化工进展2024，Vol.43Issue(8)：4210-4221,12.DOI:10.16085/j.issn.1000-6613.2023-1218
三套管式加肋相变蓄热单元的强化传热特性
Analysis of enhanced heat transfer characteristics of finned triplex-tube phase change heat storage unit
摘要
Abstract
Phase change heat storage technology plays an important role in using industrial waste heat and solar energy to solve the imbalance between supply and demand between heat energy and users.Due to the limitation of the physical properties of the phase change material,there are still problems such as low heat storage rate and uneven melting during heat storage and melting.In this paper,the effects of different parameters(number of fins,length,thickness,eccentricity and fin arrangement)of adding longitudinal fins on the heat storage performance of triplex-tube phase change heat storage unit were simulated by FLUENT software under the action of natural convection.The results showed that the heat exchange area was increased compared with the ordinary casing heat storage unit,and the time required for all the phase change materials to melt was shortened.Under the same number of fins,the length and thickness of the fins were the main factors affecting the heat storage unit and the average heat storage rate,when the fin length accounted for 50%of the radial length of the phase change material area,the melting speed of the heat storage unit was significantly accelerated and the heat storage and average heat storage rate were higher.Through the optimization design,it was found that the downward offset distance e of the inner tube had a significant effect on the melting process of the phase change material,and the heat storage unit with short eccentric distance took the least heat storage time,compared with the smooth tube heat storage unit,the melting rate of the phase change material was increased by 48.5%,and the heat storage time was extended if the offset distance was too long.Through the arrangement of the outer fins at the bottom of the infill heat storage unit,the melting process of the heat storage unit was accelerated to varying degrees,and the overall heat storage rate was improved compared with the original fin structure.关键词
相变蓄热/数值模拟/强化换热/传热肋片/潜热存储单元Key words
phase change heat storage/numerical simulation/enhanced heat exchange/heat transfer fins/latent heat storage unit分类
能源科技引用本文复制引用
蒋静智,邵国伟,崔海亭,李洪涛,杨奇..三套管式加肋相变蓄热单元的强化传热特性[J].化工进展,2024,43(8):4210-4221,12.基金项目
国家自然科学基金(51706058) （51706058）
河北省自然科学基金(E2019208345). （E2019208345）
