This study investigates the use of micro-Concentrated Solar Power (CSP) systems for heating applications in African countries, with a focus on optimizing the efficiency of solar receivers. The research examines the impact of receiver designs and emphasizes the role of solid particles in enhancing thermal energy absorption. As heat transfer fluids and thermal energy storage materials, solid particles are crucial for improving system performance [1]. To analyze the flow of solid particles and their thermal interactions, a thermal discrete element method (DEM) simulation was employed, based on the thermal engine of Yade-DEM as developed in [2]. A key innovation in this study is the incorporation of dynamic openings, which regulate particle flow and significantly increase particle residence time within the receiver. This mechanism improves heat exchange efficiency by allowing particles to remain in the system longer, thereby maximizing thermal energy retention. The study aims to provide valuable insights into the design and optimization of CSP receivers for efficient heating applications in regions with abundant solar resources, contributing to the development of sustainable energy solutions across Africa.