The International Journal of Energetica
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Item 4E (Energy-Exergy-Economic-Environmental) performances assessment of different configurations of power cycles(جامعة الوادي - university of el oued, 2021-10-30) Meriche, slem; Chemoul, Adem; Boukelia, Taqiy EddineSteam power plants are alimented by different sources of energy including fossil fuels or renewable ones such as solar thermal, biomass or geothermal. Thus, thermodynamic, economic and environmental analyses of different steam power cycles are highly required for identification and choice of the most effective and viable layout to be adopted in the installation. Consequently, the main aim of the present paper is to compare five different configurations of power cycles in terms of energy and exergy efficiencies, fuel and cooling water consumptions, CO2 emissions rate, as well as investment and operating costs, and net present value (NPV). The obtained results present relevant differences; the energy and exergy efficiencies of the fifth configuration similar to the one of Achouat power station are the highest with 41.9% and 39.5% respectively. On the other hand, this configuration shows better environmental performances represented by CO2 emission (46.12 kg/s), and water consumption for cooling (7.42 m3/s). Economically, there is a clear convergence in the NPV values for configurations with Reheating and Regeneration processes. Moreover, the fourth configuration is the best in terms of net present value (NPV) of 103.1(M€).Item Analysis for inter turn stator fault with load variation in Induction Motor(جامعة الوادي Université ofEl-Oued, 2023-06-15) Cherif, Hakima; Maamir, Madiha; Chehaidia, Seif EddineThis paper investigates the impact of load variation on the diagnosis of inter-turn stator faults in induction machines. The proposed detection technique relies on the analysis of stator current using the discrete wavelet transform (DWT) in both normal and faulty states of the machine. The energy of the approximation and detail signals obtained from DWT provides valuable information about the machine's health and the severity of the inter-turn stator faults. Experimental tests were conducted using a dSpace 1104 signal card-based interface to study the load effects in detecting and diagnosing stator inter-turn short circuit faults in induction motorItem ANFIS Models for Fault Detection and Isolation in the Drive Train of a Wind Turbine(جامعة الوادي - university of el oued, 2022-12-25) Zemal, Zakariai; Cherroun, Lakhmissi; Hadroug, HafaifaThe paper aims to improve the fault detection and isolation process in wind turbine systems by developing intelligent systems that can effectively identify and isolate faults. Specifically, the paper focuses on the drive train part of a horizontal axis wind turbine machine. The proposed fault diagnostic strategy is designed using an adaptive neural fuzzy inference system (ANFIS), which is a type of artificial neural network that combines the advantages of both fuzzy logic and neural networks. The ANFIS is used to generate residuals that occur after faults have been detected, and to determine the appropriate thresholds needed to correctly detect faults. The simulation results show that the proposed fault diagnostic strategy is effective in detecting faults in the drive train part of the wind turbine system. By using intelligent systems such as ANFIS, the fault detection process can be automated and streamlined, potentially reducing maintenance costs and improving the overall performance and efficiency of wind turbine systems.Item Bioclimatic approach of passive cooling techniques for the design of buildings in southern Algeria(جامعة الوادي - university of el oued, 2021-06-03) Hebbal, Belkhir; Yacine, Marif; Kaddour, Abdelmadjid; Belhadj, MustaphaThe bioclimatic approach looks into the opportunities for building conception under the local climatic conditions. The first bioclimatic chart has been developed by Olgyay which combines temperature with relative humidity to characterize the comfort zone. It is founded on outside climate conditions to identify attenuation measures such as solar radiation, wind speed, or shading to reach comfortable inside conditions. Givoni created also a bioclimatic chart founded on inside conditions using the physical and thermal properties of air. Bioclimatic approach strategies contribute to decreasing the building energy loads and increasing thermal comfort for its residents over the year. The principal aim of this research is to evaluate a bioclimatic approach to passive cooling for building design in Algeria's South