Oyedepo, Sunday O.Abam, Fidelis I.Ajayi, Oluseyi O.Samuel, Olusegun D.Borca-Tasciuc, Diana-AndraPopoola, Abimbola P. I.2024-08-062024-08-062024-03-082296-598Xhttps://hdl.handle.net/20.500.14519/465In this industrial and technological age, energy plays a principal role in sustainable development. This is connected to issues regarding availability, production processes, utilization, and environmental impact. Due to the increased rate of population growth, the energy demand in the entire world is getting to the level that it may not be sustained in the nearest future if drastic action is not taken to address the situation, especially from research and development perspectives. "None of the millennium development goals (MDGs) can be completed without considerable improvements in the quality and quantity of energy services in developing countries," according to the United Nations Development Programme (UNDP). Based on this fact, UNDP is making efforts, especially in developing countries to ensure that people have access to sustainable sources of clean, reliable, and affordable energy since every aspect of human development is highly impacted by this vital resource. Currently, the available energy conversion systems have limited efficiencies, high operating costs, and environmental effects. Sustainable energy systems are expected to minimize the impact on the environment during their design and operation, to provide economically affordable energy to maximize their benefits to a large population and help mitigate emissions to the environment. This Research Topic welcomes high-quality submissions (original research or review articles) that address issues related to the design, analysis, and improvement of the various energy conversion systems. The aim of this Research Topic is to cover innovative development, and recent and novel research trends focused on the improvement of the operational performance (technical, economic, and environmental) of energy conversion systems (gas/steam power plants; wind turbines; solar thermal system; biomass energy systems, etc.). In addition to original articles, high-quality review papers will be considered for possible publication. Areas to be covered in this Research Topic may include, but are not limited to: • Thermal energy systems: performance and optimization; • Thermionic energy conversion systems; • Assessment and optimization of renewable energy systems – solar thermal, hydro-power system, wind turbine, OTEC, biomass energy system; • Multi-generation energy systems; • Thermo-electric energy conversion systems.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Energy systemsEnergy optimizationDesignThermodynamic analysissustainabilityArticle