Thermal performance analysis of a thermocline thermal energy storage system with FLiNaK molten salt

International Conference on Energy Engineering and Environmental Protection 2016

能源学;生态环境科学

Liu, C.^1,2 ; Cheng, M.S.^1 ; Zhao, B.C.^1,2 ; Dai, Z.M.^1

Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai

201800, China^1

University of Chinese Academy of Sciences, Beijing

100049, China^2

关键词: Heat transfer characteristics;    High temperature molten salts;    Numerical investigations;    Temperature profiles;    Thermal characteristics;    Thermal performance analysis;    Thermal storage units;    Thermocline thermal energy storages;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/52/1/012039/pdf
DOI  :  10.1088/1742-6596/52/1/012039

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

A thermocline thermal storage unit with a heat transfer fluid (HTF) of high-temperature molten salt is considered as one of the most promising methods of thermal storage due to its lower cost and smaller size. The main objective of this work is to analyze the transient behavior of the available molten salt FLiNaK used as the HTF in heat transfer and heat storage in a thermocline thermal energy storage (TES) system. Thermal characteristics including temperature profiles influenced by different inlet velocities of HTF and different void fractions of porous heat storage medium are analyzed. The numerical investigation on the heat storage and heat transfer characteristics of FLiINaK has been carried out. A comparison between two different molten salts, FLiNaK and Hitec, has been explored in this paper with regards to their charging and discharging operations. The results indicate the system with FLiNaK has a greater energy storage capability, a shorter charging time and a higher output power. The numerical investigation reveals heat storage and heat transfer characteristics of the thermocline TES system with FLiNaK, and provide important references for molten salt selection of the TES system in the future.