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