气泡扰动作用下相变储热器内木糖醇的熔化凝固特性  

Melting and Solidification Characteristics of Xylitol in Phase Change Heat Storage under the Action of Bubble Disturbance

作　　者：王彬睿 陈徐烨钶 邵雪峰 袁艳平[1] Wang Binrui;Chenxu Yeke;Shao Xuefeng;Yuan Yanping(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu,610031)

机构地区：[1]西南交通大学机械工程学院,成都610031

出　　处：《制冷与空调（四川）》2024年第4期451-458,471,共9页Refrigeration and Air Conditioning

摘　　要：木糖醇相变材料因其特有的强过冷特性而有望用于长周期储热,为了研究气泡扰动对储热系统内部熔化凝固特性的影响,设计搭建了一个相变储热器,填充4kg木糖醇,用143℃导热油从室温开始加热熔化,进行了通气和不通气两个工况;完全融化后以3℃导热油开始冷却凝固过程,进行了通气、不通气和自然冷却三个工况。在加热融化过程中,通气工况下加热管道上侧近端和远端的平均温度上升明显,分别增加了7.1℃和9.4℃,且加热管道左右两侧和下侧的平均温度高于上侧约5℃。在冷却凝固过程中,储热器中间截面的平均温度高于两侧截面5℃左右,且远离中心管道空间位置的温度更高,并且气泡扰动能使得热量利用提前,耗时缩短3/4,同时将木糖醇材料的结晶温度提升了大约20℃。上述研究为相变储热器的结构优化设计提供了实验基础和参考依据。Xylitol phase change materials(PCMs)are promising for long-term thermal energy storage due to their unique strong undercooling characteristics.To investigate the influence of bubble disturbance on the melting and solidification characteristics within thermal storage systems,a phase change thermal energy storage unit was designed and constructed in this study.The unit was filled with 4 kg of xylitol and heated from room temperature using 143℃thermal oil to initiate melting under two conditions:with and without ventilation.After complete melting,the system was cooled using 3℃thermal oil to initiate solidification under three conditions:with ventilation,without ventilation,and natural cooling.During the heating and melting process,the average temperatures at the proximal and distal ends of the heating pipeline increased significantly under ventilation conditions,rising by 7.1℃and 9.4℃respectively.Additionally,temperatures on the left,right,and lower sides of the heating pipeline were approximately 5℃higher than those on the upper side.During the cooling and solidification process,the average temperature of the central cross-section of the thermal storage unit was about 5℃higher than that of the side cross-sections,with temperatures further away from the central pipeline being higher.Bubble disturbance facilitated heat utilization advancement,reducing processing time by three-quarters and increasing the crystallization temperature of xylitol by approximately 20℃.This research provides an experimental foundation and reference for the structural optimization of phase change thermal energy storage systems.

关 键 词：相变储热 气泡扰动 熔化 凝固 木糖醇 

分 类 号：TK02[动力工程及工程热物理]