using Givoni's Bioclimatic chart and Olgyay's Bioclimatic chart. Climate data of various locations (Ouargla, Ghardaia, and El Oued) within this area were collected and analyzed. Furthermore, an overview of appropriated conception strategies for the hot season for each zone is developed. The results show that the maximum average temperature from June to August at around 43.1°C. After applying passive cooling strategies, the temperature indoor can be decreased from about 26.1 to 31.4°C, which can be described as being in the comfort zone for the three studied locations. Finally, these findings can contribute to understanding the thermal behavior of residential buildings and offer guidelines to develop a convenient concept of what the building composition should look like in arid and hot climates.Item Cellulose cardboard effect on the performance of a conventional solar still(جامعة الوادي Université ofEl-Oued, 2023-05-12) Bellila, Abderlkader; Rahal, Zakaria; nichenko, anichenko; Sadoun, AliThe lack of drinking water is a pressing issue in contemporary times, and solar distillation stands out as a simple and effective solution. However, the low yield of solar distillation remains a challenge. Researchers have undertaken various experimental modifications to enhance the thermal performance of solar distillation. In one such modification, Cellulose cardboard was introduced with the aim of improving the system's performance. The experimental results demonstrated a notable improvement of 19.8% in the solar still's efficiency when Cellulose cardboard was employed, compared to conventional solar still designs.Item CFD simulation of natural convection and heat transfer in a flat solar thermal collector with fins on the glazing - horizontal case(جامعة الوادي - university of el oued, 2018-12-06) Laaraba, AdelThis study is based on a CFD simulation of a flat horizontal solar thermal collector containing fins on its inner face of the glazing. The walls of the solar collector with insulation are considered adiabatic and the rest of the walls are at constant different temperatures. The principal objective of this work is to study the effects of the number of fins that changed from 0 to 30, as well as their length varied from 0 to 0.8 on the air flow and heat transfer characteristics. It has been observed that the heat transfer rate is strongly affected by the number of fins and the length of the fins. The obtained result showed that the increase of the fins reduces the heat loss by convection by 54 %.Item Comparative Study Between Fuzzy and Sliding Mode Control Based on a BDFIG(جامعة الوادي - university of el oued, 2019-12-15) Ouada, Laid; Sebti, BBrushless doubly fed induction (BDFIG) is one of the best solutions of the previous research efforts about wind-power converter, which is represented by the absence of a brush gear and less maintenance cost, especially in the harsh regions. This task presents a comparative evaluation between a sliding mode and Fuzzy control. It demonstrates also the robustness of these two regulators against supply voltage and load disturbances. Furthermore, we have shown the undesirable phenomenon of oscillations having a finite frequency and amplitude, which is known as ‘chattering’ resulted from a sliding mode control which is based on Lyapunov approach theorem. The control of the system and BDFIG are both integrated in variable speed wind energy conversion. The performances of these control systems have been tested and analyzed in Matlab SimulinkItem Comparative study between pi and fuzzy pi controllers for DFIG integrated in variable speed wind turbine(جامعة الوادي - university of el oued, 2019-12-15) Mesai, H; Bentaallah, A; Djeriri, Y; Mahmoudi, AThis paper presents the contribution of the application of fuzzy logic for the independent control of the active and reactive power stator of a doubly fed induction generator (DFIG), used in a variable speed wind energy conversion system. So in this work, we are particularly interested in the application of indirect vector control by stator flux orientation to the DFIG, based on fuzzy controllers. These latter surpass the limits of conventional controllers and possess essential characteristics for the improvement of the robustness of the vector control with against parameters variations of the system. The obtained simulation results have shown that it is possible to control the stator powers, even in the presence of parametric variationsItem Comparative Study between Sliding Mode Control and the Vectorial Control of a Brushless doubly fed induction generator(جامعة الوادي - university of el oued, 