Research progress of solar thermochemical energy storage

Abstract

Summary Solar thermal power generation technology has great significance to alleviate global energy shortage and improve the environment. Solar energy must be stored to provide a continuous supply because of the intermittent and instability nature of solar energy. Thermochemical storage (TCS) is very attractive for high‐temperature heat storage in the solar power generation because of its high energy density and negligible heat loss. To further understand and develop TCS systems, comprehensive analyses and studies are very necessary. The basic principle and main components of a solar TCS system are described in this paper. Besides, recent progress and existing problems of several promising reaction systems are introduced. Further research directions are pointed out considering the technical, economic, and environmental issues that existed in the wide application of TCS. Copyright © 2014 John Wiley & Sons, Ltd.

Cyclic Assessment of Magnesium Oxide with Additives as a Thermochemical Material to Improve the Mechanical Strength and Chemical Reaction

“…This system uses anhydrous or adsorbate materials that adsorb and desorb in a closed loop at low temperatures [4,5], though several studies on the use of certain inorganic oxides (e.g., Calcium oxide (CaO), Magnesium oxide (MgO)) have been carried out as well [6][7][8][9]. On the other hand, thermochemical heat storage is an open system, mainly used with high-temperature solar collectors [10] or in systems that recuperate waste heat from industrial processes [11]. This approach uses chemical reactions of inorganic oxides with high reaction temperatures and high heat storage densities.…”

Verification of hydrothermal stability of adsorbent materials for thermal energy storage

“…[3][4][5][6][7][8] Three classes of TES technologies are available, namely, sensible, 9 latent, 10 and thermochemical. 11 Particularly, sorption TES, belonging to the wider class of thermochemical TES, attracted a lot of attention during recent years, especially for storage at low/medium temperatures (eg, lower than 150°C). Indeed, it is characterized by high TES density and virtual no degradation of the stored heat during the storage period, since the thermal energy is stored as sorption potential between a working fluid (eg, water, ammonia) and a storage media (eg, porous sorbent, salt, and liquid solution).…”

Synthesis of Me Doped Mg(OH)2 Materials for Thermochemical Heat Storage

“…Latent heat storage, using phase change materials (PCMs), has been heavily researched and is widely used domestically and industrially. Thermochemical heat storage (TCS) is still at an early stage of laboratory and pilot research in spite of its attractive application for long-term energy storage and higher stored/released heat values [ 5 , 6 ]. Storage density, in terms of the amount of energy per unit of volume, is important for optimizing the use of these kind of materials [ 7 ] as it is relevant to their transportation and application in concentrated systems [ 6 ].…”

“…Thermochemical heat storage (TCS) is still at an early stage of laboratory and pilot research in spite of its attractive application for long-term energy storage and higher stored/released heat values [ 5 , 6 ]. Storage density, in terms of the amount of energy per unit of volume, is important for optimizing the use of these kind of materials [ 7 ] as it is relevant to their transportation and application in concentrated systems [ 6 ]. In 1978, Bowery et al [ 8 ] investigated the practical feasibility of a BaO 2 /BaO system for high-temperature heat storage.…”