strategies have the potential to contribute to climate change by encouraging investment in energy-intensive technologies such as desalination and enhanced wastewater treatment. The findings indicate that demand management programmes and water pricing regulations that lower water and energy intensity in important industries are likely to benefit Algeria's whole economy and environment. The findings are equally applicable to other countries confronted with the burden of developing appropriate strategies to manage their water and energy issues.</p> Ait Mimoune Hamiche Amine Boudghene Stambouli Samir Flazi Hideomil Koinuma Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 117 – 127 117 – 127 10.54966/jreen.v1i1.1048 Optimal Energy Management of Hybrid MicroGrid Using Storage System and Fuzzy-GA Method <p align="justify">Due to the increase of the demand for electrical power and the gaining of momentum of decentralized electrical production, the importance of microgrids is increasing constantly. Therefore, it is pertinent to understand how microgrids work and develop efficient systems to supervise and manage the produced electrical power. This paper deals with an optimal energy management system (EMS) for multi-sources hybrid microgrid. The investigated hybrid system incorporating Diesel Engine (DE), Photovoltaic generator (PV), Wind farm, Fuel Cells (FCs) and Electrolyzers. The proposed strategy was based on a combined optimal Fuzzy Logic and Genetic Algorithm (GA). The GA have been employed to optimize the scaling factors of fuzzy logic to give better results. The power demand variation was considered as disturbance, where, the optimal Fuzzy-GA was implemented to ensure microgrid balance. The effectiveness of the proposed strategy was demonstrated througth various scenarios, and the behavior of the microgrid was analyzed without and with storage system. The obtained results were compared and the proposed strategy proves the validity as a strong optimization tool that can cope with load variation.</p> Nour EL Yakine Kouba Slimane Sadoudi Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 129 – 141 129 – 141 10.54966/jreen.v1i1.1049 Extraction of electrical parameters for one diode photovoltaic model using quasi-oppositional Rao-1 optimization algorithm <p align="justify">Usually the model parameters of photovoltaic (PV) cells are unavailable in their datasheet provided by the manufacturers. Hence, the problem of extracting appropriate PV parameters is of high importance, and has been highly attracted by researchers. This paper presents a new method to estimate the parameters of the one diode model (ODM), namely quasi-oppositional Rao-1 optimization algorithm (QORao-1). The present method uses only addition and multiplication operations with a quasi-oppositional-based learning process, in order to improve the exploration capability of the original Rao-1 algorithm. Hence, an attractive amelioration in the Root-Mean-Square-Error (RMSE) values is acquired. Comparative performance analysis demonstrates that the QORao-1 algorithm has better performance in terms of robustness and accuracy while estimating the PV parameters than many well-known algorithms.</p> Badis Lekouaghet Sid-Ahmed Touil Chabane Boubakir Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 143 – 149 143 – 149 10.54966/jreen.v1i1.1050 Assessment Microbiological and Physicochemical Quality of Figs Dried in Adrar Region, Algeria <p align="justify">The figs are considered one of the fruits of paradise due to their great nutritional value that brings health back to the citizen, including protection from malnutrition. However, the consumption of the inhabitants of Adrar state for this fruit is very little and that is the lack of abundance in the market during the season, in addition to the rapid spoilage of this delicate fruit in case It was transported from the north due to the difficult delivery conditions, including the period and method of transportation to the province. Therefore, the solar drying team studied the preservation of this material through the solar drying method in order to preserve and store it for consumption throughout the year. In this study, the fresh figs were screened for the drying process using indirect solar, after that, the microbiological and physicochemical properties was tested in order to evaluate the nutritive value and hygienic quality of dried figs. The results revealed the presence of mesophilic aerobic total bacteria and coliform total, as well as the absence of Salmonella Typhi, Staphylococcus aureus, Clostridium perfringens, and certain yeast colonies. The pH value, activity water, dray matter, and ash assay findings were (0.41), (7.5%), (5.71%), and (5.71%), respectively, which do not impact the final quality of the dried goods and are satisfactory to the standards required by Algerian commercial legislation.</p> Akil Loumani Ahmed Amine Larbi Ahmed Mediani wafa Braham Chaouch Meriama Foullanine Cherif Tigani Abdelkrim Djaber Zahra Belkacem Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 151 – 158 151 – 158 10.54966/jreen.v1i1.1051 Study of the effect of ADL anodic diffusion layer on the performance of a direct methanol fuel cell (DMFC) <p align="justify">In this study we investigated the properties of the species diffusion layer (ADL) affect the optimal performance of the electrode [1]. Diffusion layers (DL) are porous media allowing reactive gases and liquids to move from distribution channels to catalyst layers (CC). Diffusion layers are an essential part of the PEM fuel cell and the porosity of these layers has a significant effect on the performance of the PEM fuel cell. The effects of diffusion layer porosity (ADL) on fuel cell performance are illustrated by the distribution curves of methanol and carbon dioxide at the anode, water and oxygen distribution at the cathode. and polarization curves.