化工学报2023，Vol.74Issue(10)：4109-4128,20.DOI:10.11949/0438-1157.20230888
纳米相变微胶囊在蓄热结构化填充床中的应用模拟
Simulation of the application of nano-scale phase change microcapsules for thermal storage in structured packed bed
摘要
Abstract
Latent heat thermal energy storage using phase change materials is an effective approach to address the intermittency issues of renewable energy sources.Nano-scale phase change microcapsules were prepared by interfacial hydrolysis condensation method using tetrabutyl titanate(TBT)as the precursor.The average thermal conductivity is enhanced to 215%,reaching approximately 0.43 W/(m·K).The phase change temperature is found to be 42.4℃.The latent heat of nano-encapsulated phase change materials is about 234.7 J/g.The nano-scale phase change microcapsules improved heat transfer performance and are suitable for heat storage of solar thermal water heating systems.A three-dimensional computational model was established,and numerical simulations were conducted on the packed bed using Fluent software to study the heat storage/release performance of the sequential structure(SS)and cross compound structure(CS)packed bed.The analysis focused on examining the variations in liquid fraction,temperature distribution,and thermal storage/release power for both SS and CS under different flow rate.The results show that the melting/solidification rates increase with increasing flow rate.At the same flow rate,CS exhibited faster melting/solidification compared to SS.The temperature variation of CS was more uniform than that of SS at different stages.At lower flow rate(2 L/min),both SS and CS exhibit longer and more stable periods of thermal storage/release.Under different flow rate(2,4,and 6 L/min),the peak thermal storage power of CS is 1.7-1.9 times that of SS,and peak thermal release power is 1.8-2.0 times that of SS.关键词
相变/纳米相变微胶囊/填充床/数值模拟/顺排结构/叉排结构/蓄/放热性能Key words
phase change/nano-scale phase change microcapsule/packed bed/numerical simulation/sequential structure/cross compound structure/thermal storage/release performance分类
能源与动力引用本文复制引用
黄志国,孙志高..纳米相变微胶囊在蓄热结构化填充床中的应用模拟[J].化工学报,2023,74(10):4109-4128,20.基金项目
江苏省高校自然科学研究重大项目(16KJA480001) （16KJA480001）
江苏省自然科学基金项目(BK20170382) （BK20170382）
苏州市科技计划项目(SS202149) （SS202149）
