Abstract
Abstract Solar thermal power generation requires great heat storage devices and systems, and thermal storage materials significantly affect the efficiency of heat storage systems. A ceramic matrix is used for encapsulating the phase change materials (PCMs), aimed to improve the heat storage performance of the PCMs. In present study, we focused on the effect of the core-shell structure with molten salt as core and porous ceramic as shell on their thermal property in the heat storage units instead of molten salts adsorbed on porous ceramics. In addition, the SiO2 nanoparticles with large specific heat, high thermal conductivity were evenly added in the molten salt to enhance the performance of heat storage and heat release. Experimental results show that the proposed approach enable the heat storage units to gain a superior operating temperature range, and the analysis indicates that the spatial and temporal distribution of temperature satisfies the compound exponential correlation, and the corresponding natural convection velocity is estimated here.
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