Research progress of thermochemical heat storage materials of hydrated salts

doi:10.19799/j.cnki.2095-4239.2019.0223

Abstract

Abstract:

According to research on thermal energy storage, salt hydrates are effective thermochemical heat-storage materials that store low- and medium-temperature heat for long periods. Salt hydrates store and release heat through reversible dehydration and hydration reactions. This paper describes the types and properties of salt hydrates and introduces progressive research on pure salt hydrates, composite salt hydrates, and binary salts. Pure salt hydrates have high theoretical heat storage densities, but their practical applications are limited by deliquescence, strong corrosiveness and poor cycling stability. To improve their heat- and mass-transfer properties, pure salt hydrates can be filled into porous materials. Recently, high-performance binary mixtures of salt hydrates have been developed. Furthermore, binary salt hydrates have been filled into the pores of porous materials, providing composite materials with high heat-storage density and good cycling stability. The thermochemical heat-storage materials of salt hydrates can be optimized from two perspectives: heat and mass transfer enhancement of composite materials and optimal composition of binary salt hydrates.

Key words: salt hydrates, thermochemical heat storage, composite salt hydrates, binary salts, heat storage density

CLC Number:

TK 512.3

HAO Maosen, LIU Hongzhi, WANG Wantong, LYU Jing. Research progress of thermochemical heat storage materials of hydrated salts[J]. Energy Storage Science and Technology, 2020, 9(3): 791-796.

Figures/Tables 9

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