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The thermal energy storage (TES) technology has gained so much popularity in recent years as a practical way to close the energy supply–demand gap. Due to its higher energy storage density and long-term storage, thermochemical energy storage (TCES), one of the TES methods currently in use, seems to be a promising one.
Recently a new trend focusing on thermal systems applied to buildings has emerged. Most of the reviewed articles on thermal storage refer to STES and LTES. PCMs related to thermal energy storage show the highest number of research studies, while thermochemical systems are scarce .
In the case of thermochemical systems, the most studied area focuses on the development of new compounds to achieve the required energy density, high temperature applications in concentrated solar power plants and their application to buildings for seasonal storage.
Thermochemical energy storage (TCES) 4.1. Functioning of TCES TCES employs materials which release or store heat during reversible exothermic and endothermic chemical reactions, involving dissociation or sorption mechanisms .