http://197.159.135.214/jspui/handle/123456789/17 Wed, 06 May 2026 11:36:33 GMT 2026-05-06T11:36:33Z http://197.159.135.214/jspui/handle/123456789/1164 Development and characterization of Eco-materials for sensible heat storage in concentrating solar power plants Bagre, Boubou Renewable energy is anticipated to play a vital role in the future to meet the global energy demand for low carbon transition. Solar energy presents the inherent characteristic given by the nature of the resource (intermittent availability). This observation highlights the need for thermal energy storage system. This PhD thesis was more focused on thermal energy storage for concentrating solar power plant, as well as its two essential components such as heat transfer fluid, storage materials and solar field. The analysis of the thermocline storage system and parabolic trough collector performance is achieved through the development of new thermal energy storage material, Direct normal irradiance data collection and numerical approaches. An innovative alternative solution for the storage materials consisted to use sand, clay and coal bottom ash to manufacture ceramic balls for thermal energy storage. The new material can store heat at temperature up to 610 °C. The new material showed good compatibility with Jatropha Curcas oil during 2160 h of heat treatment at 210 °C. After numerical analysis the new storage system (ceramic ball and JCO) can provide a discharge efficacy up to 94% depending on the storage tank size. In addition, Jatropha curcas oil is an innovative heat transfer fluid for parabolic trough collector (PTC) which can provide an average thermal efficiency up 83% to the collector. The connection of both TES system and parabolic trough collector (PTC) shows that a mass flow rate of 2 kgs-1 is necessary to charge a TES system of 2 12ℎ>? with a collection area of 460 m2 before 3 pm under Ouagadougou and Agadez Climate condition. So, we propose, Jatropha curcas oil as heat transfer fluid (HTF) in medium-size (up to 1 12@A) PTC plants using Organic Rankine Cycle power generation unit during 24h integrating the new TES system. It is a suitable technology in any region where the maximal DNI can reach 750 W.m-2. The originality of the new composite material for thermal energy storage combines performance, materials availability at industrial scale and waste to energy approach while reducing environmental and financial impact. A Thesis submitted to the West African Science Service Centre on Climate Change and Adapted Land Use and the Université Abdou Moumini, Niger in partial fulfillment of the requirements for the degree of Master of Science Degree in Climate Change and Energy Sat, 22 Jun 2024 00:00:00 GMT http://197.159.135.214/jspui/handle/123456789/1164 2024-06-22T00:00:00Z http://197.159.135.214/jspui/handle/123456789/1163 Renewable energy production under climate change, decentralized smart grid and sustainable energy system: Evidence in Togo Amega, Kokou West African countries’ power sector encounters interrelated problems, such as intermittent power access, lack of power security and reliability, aging distribution infrastructure, and the impact of climate change. To meet their increasing energy demand and ensure a secure and reliable electricity supply under the changing climate, a resilient sustainable energy system is to be developed and promoted. Accordingly, the current research seeks to create an enabling environment that will permit the development of a sustainable electric power system model that is climate-resilient and compatible with the Togolese power system. This case study enables energy security through energy efficiency promotion, clean energy development, supply quality and reliability improvement, and reduction of greenhouse gases (GHG) by increasing electricity access in Togo. To reach the objectives of the study, an integrated approach is used. Firstly, Sandia method-assessment approach is applied to develop a typical meteorological year (TMY) as an alternative solution for data issues in renewable energy (RE) studies. Secondly, the impact of changing climate (CC) on decentralized power resources (solar energy) technology and generation potential has been conducted based on energy rating and photovoltaic cell (monocrystalline, polycrystalline and amorphous) temperature models at the national level under RCP2.6 and 8.5 scenarios. Finally, the existing power system networks are thoroughly investigated based on expert elicitation and modelled with Simscape-MATLAB/Simulink in view of a Smart Grid (SG) development considering the penetration of renewable energy (RE). Results showed a very low installed RE (hydro and solar) capacity of 11.27% from 2015 to 2020. The generated TMY predicts PV system performance within 2% of the datasets at all sites. Regarding the impact of CC, PV cells’ temperature would likely rise across all five regions in the country and may trigger a decline in the PV potential under RCP2.6 and 8.5. However, the magnitude of the induced change depended on two major factors: (1) PV technology and (2) geographical position. These dissimilarities were more pronounced under RCP8.5 with amorphous technology. The Togolese power sector is characterized by a number of issues including limited supply, technical issues regarding transmission and distribution (power losses due to aging infrastructures), and power outages. Therefore, the power system is modeled in view of its transformation to increase supply and improve reliability and resiliency. A Thesis submitted to the West African Science Service Centre on Climate Change and Adapted Land Use and the Université Abdou Moumini, Niger in partial fulfillment of the requirements for the degree of Master of Science Degree in Climate Change and Energy Mon, 01 May 2023 00:00:00 GMT http://197.159.135.214/jspui/handle/123456789/1163 2023-05-01T00:00:00Z