储能科学与技术2024，Vol.13Issue(2)：405-415,11.DOI:10.19799/j.cnki.2095-4239.2023.0627
双翅片矩形相变储能单元蓄热性能实验研究
Experimental study on heat storage performance of a double-fin rectangular phase change energy storage unit
摘要
Abstract
This study aims to investigate the influence of different boundary temperatures on the heat storage performance of the phase change energy storage unit(PCESU)by conducting visual experiments on the melting process of phase change material(PCM)in a double-fin rectangular PCESU at different boundary temperatures.The analysis involves examining the melting behavior and heat transfer process based on the observation of the solid-liquid interface,PCM temperature,and liquid fraction.The results show that during the late melting stage,solid PCM accumulated at the right-bottom of the PCESU,extending the heat storage time,with the melting time ratio of the PCM at this stage exceeding 30％.With the increase of boundary temperature,the shape of the solid-liquid interface remains considerably constant,with temperature distribution variation being similar.However,the evolution process of the solid-liquid interface accelerates,and natural convection is enhanced,leading to a 60％increase in the nonuniformity of the temperature distribution in the PCM.Moreover,the phase transition temperature increases by a maximum of 2.9℃.The results demonstrate that when the boundary temperature increases from 50℃ to 73℃,the complete melting time is shortened by 510 min.Lower the boundary temperature,greater the FoSte,indicating that increasing the boundary temperature has a pronounced effect on heat transfer enhancement of the PCM at a lower boundary temperature.关键词
双翅片/矩形相变储能单元/边界温度/熔化过程/自然对流Key words
double-fin/rectangular phase change energy storage unit/boundary temperature/melting process/natural convection分类
能源科技引用本文复制引用
罗意彬,段文超,严景好,李杰,孙小琴,廖曙光..双翅片矩形相变储能单元蓄热性能实验研究[J].储能科学与技术,2024,13(2):405-415,11.基金项目
国家级纳米复合型固液相变材料热调控机理及传热特性研究(52078053),湖南省湖水源空调系统关键技术研究及其在低碳建筑中的应用示范(2022sfq27),湖南省科技创新领军人才(2023RC1057). （52078053）
