Composite based on lithium chloride and highly porous silica gel for adsorptive heat storage systems

A.V. Cherpakova, A.D. Grekova and L.G. Gordeeva

Energy, 2025, vol. 321, issue C

Abstract: Adsorption Heat Storage is an emerging technology that can address the time mismatch between energy supply and demand, thus offering effective use of low-temperature heat from renewable sources. In order to enhance the efficiency of heat storage systems, development of advanced adsorbents with large sorption capacity under operating conditions of a specific working cycle is required. Composite sorbents "Salt in a porous matrix" are promising materials in terms of sorption capacity and tuneability of sorption properties. This article presents a new composite based on LiCl inside a silica gel with a large pore volume (Vp ≥ 2 cm3/g), which allows embedding as high as 42 wt% LiCl. The composite demonstrates high sorption capacity of 0.53 gH2O/gads and high energy storage capacity 1.4 kJ/g under conditions of a daily adsorption heat storage cycle. The sorption dynamics was investigated by Large Pressure Jump and Large Temperature Jump methods. Heat transfer coefficients of 170 and 225 W/(m2K) are evaluated for adsorption and desorption stages, respectively. The values of the specific power of the heat release and storage in the considered cycle are calculated as 3.1 kW/kg and 5.8 kW/kg, respectively. These results show a high potential of the new composite for heat storage.

Keywords: Highly porous silica gel; LiCl; Composite sorbent; Water; Adsorption heat storage (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:321:y:2025:i:c:s0360544225010771

DOI: 10.1016/j.energy.2025.135435

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