双螺旋管相变蓄热单元的实验研究及结构优化

燕燕; 刘泽澎; 曾丽萍; 贺颖; 李小华; 陈晓

doi:10.19912/j.0254-0096.tynxb.2024-1999

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太阳能学报 ›› 2026, Vol. 47 ›› Issue (3) : 525-534. DOI: 10.19912/j.0254-0096.tynxb.2024-1999

双螺旋管相变蓄热单元的实验研究及结构优化

燕燕, 刘泽澎, 曾丽萍, 贺颖, 李小华, 陈晓

作者信息 +

EXPERIMENTAL STUDY AND STRUCTURAL OPTIMIZATION OF DOUBLE SPIRAL TUBE PHASE CHANGE HEAT STORAGE UNIT

Yan Yan, Liu Zepeng, Zeng Liping, He Ying, Li Xiaohua, Chen Xiao

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摘要

该文研究了复合相变材料在双螺旋管蓄热装置中的蓄热能力和相变过程。通过实验探究不同运行工况（流量与入口温度）对蓄热装置在熔化阶段的影响;采用数值模拟的方法探究蓄热单元内部温度场的演化,对蓄热单元结构进行优化,解决蓄热单元出现的熔化缓慢区域的问题。结果表明：流量的变化对复合相变材料熔化和功率的影响不大;入口温度对相变材料的熔化较明显,温度从80 ℃增大到90 ℃,复合相变材料的熔化时间缩短30.23%;最大储存能量为5.26 MJ。实验与模拟显示存在熔化缓慢区域,分析不同盘管直径与压缩比对蓄热单元热性能的影响。结果表明：当盘管直径为88 mm,压缩比为21∶10∶21时,蓄热单元换热更均匀,完全熔化时间缩短71.3%,平均热流密度提升42.5%,熔化缓慢区域在22578 s完全熔化。

Abstract

Phase change heat storage technology can solve the problem of solar energy intermittency and instability, and is a very promising energy storage technology. However, the efficiency of the heat storage unit is related to the phase change material and the heat transfer structure. In this paper, the heat storage capacity and phase change process of composite phase change materials in a double helical tube heat storage device were studied. The effects of different operating conditions （flow rate and inlet temperature） on the heat storage device in the melting stage were investigated by experiments. The numerical simulation method is used to explore the evolution of the temperature field inside the heat storage unit, and the structure of the heat storage unit is optimized to solve the problem of slow melting area in the heat storage unit. The results show that the change of flow rate has little effect on the melting and power of composite phase change materials. The inlet temperature has a significant effect on the melting of phase change materials. When the temperature increases from 80 ℃ to 90 ℃, the melting time of the composite phase change material is shortened by 30.23%. The maximum storage energy is 5.26 MJ. Experiments and simulations show that there is a slow melting zone. The effects of different coil diameters and compression ratios on the thermal performance of the heat storage unit are analyzed. The results show that when the coil diameter is 88 mm and the compression ratio is 21∶10∶21, the heat transfer of the heat storage unit is more uniform, the complete melting time is shortened by 71.3%, the average heat flux density is increased by 42.5%, and the slow melting zone is completely melted in 22578 s.

导出引用

燕燕, 刘泽澎, 曾丽萍, 贺颖, 李小华, 陈晓. 双螺旋管相变蓄热单元的实验研究及结构优化[J]. 太阳能学报. 2026, 47(3): 525-534 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1999

Yan Yan, Liu Zepeng, Zeng Liping, He Ying, Li Xiaohua, Chen Xiao. EXPERIMENTAL STUDY AND STRUCTURAL OPTIMIZATION OF DOUBLE SPIRAL TUBE PHASE CHANGE HEAT STORAGE UNIT[J]. Acta Energiae Solaris Sinica. 2026, 47(3): 525-534 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1999

中图分类号： TK02

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