2018-12-17) Oussama, Moussa; Rachid, Abdessemed; Said, Benaggoune; Benguesmia, HaniBrushless doubly fed induction generators (BDFIG) show commercial promise for wind-power generation due to their lower capital and operational costs and higher reliability as compared with doubly fed induction generators. This paper proposes a robust sliding mode control of grid-connected brushless doubly fed induction generator (BDFIG). The developed algorithm is based on the decoupling control by using oriented grid flux vector control strategy. The decoupling of the active and the reactive stator powers insures an optimal performance of the BDFIG at the sub-synchronous region. The stator of this machine incorporates two sets of three phase windings with different number of poles, power winding (PW) and control winding (CW). The proposed method is tested with the Matlab/Simulink software. Simulation results illustrate the performances and the feasibility of the designed controlItem Continuous Nonlinear Model Predictive Current Control of PWM AC/DC Rectifier(جامعة الوادي - university of el oued, 2021-12-22) Merzouk, Imad; Bessous, Noureddine; Rezaoui, ,Mohamed MounirThe present work applies a nonlinear model predictive current control (NLMPCC) approach to ac/dc pulse width modulation (PWM) rectifier. A cascade structure is used to regulate Dc-link voltage and grid currents. The outer loop objective is to regulate the Dc-link voltage to the desired value, providing the level of the required active power to be used with the reactive power to calculate the referencing current for the inner loop. In the inner loop, the proposed approach is considered. After that, the nonlinear model of the converter is developed, based on continuous minimization of predicted tracking errors, the voltage at the terminal of the converter is deduced. After that, a PWM block is used to generate gate signals. Simulation results are performed to illustrate the efficiency of the proposed control lawItem Control of 3x7 matrix converter with PWM three intervals modulation(جامعة الوادي - university of el oued, 2019-12-15) Mesai, H; Bentaallah, A; Djeriri, Y; Mahmoudi, ADirect Power conversion from fixed AC voltage into variable AC voltage is gaining a significant attention, especially in case of multi-phases machines/generators; for such reason a new algorithm to control 3x7 matrix converter (MC) is developed in this paper, wherein the main aim is to control multi-phases induction motor/generator connected to the electrical grid with a novel converter (except matrix converter), for that the PWM three intervals modulation strategy is modified from the control of 3x3 MC to 3x7 MC; which is directly connected to the network through a three phase input in order to overcome the supplying problems, on the other side seven phases have been used as an output to benefit the advantages of the multi-phases machines. This paper intends in the first place to explain the 3x3 MC, then to manipulate the control equation for the purpose of making it suitable for controlling the 3x7 MC effectively, thus a good performance can be clearly seen according to the quality of the output voltage/current under typical R-L load, the shift between phases and the THD evaluation. The obtained simulation results which demonstrate the efficiency of the new control algorithm are presented and discussedItem Control with Sliding Mode of a Five-Phase Series-Connected Two-asynchronous Motor Drive(جامعة الوادي - university of el oued, 2018-06-28) zouaid, zouaid; i nezli, LazhariIn this paper, we study sliding mode control of series-connected five-phase two asynchronous machines supplied with a three levels inverter. After presentation of multiphase machines, we worked out the mathematical model of five phase asynchronous machine supplied with voltage inverter. Application of Park transformation reduces considerably the mathematical model of machine. After, we applied vector control and sliding mode control to the five-phase induction machine. After that, we study a multi-machine system, which comport five-phase two asynchronous machines supplied with a single voltage inverter. In the last, we had the sliding mode control of series-connected five-phase two asynchronous machines. Simulations are presented to show the effectiveness of the control strategy. We observe that an appropriate transposition of phase’s order permits an independent control of two machines.Item Detection and Diagnosis faults in Machine asynchronous based on single processing(جامعة الوادي - university of el oued, 2019-04-20) Chouidira, Ibrahim; Khodjae, Djalal Eddine; Benguesmia, HaniIn this work, we proposed