</p> Mihoub Medkour Mohamed Roudane Mourad Mderes Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 159 – 169 159 – 169 10.54966/jreen.v1i1.1052 Aerodynamic study of a Savonius type vertical axis wind turbine for different axial positions between the blades <p align="justify">In this work we present a numerical study on the aerodynamic behavior of a vertical axis wind turbine of the Savonius type for different axial positions between the blades (overlap rates a/D). The study focuses on predicting the effect of the axial position of the blades to the torque coefficient and also to determine the dynamic field of the flow around the wind turbine for three cases overlap rates (a/D=0, a/D=0.16 and a/D=0.32). The study of the numerical simulation is carried out using a CFD calculation code with use of the finite volume method for the discretization of the differential equations. The equations governing the flow are solved by the SIMPLE algorithm using the K-epsilon model as the closure model.</p> Habib Merouane Mohammed Senouci Ismail Drai Rachid Sahnoun Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 171 – 178 171 – 178 10.54966/jreen.v1i1.1053 Investigation, Analysis and Optimization of PEMFC Channel Cross-Section Shape <p align="justify">In this study, a three-dimensional (CFD) model is employed to simulate and optimize the CCS (Channel Cross-Section) shape of the single straight channel PEMFC. Four CCS shapes, namely trapeze, inverted trapeze, half of ellipse and inverted half of ellipse, are investigated using ANSYS-FLUENT software and compared to the rectangular and triangular CCS shapes. The results obtained from the simulation are compared to the experimental results of the literature. A good agreement is observed between the numerical and experimental results. From the obtained results, it appears that the best delivered power density is reported by the trapeze CCS configuration, whereas, the worst delivered power density is obtained by the inverted half of ellipse CCS configuration. The highest pressure-drop and pumping power are obtained with the triangular CCS configuration and the smallest are resulted by the rectangular CCS configuration. Finally, the highest net power output is reported by the trapeze channel cross-section configuration, while, the lowest one is yielded by the inverted half of ellipse CCS configuration.</p> Abdallah Mohammedi Youcef Sahli Houcine Moungar Mohammed Benhammou Hocine Ben Moussa Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 179 – 187 179 – 187 10.54966/jreen.v1i1.1054 A new adaptive MPPT design for photovoltaic system under real outdoor conditions <p align="justify">Renewable energy, especially solar photovoltaic (PV) panels, have been widely integrated into energy systems, indeed, this technology is eco-friendly and available almost everywhere. However, these systems exhibit some challenges in regards their performance. They must always track the maximum power point (MPP) to provide the highest power. This work investigates a novel maximum power point tracking (MPPT) procedure. In the suggested tracking system, a novel controller is applied to establish different operating regions. In both regions, the step is changed depending on the closeness to the MPP. Due to this technique, some disadvantages of the incremental conductance (IncCond) approach are avoided. The proposed method offers reliable and stable behaviour under rapidly changing atmospheric conditions. Moreover, it is easy as it does not need additional sensors. The theoretical assessment discussed in this investigation is validated by simulations via MATLAB/Simulink and experimental outdoor tests. A comparison with conventional MPPT approach is provided to emphasize the performance of the developed MPPT technique.</p> Salah Necaibia Ammar Necaibia Ahmed Bouraiou Mounia Samira Kelaiaia Hocine Labar Wafa Tourab Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 189 – 197 189 – 197 10.54966/jreen.v1i1.1055 Bibliometric Analysis and Challenges in Biofuel Production using Petroplants <p align="justify">A bibliometric analysis based on PubMed database were carried out to provide insights into research activities and tendencies, challenges of global biodiesel from 1997-2020.The document type and language,characteristics of publication output, keywords and most cited articles were emphasized. The biofuel production faces many challenges which include land availability, high cost, plant health and availability of labour. Data visualization using VOS viewer clearly stated that annual output of related scientific articles increased steadily. On analyzing the keywords, network visualization showed 100 lines with biofuel most related to biotechnology field.The most ideal keyword occurrence were visualized for bio-oil followed by co- digestion of biological matter are seen for density visualization. Six clustering of keywords were noted with links 20,6701 among keywords. The relevance score calculated using VOS viewer software generated 2.35 as score for Biodiesel engine and 2.25 for Organic loading rate. The analysis of review papers from pubMed clearly indicated that biofuels showed direct link to biotechnology field, plant oils and ethanol production.</p> Cherian Pinkie Jayakumar Devika PA Majidha Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 199 – 205 199 – 205 10.54966/jreen.v1i1.1056 A new algorithm described PV module’s behavior under partial shading conditions <p align="justify">The shadowing of a single cell in string leads to reverse bias of the shadowed cell. The cell acts as a load instead of a generator in order to deal with this effect and the hotspots problems, this paper focuses on the design of bypass diodes configuration and the behavior of a PV module (Suntech 85w) under partial shading divided from 36 cells into three parts of 12 cells and each part of these parts behaves like a single module, The effect of shadow has been simulated on this module, based on the transmission of shadow for a single shaded cell, before increasing the number of shaded cells for the same shadow transmittance, and the effect of the shaded on the unshaded module and those in the presence and absence of bypass diodes. The simulation results show that the consequences of the shading phenomena can be limited by this configuration and thus increase the operating efficiency of photovoltaic (PV) systems.