Papers by Thierry Sikoudouin Maurice KY
Solar energy, Apr 1, 2024
Atmospheric and climate science, Dec 31, 2023
A numerical approach to heat and mass transfer in a large water reservoir is presented. This wate... more A numerical approach to heat and mass transfer in a large water reservoir is presented. This water reservoir is likened to a parallelepiped reservoir whose vertical and lower walls are adiabatic and impermeable. The equations that govern natural convection in water are solved by the finite volume method and Thomas'salgorithm. The adequacy between the velocity and pressure fields is ensured by the SIMPLE algorithm. We are going to evaluate the water losses by evaporation from three dams in the Nakanbé basin in Burkina Faso for a period of thirty years, that is to say from January 1, 1991, to March 15, 2020. The three dams have a rate of evaporation greater than 40% of the volume of water stored. Indeed the rate of evaporation in each dam increases with the water filling rate in the reservoir: we have observed the following results for each dam in the Nakanbé basin; for the date of 02/27/1988 to 03/13/2020., the Loumbila dam received a total volume of stored water of 22.02 Mm 3 and 10.57 Mm 3 as the total volume of water evaporated at the same date. At the Ouaga dam (2 + 3), it stored a water volume of 4.06 Mm 3 and evaporated 2.03 Mm 3 of its storage volume from 01/01/1988 to 05/07/2016. Finally, with regard to the Bagré dam, it stored 745.16 Mm 3 of water and 365.13 Mm 3 as the volume of water evaporated from 01/01/1993 to 03/31/2020.
Physical Science International Journal, Feb 17, 2021
Aims: This paper is about a solar collector made of hemispherical concentrators. This collector i... more Aims: This paper is about a solar collector made of hemispherical concentrators. This collector is sun tracking free, and used for natural convection. Lenses are used on top of each concentrator to improve its efficiency. Study Design: The Solar collector is made of hemispherical concentrators with Fresnel lenses axially-centered to those concentrators and placed on top of each one of them. Those concentrators are covered with a 4 mm glass for a greenhouse effect. The concentrators generate hot spots that heat the inside air. There is no need for receivers at the hot spots. Methodology: from Inlet to outlet, temperatures are measured as well as inlet air speed, which allow the efficiency evaluation. Results: Although those measurements were conducted in a cloudy period, temperature difference Original Research Article
Indian journal of science and technology, Apr 11, 2022
Objectives: In sunny regions, chimney solar power plants are a promising technology because they ... more Objectives: In sunny regions, chimney solar power plants are a promising technology because they depend mainly on solar energy. However, chimney solar power plants require an optimal design of the power plant components to improve its reliability and scalability. As the collector is one of the essential components of the solar chimney power plant, this study presents an experimental study that aims to improve the thermo-aerodynamic parameters of the airflow involved. Methods: We used mini hemispherical concentrators in the collector as an innovation and the experimental conditions are those of a dry tropical zone during the dry season. Temperature and velocity were measured during a measurement campaign. Findings: The analysis of the results showed an improvement of the thermo-aerodynamic parameters, in particular the air temperature in the collector and its velocity in the chimney, with maximum values reaching 78.35 • C and 2.87 m/s respectively. We also note an improvement of the thermal field of 24.4 % and the dynamic field of 58.6% compared to a conventional solar chimney model of the same dimensions. A thermal efficiency of 68.88 % was achieved. These values highlight the innovation relevance and the performance improvement of the solar chimney prototype.
Contemporary engineering sciences, 2021
This article is distributed under the Creative Commons by-nc-nd Attribution License.
Arabian journal for science and engineering, Mar 21, 2019
In this publication, a hemispherical concentrator, containing a transparent component of refracti... more In this publication, a hemispherical concentrator, containing a transparent component of refractive index n 2 greater than or equal to the refractive index n 1 of the surrounding environment and having a flat diopter on its upper side, is studied. Then a hemispherical concentrator built in the same way as the previous concentrator but with a hemispherical diopter on its upper side is also studied. A comparison with the Rawlemon spherical concentrator is finally made by drawing the local, global geometric and geometric mean concentrations curves of all these systems. The medium n 1 is air with a refractive index n 1 = 1, while the medium n 2 is varied: 1 (air-like), 1.33 (water-like) and 1.5 (glass-like). In conclusion, a flat diopter on a hemispherical concentrator reduces the receiver positioning hour and declination angles, while a hemispherical diopter on a hemispherical concentrator increases the geometric and geometric mean concentration of the system.
Open Journal of Applied Sciences
The objective of this work is to numerically determine the thermal performance of the parabolic c... more The objective of this work is to numerically determine the thermal performance of the parabolic cylinder cooker commonly "blazing tube". These performances were determined by establishing heat balances at the different levels of the system. The equations obtained have been discretized; simplifying assumptions have been made to facilitate their resolution. We adopted Gauss Seidel's method using MATLAB software to solve these equations. The temperatures of the coolant, the glass and the absorber were determined as a function of time and along the tube. The thermal efficiency was also determined. It emerged that the different temperatures evolve linearly as a function of the length of the tube. Yield and temperatures depend on the amount of sunshine.
Physical Science International Journal
The evaluation of the solar deposit is essential for the sizing of photovoltaic systems. This req... more The evaluation of the solar deposit is essential for the sizing of photovoltaic systems. This requires the availability of radiation data. In Burkina Faso, weather data doesn’t cover all the country. That makes that solar radiation measured are not available for the all country. Theorical methods can help about it. This paper is written to fill the gap of adapted solar models for the country. In this work, an analysis of the results provided by four models for the estimation of hourly values of global radiation on a horizontal plane was made. The radiation data for the year 2017 comes from the Burkina weather forecast. The validation of the models is carried out by a comparison between the radiation measured and that given by the various models provided by MATLAB code. The different models have been validated by several statistical indicators (RMSE and normalized MAE) and graphs for a clear sky. Scoring criteria have been established to assess the relative quality of each model. T...
Indian Journal of Science and Technology, 2021
Objectives: We present in this study a modeling of thermal laminar convection airflow in a solar ... more Objectives: We present in this study a modeling of thermal laminar convection airflow in a solar tower. Methods: To formulate with precision, the boundary conditions of the solar chimney model chosen, the Cartesian equations are transformed into hyperbolic coordinates. An orthogonal grid is elaborated. It then makes it possible to draw up the diagrams of physique and calculation fields. The computer code uses the heat equation, the vorticity, and the stream function formalism as the boundary conditions for pressure are difficult to set. We use the Boussinesq approximation, which consists in considering that the density (ρ) of the fluid varies only in the term of the gravity forces, whose variations with temperature, assumed to be linear, generate natural convection. These variations are then translated into an equation of state which relates density to temperature. The system of dimensionless equations is solved by using an intégro-interpolation method referring to finite differences scheme. Findings: The solutions obtained from the dimensionless equations enabled us to determine the space evolution parameters (temperatures and velocities) in the tower according to the Rayleigh number. The fluid temperature and velocity evolution in the collector increase when one moves in the direction of radius decrease. The fluid temperature evolution in the chimney showed that the highest temperature is located at the chimney base while we obtained a parabolic profile of the transverse temperature distribution within the chimney. Finally, the evolution of the fluid velocity in the chimney showed that there was a preferred zone for turbine installation. Novelty : The use of dimensionless geometric parameters is unique and in general, the approach adopted in this paper differs from that encountered in the literature.
Indian Journal of Science and Technology
Sustainable Energy-Water-Environment Nexus in Deserts
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Papers by Thierry Sikoudouin Maurice KY