Research on the high-temperature service performance of solid electrothermal energy storage devices and system design
FAN Changzhe
DU Yongbo
LIU Dongming
ZHANG Ruoyuan
LIANG Xu
CHE Defu
Abstract：The heat exchange performance of the solid heat storage system directly affects the thermal output power of the system and the efficiency of the heat storage and release cycle.Among them,the structure of the heat storage duct is a key factor.For a specific solid heat storage duct structure,the Fluent software is used to simulate and study the heat storage and release characteristics of the heat storage module in the solid electroheat storage device,analyze the influence of the duct structure,and conduct thermal calculations for the matching conditions of the main components of the device.The results show that after 8 h of heating,the average temperature of the heat storage body increased from 300.00 K to 1 008.64 K,the maximum temperature difference in the same cross-section is 2.57 K,and the heat storage capacity of the heat storage module reached 1 482.08 kWh.During the heat release process,the U-shaped duct heat transfer structure enables the air to stay for a longer time.Air with an initial temperature of 300 K passing through the U-shaped heat storage body of the initial temperature of 765 K for heat release can reach an outlet air temperature of up to 577.01 K.The thermal calculations of the system obtained key parameters such as the surface load of the heating wire 11.4 W/m2,the heat exchange area 255.5 m2,and the fan power 7.5 kW.The study shows that the dual-channel structure can significantly improve temperature uniformity and heat exchange efficiency,providing a reference for the design and operation optimization of the solid electroheat storage system.
Keywords：solid thermal storageventilation duct structurethermal calculationnumerical simulation
Publication Date：2026-01-31
Online Publishing Date：2026-03-11(First online date of this platform, not the publication date of the document)
Pages：6( 72-77 )