仿生葫芦储热单元潜热蓄热堆积床数值研究  

Numerical study on thermal performance of packed-bed latent heat thermal energy storage system with bionic-calabash-shaped capsule

作　　者：张国良 罗康[1] 王富强[1] 东岩 陈旭东 帅永[1] ZHANG Guoliang;LUO Kang;WANG Fuqiang;DONG Yan;CHEN Xudong;SHUAI Yong(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2024年第6期124-132,共9页Journal of Harbin Institute of Technology

基　　金：国家重点研发计划(2018YFA0702300);国家自然科学基金面上项目(52076064)。

摘　　要：在碳达峰与碳中和的“双碳”能源背景下,传统封装相变材料(PCM)的储热单元与潜热储热堆积床(LHTES)系统无法满足当前的储热需求,而仿生学在储热领域的应用,可以为二者储热效率的提升提供一种全新的思路。为此,提出一种仿生葫芦结构的新型储热单元以增加传热面积,提高LHTES系统的热性能。优化仿生葫芦单元结构的尺寸参数对单元熔融特性的影响,确定最优熔融特性的尺寸参数。分析传统球形和仿生葫芦LHTES的温度分布、液相率、蓄热能力等性能指标的影响。结果表明,葫芦结构可提升14.5%的单元换热面积,与传统模型相比,仿生模型液相率和储热完成率最大可分别提升12.67%和6.2%。在此基础上,分析入口温度和流速对系统性能的影响,结果表明,进口温度对系统的储热性能影响较大,进口温度增大15 K,堆积床系统的储热时间比原来缩短59.6%。该研究可为优化LHTES系统、提高实际条件下的热性能提供参考。Following the background of"dual carbon"energy with peak carbon and carbon neutrality,conventional heat storage capsule with phase change materials(PCM)and latent heat thermal storage system(LHTES)with packed bed cannot meet the current heat storage demand.The application of bionics in the field of heat storage offers a new approach to improve the heat storage efficiency of the capsule and LHTES.This paper introduces a novel bionic-calabash-shaped capsule for thermal energy storage units to increase heat transfer surface area and improve the thermal performance of LHTES systems.Firstly,the influence of optimized dimensional parameters of the biomimetic gourd unit on its melting characteristics is analyzed to determine the optimal dimensions for achieving desirable melting characteristics.Secondly,the analysis of temperature distribution,liquid fraction,heat storage capacity,and other performance indicators is conducted for LHTES of conventional sphere and biomimetic calabash.The results reveal that the bionic-calabash capsule can increase the heat transfer area by 14.5%.Compared to the traditional model,the liquid phase fraction and heat storage completion rate of biomimetic model increase by 12.67%and 6.2%,respectively.On this basis,the influence of inlet temperature and flow rate on system performance is analyzed,and the results show that the inlet temperature significantly impacts the system′s thermal storage performance.A 15 K increase in the import temperature leads to a 59.6%reduction in the thermal storage time for the stacked bed system.This study provides valuable insights for optimizing stacked bed LHTES systems and enhancing their thermal performance under real-world conditions.

关 键 词：太阳能 相变材料 储热 堆积床系统 仿生学 

分 类 号：TK02[动力工程及工程热物理]