</p> Houssem Saber Abdelouadoud Bendaoud Hammoud Radjeai Lazhar Rahmani Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 207 – 217 207 – 217 10.54966/jreen.v1i1.1057 Numerical study to predict optimal configuration of wavy fin and tube heat exchanger with various tube shapes <p align="justify">This paper aims to investigate the influence of tube shapes on thermal-flow characteristics of sinusoidal wavy finned-tube heat exchangers. Two row staggered bundle with six geometries of tubes (four flat tube geometries, one oval tube and a circular tube) are analyzed for a range of (1600 <img src=""> Re <img src=""> 4800). The inspection revealed that the heat flux and the pressure drop decrease with the tube flatness for all Reynolds values. However, the oval tube O1 reaches, for all Reynolds values, the lowest values of heat flux and pressure drop. Regarding the global performance criterion, the sinusoidal wavy fins with O1 shaped tubes reached the highest global performance values, being 14.8–24.4% and 31.6–36.3% higher than the fin with F1 and O2 tube geometry, respectively.</p> Farouk Tahrour Fares Djeffal Lyes Bordja Abdelmoumene Hakim Benmachiche Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 219 – 228 219 – 228 10.54966/jreen.v1i1.1058 Investigation of monocrystalline silicon surface texturization by image processing program <p align="justify">One of the main issues in the photovoltaic industry of silicon solar cells is the optical losses via reflection. To overcome this issue, texturization (chemical etching) remains the most commonly used method to produce a random pyramid structure to reduce reflection and thus increase photocurrent generation. Because of the anisotropic etching property of alkaline solution, square-based upright pyramids are formed, i.e., the difference in etching rates between (100) and (111) planes. In this paper, the following etching solutions were studied: 4/10, 6/6, and 10/4 (KOH weight percentage/IPA volume percentage).The optical, morphological, and electric characterizations using UV-Vis spectroscopy, electron scanning microscopy (SEM), and quasi-steady-state photoconductance (QSSPC) device are performed. Also, the standard weighted reflectance (SWR) was calculated. The pyramid size distribution generated using KOH-IPA solutions was investigated using an image processing program (ImageJ) via SEM images. The calculation of the height of the pyramids reveals that the typical pyramid size ranges from 3 to 9 <img src="" />m, with large pyramids of small proportions. Furthermore, when the pyramids are distributed in a mixture of tiny and medium pyramids in precise proportions, the reflectivity is at its lowest, and as the number of large pyramids rises, the reflectivity increases.</p> Abdellah Trad khodja Abdelkader Elamrani Faouzi Kezzoula Chahinez Nasraoui Seif-Eddine Friha Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 229 – 236 229 – 236 10.54966/jreen.v1i1.1059 Numerical analysis termal fluid in a heat exchanger with baffles inclination <p align="justify">A research on Thermo-hydraulic performance carried out on three types of heat exchanger with different baffles inclination 15°, 25°, 45° by the computer code Fluent, the model achievable is turbulence <img src="">. The results show big recirculation zones and lower temperature peaks on the outlet for the decreased angles, the average heat transfer coefficient decreased by 1 %, pressure loss decreased by 1.2%, amount of heat exchanged between the tubes and the water increases by 1.2%.</p> Ahmed Youcef Rachid Saim Mohammed Chokri Kourti Mohammed Benhamou Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 237 – 244 237 – 244 10.54966/jreen.v1i1.1060 Chaos Game Optimization Algorithm for Parameters Identification of Different Models of Photovoltaic Solar Cell and Module <p align="justify">In order to achieve the optimum feasible efficiency, the electrical parameters of the photovoltaic solar cell and module should always be thoroughly researched. In reality, the quality of PV designs can have a significant impact on PV system dynamic modeling and optimization. PV models and calculated parameters, on the other hand, have a major effect on MPPT and production system efficiency. Because a solar cell is represented as the most significant component of a PV system, it should be precisely modeled. For determining the parameters of solar PV modules and cells, the Chaos Game Optimization (CGO) method has been presented for the Single Diode Model (SDM). A set of the measured I-V data has been considered for the studied PV design and applied to model the RTC France cell, and Photowatt-PWP201 module. The objective function in this paper is the Root Mean Square Error (RMSE) between the measured and identified datasets of the proposed algorithm. The optimal results that have been obtained by the CGO algorithm for five electrical parameters of PV cell and model have been compared with published results of various optimization algorithms mentioned in the literature on the same PV systems. The comparison proved that the CGO algorithm was superior.</p> Mohamed Zellagui Samir Settoul Claude Ziad El-Bayeh Nasreddine Belbachir Copyright (c) 2022 Journal of Renewable Energies 2022-06-21 2022-06-21 245 – 259 245 – 259 10.54966/jreen.v1i1.1061