Thermodynamic analysis of molten salt-based single-tank thermal energy storage system with heat transfer enhanced by gas injection

熔盐 热力学 传热 传热系数 热能储存 热的 对流换热 材料科学 化学 核工程 工程类 物理
作者
Sanghyun Che,Ju‐Won Kim,Jaeheon Jeon,Daejun Chang
出处
期刊:Journal of energy storage [Elsevier BV]
卷期号:77: 109959-109959 被引量:11
标识
DOI:10.1016/j.est.2023.109959
摘要

In this study, the feasibility of gas injection for enhancing heat transfer in a molten salt thermal storage system was experimentally investigated. The convective heat transfer coefficient induced by the gas injection was quantitatively measured. A predictive model was developed to estimate the heat transfer coefficient with respect to the gas injection rate. A comparative analysis between gas-injection and non-injection cases was also performed from a thermodynamic perspective to verify the feasibility of the method. The heat transfer coefficient was within the range of 359–1283 W/m2-K, depending on the gas injection rate. The developed model estimated the measured values within an average absolute error of 2%. From the comparative analysis, the gas injection method improved thermal efficiency from 86.3% to 95.1%. The energy loss induced by the gas injection was within the range of 0.2%–1.1% of the total stored energy. The gas injection also shortened the energy discharge time by 32%–41% owing to the heat transfer enhancement. The proposed method also improved the system performance by enhancing the exergy transfer rate from the salt to the water. These results indicate that a gas injection method is a potential candidate for improving molten salt thermal storage systems.
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