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Journal of Sustainable Bioenergy Systems 2020年第2期10卷 52-61页

作者： Sokhna Khadidiatou Ben Thiam Alassane Ba Mamadou Babacar Ndiaye Issa Diagne Youssou traore Seydou Faye Cheikh Thiam pape touty traore Ablaye Fame Gregoire Sissoko Ecole Polytechnique de Thiès (EPT) Thiès Senegal University Institute of Technology University of Thiès Thiès Senegal Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal

Convective heat transfer coefficients, materializing exchanges between solid wall (here typha) and its environment, influence its behavior under excitation pulse. Temperature of wall and its density of flow vary with these coefficients according to its thickness (in depth). This study therefore focuses on the evaluation of convective heat transfer coefficient on front face and the optimal insulation thickness.

关键词： Typha Heat Transfer Coefficients Spectroscopy Optimal Insulation Thickness

Study at Two Dimensions of Thermal Transfer through a Fibers Panel Subjected to Climatic Constraints in Dynamic Frequency Regulations Established

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Energy and Power Engineering 2020年第5期12卷 135-142页

作者： Mohamed Sidya Ould Brahim Issa Diagne Mamadou Babacar Ndiaye Youssou traore Seydou Faye Cheikh Thiam pape touty traore Ablaye Fame Sokhna Khadidiatou Ben Thiam Gregoire Sissoko Laboratory of Semiconductors and Solar Energy Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal University Institute of Technology University of Thiès Thiès Senegal

From resolution of two-dimensional equation of heat in dynamic frequency regime, we have plotted evolution curves of temperature according to depth of material or in lateral direction. They will allow us to evaluate thermal behavior of towed material. Aim of study is to use fibers as a thermal insulating material by proposing a method for determining effective thermal insulation layer in dynamic frequency regime.

关键词： Thermal Transfer Heat Exchange Coefficient Frequency Dynamic Regime Fibers

Influence of the Magnetic Field on the Transient Decay of the Density of Charge Carriers in a Silicon Photocell with Vertical Multijunctions Connected in Series Placed in Open Circuit

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Energy and Power Engineering 2022年第12期14卷 747-761页

作者： Papa Monzon Alassane Samake Papa touty traore Babou Dione pape Diop Fatimata Ba Mamadou Wade Physics Departement Cheikh Anta Diop University Dakar Senegal Polytechnic School of Thies Water and Environmental Science and Technology Laboratory Thies Senegal

This study investigates the effect of the magnetic field on the transient density of excess minority charge carriers in the base of a series-connected vertical junction silicon solar cell. The solar cell is presented in open circuit transient operation. The magnetic field through the Laplace force which deflects the photogenerated carriers from their initial trajectory towards the lateral surfaces reducing their mobility, diffusion and conduction, will certainly influence the decay time of the transient regime. The transient density of excess minority carriers in the base is a sum of infinite terms whose decay time of the different harmonics is studied.

关键词： Silicon Solar Cell-Series Vertical Junction Recombination Velocities Magnetic Field Base Thickness (P) Eigenvalues Decay Time Constant

Comparative Studies on Reflection Defect between Textured and Planar Surface Based on TCO Materials

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Energy and Power Engineering 2022年第10期14卷 550-557页

作者： Alassane Diaw Papa touty traore Awa Dieye Physics Department Cheikh Anta Diop University Dakar Senegal

This article presents, on the one hand, the performance of ARC by configurations ITO/Si, MgO/Si, and GeO2/Si. On the other hand, we study the impact of thickness on the reflection of OCTs, because the thickness of OCTs plays an important role on the optical properties and the variation of the reflection and transmission of TCO/Si heterojunctions as a function of thickness is also sown. And the last part of the paper, we will make a comparative study between the performance of silicon textured on the front side and that of silicon where the front side is planar. These two forms of silicon will be covered with ARC. For this, we will use the following materials ITO, MgO, and GeO2 and we represent the variation of the reflection of CAR on a planar surface and on a textured surface as a function of the wavelength. The results show that the reflection is low in textured surface compare to the planar surface.

关键词： Reflection TCO Textured Surface

Effects of the Shading Rate on the Electrical Parameters of CIGS-Based Solar Modules

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Energy and Power Engineering 2021年第12期13卷 483-491页

作者： El Hadji Abdoulaye Niass Papa touty traore Awa Dieye Oumar Absatou Niasse Pierre Tavarez Nacire Mbengue Zakaria Makir Zouhair Sofiani Bassirou Ba Physics Department Faculty of Science and Technology University Cheikh Anta Diop Dakar Senegal Physics Department Faculty of Science and Technology of Mohmammadia Laboratory Laboratory of Materials and Energy and System Control University Hassan II Casablanca Marocco

The aim of this article is to study the effects of the shading rate on the electrical performance parameters of CIGS PV modules. The study concerns a new flexible CIGS type photovoltaic module with a power of 90 W, manufactured by the company Shenzhen Shine Solar Co., Ltd. This module, reference SN-CIGS90, is tested under the initial conditions to ensure its correct operation and to determine the initial values of the electrical parameters before shading. After this characterization test, the module is exposed under the actual operating conditions of the Renewable Energies Study and Research Center (CERER), located in Dakar, then 4 types of shading are performed with the same mask: partial shading 25% partial shading, 50% partial shading, 75% partial shading, and 100% full shading. The variation rates obtained on the experimental values of the 4 types of shading carried out determine that the shading phenomenon constitutes a factor that influences negatively on the electrical parameters of a CIGS-based PV module. Indeed, for 25% of the surface of the shaded module, there is a reduction of 58.139% of the maximum power and of 60.507% of the efficiency and for shading of 100%, the module loses 84.436% of its maximum power and 84.135% of its performance.

关键词： Modulus Shading Rate Electrical Parameters Mask