Investigation of high temperature packed bed TES system
With the efficient use of energy becoming an increasingly significant environmental concern, interest in hightemperature thermal energy storage systems is growing. Thermal energy storage systems can be categorized into chemical heat storage, latent heat storage, and sensible heat storage. In this study, we focused on the sensible heat storage type due to its ability to stably store and release heat at high temperatures. Among sensible heat storage methods, the packed bed type and the block and pipe type are primarily used. We conducted research on the packed bed type, which offers advantages regarding the thermocline. To theoretically understand the fundamental thermal storage mechanism, we employed a 1-D model and derived the governing equations. Through numerical analysis, we examined the temperature profiles. To investigate parametric dependency, we analyzed changes in the temperature profiles by varying solid properties such as particle size, density, and specific heat, as well as fluid properties such as velocity, density, specific heat, and viscosity. Additionally, through a normalization process, we derived solutions that can be generally applied across various conditions.