multi-winding model for the simulation of broken bars in squirrel cage asynchronous machine, this model allows to study the influence of the broken bar defects on the behavior general of machines in different operating conditions (healthy and faulty). The breaking of the most frequent bars of the rotor causes oscillations of the torque, speed, and the current, the increase of the resistance of the rotor creates the defects proportional with the number of breaks bar K .The diagnosis fault using technique of single processing based on Spectrum analysis for detection broken bar. The results of the simulation obtained allowed us to show the importance of this technique for detection broken barItem Developed nonlinear model based on bootstrap aggregated neural networks for predicting global hourly scale horizontal irradiance(جامعة الوادي Université ofEl-Oued, 2023-05-06) Dahmani, Abdennasser; Ammi, Yamina; Hanini, Salah; Driss, ZiedThis research study examines the use of two models of artificial intelligence based on a single neural network (SNN) and bootstrap aggregated neural networks (BANN) for the prediction value of hourly global horizontal irradiance (GHI) received over one year in Tamanrasset City (Southern Algeria). The SNN and BANN were created using overall data points. To improve the accuracy and durability of neural network models generated with a limited amount of training data, stacked neural networks are developed. To create many subsets of training data, the training dataset is re-sampled using bootstrap re-sampling with replacement. A neural network model is created for each set of training datasets. A stacked neural network is created by combining multiple individual neural networks (INN). For the testing phase, higher correlation coefficients (R = 0.9580) were discovered when experimental global horizontal irradiance (GHI) was compared to predicted global horizontal irradiance (GHI). The performance of the models (INN, BANN, and SNN) demonstrates that models generated with BANN are more accurate and robust than models built with individual neural networks (INN) and (SNN).Item Direct torque control of a doubly fed induction generator(جامعة الوادي - university of el oued, 2017-05-25) Ben Amar, A; Belkacem, S; Mahni, TIn this paper a direct torque control system is proposed and is applied to doubly fed induction generator (DFIG) based wind power generation systems. In this control system the rotor flux and the electromagnetic torque are estimated based on the rotor voltage and currents measurements. The validity and effectiveness of this control is demonstrated by some simulation results.Item Dynamic modelling of an earth-to-air heat exchanger for air cooling on the building in hot temperate climate of Beni Mellal Morocco(جامعة الوادي - university of el oued, 2021-06-15) Arroub, IsmailIsmail; Bahlaoui, Ahmed; Belhouideg, Soufiane; Kaddour, AbdelmadjidIn this article, we examined the passive cooling techniques built into a building in hot temperate climate. Our work aims to reduce the energy demand for cooling and progress the thermal comfort of building by decreasing overheating hours. The dynamic simulations of the energy performance in a building with an earth-air heat exchanger (EAHX) are performed in the summer period using TRNSYS software. The building is situated in Beni Mellal city (Morocco) where the climate is a hot temperate one. The results of the simulations show a significant potential for air cooling. Indeed, for the hottest day of July (retained for this study), when the outside temperature is 44.8 °C and the cooled temperature (inside) is 29 °C, the difference of 15.8 °C is obtained. Also, an evaluation of the relative humidity is provided. Finally, we recommend that the Moroccan thermal code encourage the use of passive cooling techniques; precisely in temperate climate.Item Economic and Technical Evaluation of LifePO4 Production using Hydrothermal Method(جامعة الوادي - university of el oued, 2020-12-01) Chairunnisa, Alya; Wulandari, Sarah Ayu; Salsabila, Shafa; Putri, Silmi Ridwan; Nandiyanto, Wulan MaryamThe aim of this study is to evaluate the economic and engineering layout carried out on a factory scale LiFePO4 production using the hydrothermal synthesis method. The method used is economic evaluation by calculating gross profit margin (GPM), payback period (PBP), break-even point (BEP), internal rate return (IRR), cumulative net present value (CNPV), return on investment (ROI). , and the profitability index (PI). LiFePO4 was synthesized using precursors FeSO4.H2O, ascorbic acid and H3PO4 and then reacted with LiOH2.2H2O by maintaining the Li: Fe: