摘要
拓扑优化肋片能够有效强化相变储热单元的传热与储热性能。通过建立管壳式相变储热单元二维数学模型,对比研究了不同储、放热时间下的最优肋片,开发了适用于不同储、放热循环的多工况肋片,并采用计盒维数、单位长度表面积对肋片结构定量表征。结果表明:增加储热时间使肋片分支更简单且呈非均匀分布;放热时间超过600 s后,肋片向储热单元中部延长以增大表面积。3000 s储热-放热循环肋片相比于单工况肋片,传热面积增大80%,单位质量放热量提高37.6%;300 s放热-储热循环肋片的分支末端得到了延展,单位质量储热量提高7.7%。
Topological fins can significantly improve heat transfer in latent heat storage units.In this study,a two-dimensional topology optimization model for a shell-and-tube latent heat storage unit was developed and experimentally validated.The optimal fin for different operating conditions and charge-discharge cycles was investigated.Box-counting dimensions and fin surface areas per unit length were used to characterize the topological fins.The results showed that increasing the charging time simplified the fin structures,whereas discharging times of more than 600 s extended the fin tips.For the 3000 s charge-discharge cycle,the optimal fin increased the surface area per unit length by 80%and the discharge energy density by 37.6%compared to the fin for the 3000 s charging process.The topological fin for a 300 s discharge-charge cycle with an extended branch resulted in a 7.7%increase in heat storage density.
作者
谢昀
赵耀
Xie Yun;Zhao Yao(College of Smart Energy,Shanghai Jiao Tong University,Shanghai,200240,China;Shanghai Institute of Non-carbon-based Energy Conversion and Utilisation,Shanghai,200240,China)
出处
《制冷学报》
北大核心
2025年第3期24-31,共8页
Journal of Refrigeration
基金
国家自然科学基金(51906150)资助项目
能源高效清洁利用全国重点实验室开放基金(ZJUCEU2022022)
国家电投-上海交大未来能源计划联合基金(WLNY-MS-2022-010)资助。
关键词
相变储热
拓扑优化
肋片
自然对流
多工况优化
latent thermal energy storage
topology optimization
fin structure
natural convection
multi-condition optimization
