肋片结构对三套管式潜热储能系统相变储能特性影响的研究  

Research on the influence of fin structure on phase change energy storage characteristicsof triplex tube latent heat storage system

作　　者：李兵 姜昌伟[1] 许智 亓俣权 钱发 李光伟 LI Bing;JIANG Changwei;XU Zhi;QI Yuquan;QIAN Fa;LI Guangwei(School of Energy and Power Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学能源与动力工程学院,湖南长沙410114

出　　处：《能源工程》2024年第5期44-53,共10页Energy Engineering

基　　金：国家自然科学基金资助项目(11572056,51674042)。

摘　　要：潜热储能在近恒温条件下具有高能量密度的特性,可以有效解决太阳能利用中供需不匹配的问题。本文基于焓-孔隙率法数值研究了三套管式潜热储能系统的相变储能特性,分析了肋片数量、肋片尺寸与肋片结构对相变储能过程的影响规律。结果表明,相变材料熔化速度随着肋片数量与肋片尺寸的增加而加快。直肋片数量为8,肋片尺寸分别为37.2mm和49.6mm时相变材料完全熔化时间较无肋片时分别缩短60.1%和68%,平均蓄热率分别提升141.3%和197%。与直肋片相比,Y型肋片结构相变材料熔化时间大幅缩短,其开合角度为120°时完全熔化时间仅为同换热面积下直肋片结构的60.89%,而平均蓄热率高于直肋片结构64.23%。合理布置肋片结构可缩短相变材料的总熔化时间及强化三套管式潜热储能系统相变储能特性。Latent heat storage has the characteristics of high energy density under near constant temperature conditions,which can effectively solve the problem of supply and demand mismatch in solar energy utilization.Based on the enthalpy-porosity method,this paper numerically studies the phase change energy storage characteristics of a triplex-tube latent heat storage system.The influence of the number,size and structure of fins on the process of phase change energy storage was analyzed.The results indicate that the melting rate of phase change materials increases with the increase of number and size of fins.When the number of fins is 8 and the size of straight fin is 37.2mm and 49.6mm,respectively,the complete melting time of phase change materials is shortened by 60.1%and 68%compared to those without fins,respectively,and the average heat storage rate is increased by 141.3%and 197%,respectively.Compared with straight fins,the melting time of phase change materials under the Y-shaped fin structure is significantly reduced.When the opening and closing angle of the Y-shaped fin is 120°,the complete melting time is only 60.89%of that of the straight fin structure under the same heat transfer area,and the average heat storage rate is 64.23%higher than that of the straight fin structure.Reasonable arrangement of fin structures can shorten the total melting time of phase change materials and enhance the phase change energy storage characteristics of a triplex-tube latent heat energy storage system.

关 键 词：潜热储能系统 相变材料 储能特性 肋片结构 数值模拟 

分 类 号：TK02[动力工程及工程热物理]