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Variability of Performance Indices of Photovoltaic Solar Panels in Operating Conditions in the Littoral Zone of Cameroon

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Computational Water, Energy, and Environmental Engineering 2021年第3期10卷 108-116页

作者： Regine Fouda Bella Salomé Ndjakomo Essiane simon koumi ngoh Boris Fouotsap Higher Technical Teacher’s Training College of Ebolowa University of Yaoundé I Yaoundé Cameroon Laboratory of Technology and Applied Sciences The University of Douala Douala Cameroo Laboratory of Electrical Engineering Mechatronics and Signal Processing University of Yaoundé I Yaoundé Cameroon

Photovoltaic cells are generally manufactured under standard test conditions. The operating conditions, very often induce performance losses different from those initially given by the manufacturer. This article presents an experimental acquisition and analysis system that integrates the synthetic efficiency ratio (SER) as a hybrid analysis tool to evaluate the performance of a monocrystalline photovoltaic solar panel, in this case the LW-MS90 panel in the city of Douala. The meteorological data obtained experimentally was used to evaluate these performances according to the manufacturer’s model in MATLAB/Simulink. By comparison with the experimental performances, the results quantify through a certain number of indices, a minimal power drop according to the acquired irradiance estimated at 3.45%. The interest of this approach is to contribute to the prediction of the operating performance of PV panels in the installation phase in non-standard areas.

关键词： Photovoltaic Panel Performance Synthetic Efficiency

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Mathematical Modeling of Shear Stress and Direct Shear Test for Compressible Soil: Case of Soil Bordering the Wouri River

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World Journal of Engineering and Technology 2021年第3期9卷 385-406页

作者： Michael Soup Teoua Ouagni François Ngapgue Fabien Kenmogne Alain Soup Tewa Kammogne simon ngoh koumi Dschang School of Science and Technology (DSST) Department of Physics Mechanical Unit of Research and Modeling Physical Systems Energy-Mechanic University of Dschang Cameroon Dschang Cameroon Department of Civil Engineering Fotso Victor Institute of Technology University of Dschang Bandjoun Cameroon Department of Civil Engineering Higher Teacher Training College of Technical Education University of Douala Douala Cameroon Laboratory of Condensed Matter Electronics and Signal Processing (LAMACETS) Faculty of Sciences University of Dschang Dschang Cameroon Department Thermal Engineering and Energy Douala University Institute of Technology Douala Cameroon

This paper focuses on the development of the mathematical model of shear stress by direct shear test for compressible soil of the littoral region, which will be a great tool in the hand of geotechnical engineers. The most common use of a shear test is to determine the shear strength which is the maximum shear stress that a material can withstand before the failure occurs. This parameter is useful in many engineering designs such as foundations, roads and retaining walls. We carried out an experimental laboratory test of ten samples of undisturbed soil taken at different points of the border of Wouri river of Cameroon. The samples were collected at different depths and a direct shear test was conducted. The investigations have been performed under constant vertical stresses and constant sample volume with the aim to determine the frictional angle and the cohesion of the compressible soil which are so important to establish the conditions of buildings stability. Special care was taken to derive loading conditions actually existing in the ground and to duplicate them in the laboratory. Given that the buildings constructed in this area are subjected to settlement, landslide, and punch break or shear failure, the cohesion and the frictional angle are determined through the rupture line after assessed the mean values of the shear stress for the considered ten samples. The bearing capacity of the soil, which is the fundamental soil parameter, was calculated. From the laboratory experimental results, the least squared method was used to derive an approximated mathematical model of the shearing stress. Many optimizations methods were then considered to reach the best adjustment.

关键词： Direct Shear Test Normal and Critical Stresses Frictional Angle Bearing Capacity Mathematical Model

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