P molar ratio of 3: 1: 1. The results of GPM and CNPV calculations from the manufacture of industrial scale LiFePO4 show that the payback period (PBP) has increased in the fourth year. LiFePO4 applications on an industrial scale can be used for lithium ion batteriesItem Economic Evaluation Analysis of Nano-silica Ultrafiltration Membrane Production from Sand(جامعة الوادي - university of el oued, 2018-06-20) Kurnia, Asep Bayu Dani Nandiyanto Asep Bayu Dani Nandiyanto; Riska, Ismiati.AinnayaIsmiati.Ainnaya; Ainnaya, AnnisaAnnisa; Fiona, Finandia Finandia; Nissa, Noor NazmiNoor Nazmi Aulia; Dewi, Rita ChintiaThe purpose of this research was to analyze the production method of a membrane of silica nanoparticles from an economic perspective. Silica nanoparticles are synthesized using a coprecipitation method. Briefly, the process consists of immersion, heating, precipitation, washing and drying, and packaging. The parameters used for economic analysis are gross profit margin (GPM), internal rate return (IRR), payback period (PBP), cumulative net present value (CNPV), break-even point (BEP), and profitability index (PI). The production of this ultrafiltration nano-silica membrane can be done by varying the amount of initial sand from 6 to 14 kg. The production of ultrafiltration nano-silica membranes can be produced in both domestic and micro-scale industries. To get a very good profit, economic analysis shows the minimum amount of sand used should be more than six kg. This study is very important because the production of ultrafiltration nano-silica membranes have a high potential in the field of economics and will encourage further investigation for the possibility of industrial production of these ultrafiltration nano silica membranes.Item Economic evaluation of zinc oxide nanoparticle production through green synthesis method using Cassia fistula plant extract(جامعة الوادي - university of el oued, 2020-12-15) Fatmarin, Zahra; Utami, Fidya AhdiatiFidya Ahdiati; Girsang, Gabriela Chelvina Santiuly; Mulya, Sri Zahra Mina Setyani; Fentiana, Vina Dian; Putri, Yashinta Kirana; Nandiyanto, Asep Bayu DaniThe purpose of this study was to determine the feasibility of a zinc oxide (ZnO) manufacturing project through a green synthesis method using plant extracts Cassia fistula and then evaluate it from an engineering and economic perspective. Several economic evaluation parameters are analyzed to inform the potential production of ZnO nanoparticles, such as the length of time required for an investment to return the total initial expenditure (PBP), the condition of a production project in the form of a production function in years (CNPV), project benefits and so on. The results showed that the production of ZnO nanoparticles was very prospective. Technical analysis to produce 250 kg of ZnO nanoparticles per day shows the total cost of the equipment purchased to be 21,450.00 USD. PBP analysis shows that investment will be profitable after more than three years. This project can compete with PBP capital market standards because of the short investment returns. To ensure the feasibility of a project, the project is estimated from ideal conditions to the worst case in production, including labor, sales, raw materials, utilities, and external conditions.Item Economic Perspective in the Production of Copper Nanowire using Amino Acids as Capping Agent(جامعة الوادي - university of el oued, 2019-12-25) Rezaoui, Mohamed Mounir; Bessous, Noureddine; Merzouk, ImadThe purpose of this study is to evaluate the economic feasibility of making copper nanowire using amino acids as a capping agent. The evaluation was conducted from two perspectives, namely engineering analysis and economic evaluation using parameters such as gross profit margin, payback period, breakeven points, and net present value. An economic evaluation was also carried out comparing the use of amino acids Glycine, Lysine, Proline, and Alanine to find out which amino acids were more profitable in the production of copper nanowire. Furthermore, the evaluation is done by estimating the ideal situation and several other state assumptions such as changes in raw material prices, labor costs, and also income tax. From the results of this study, Glycine is known as the most profitable amino acid to be used in this process. In addition, by using Glycine as an ideal condition, based on the results of the evaluation of all parameters, this project is classified as prospective to do. Although further studies must be carried out to develop this project, this study can be the basis for developing new methods of making copper nanowire on a large scale.