Development and thermochemical characterizations of vermiculite/SrBr2 composite sorbents for low-temperature heat storage

Y.N. Zhang, R.Z. Wang, Y.J. Zhao, T.X. Li, S.B. Riffat and N.M. Wajid

Energy, 2016, vol. 115, issue P1, 120-128

Abstract: Novel EVM/SrBr2 composite sorbents with different salt contents were developed for low-temperature thermal energy storage (TES). Simulative sorption experiment was conducted to obtain the sorption kinetics diagram and identify threshold salt content that composite sorbents can hold without solution leakage. Distribution of salt embedded in EVM was observed by extreme-resolution scanning electron microscopy (ER-SEM). Thermochemical characterizations including desorption performance and desorption heat were fully investigated by analyzing simultaneous thermal analyzer (STA) results. Results reveal that sorption process of composite sorbents is divided into three parts: water adsorption of EVM, water adsorption of SrBr2 crystal and liquid-gas absorption of SrBr2 solution. Since SrBr2 solution can be hold in macrospores of EVM, water uptake and energy storage density are greatly increased. It appears that the composite sorbent of EVMSrBr240 is a promising material for thermal energy storage, with water uptake of 0.53 g/g, mass energy storage density of 0.46 kWh/kg and volume energy storage density of 105.36 kWh/m3.

Keywords: Composite sorbent; Expanded vermiculite; Deliquescence; Strontium bromide; Thermal energy storage (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (27)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:115:y:2016:i:p1:p:120-128

DOI: 10.1016/j.energy.2016.08.108

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