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

作者：Zhang, Y. N.; Wang, R. Z.^*; Zhao, Y. J.; Li, T. X.; Riffat, S. B.; Wajid, N. M.

来源：Energy, 2016, 115: 120-128.

DOI：10.1016/j.energy.2016.08.108

• Composite sorbent
• Expanded vermiculite
• Deliquescence
• Strontium bromide
• Thermal energy storage

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 EVMSrBr(2)40 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 10536 kWh/m(3).

• 出版日期2016-11-15
• 单位上海交通大学