Research progress on thermochemical adsorption heat storage technology of porous matrix loaded hydrated salt
Xueling Zhang, Haoyun Xun, Yingfang Zhou, Qi Zhang, Rijie Li, Xuehong Wu, Tingxiang Jin
Abstract
Hydrated salt thermochemical adsorption heat storage is emerging as one of the most promising methods for efficient thermal energy storage. This review comprehensively examines recent advancements in the use of porous matrix-loaded hydrated salts for thermochemical heat storage. The various porous matrices and their characteristics are summarized and analyzed, along with the preparation methods for composite heat storage materials that use porous matrices to load hydrated salts: porous matrix impregnation method, compression-based stabilization method, and porous microsphere encapsulation method. Then, the mechanisms by which porous matrices enhance the thermal performance of hydrated salts are analyzed, with particular emphasis on improving thermal storage density, water adsorption capacity, thermal conductivity, and cyclic stability. Additionally, the impact of porous matrices on reaction kinetics and heat and mass transfer efficiency is discussed in depth. The strategy for optimizing system performance is analyzed in terms of system type, reactor type, internal structure, reactor parameters, and external conditions, with particular emphasis on the critical role of porous media in each component. This review identifies key challenges and provides recommendations for future research directions to advance thermochemical energy storage technologies.