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中南大学学报(自然科学版)

Journal of Central South University

第52卷    第1期    总第317期    2021年1月

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文章编号:1672-7207(2021)01-0008-11
结构参数对管壳式相变储热单元熔化过程性能提升的影响
李赛维,陶希军,孙志强

(中南大学 能源科学与工程学院,湖南 长沙,410083)

摘 要: 针对常规管壳式相变储热单元中热源管道与相变材料之间传热性能差的问题,以竖直放置圆柱形单内管管壳式相变储热单元内部熔化过程中相界面形状为依据,对管壳式相变储热单元结构进行改进,采用数值模拟对基准管壳式相变储热单元和优化结构单元中相变材料带自然对流的熔化过程进行研究,讨论相界面、温度场和速度场的演化过程,比较不同结构单元中平均液相分数和平均速度随时间的变化趋势,分析表征储热单元传热性能的相变材料完全熔化时间。研究结果表明:优化的管壳式相变储热单元外壳形状可增强自然对流作用,提高储热单元的传热性能,加快相变材料的熔化速率;与基准结构中的相变材料熔化时间相比,其完全熔化时间缩短13.6%~38.9%。

 

关键词: 管壳式;相变储热;结构优化;相界面;数值模拟

Influence of structural parameters on improvement of melting performance in shell-and-tube latent heat storage unit
LI Saiwei, TAO Xijun, SUN Zhiqiang

School of Energy Science and Engineering, Central South University, Changsha 410083, China

Abstract:To solve the problem of the low heat transfer performance in the shell-and-tube latent heat storage unit between the heating pipe and the phase change material, optimized structures of the shell-and-tube unit''''s outer shell were proposed based on the observation of the melting interface''''s shape in a baseline unit. The baseline unit was a vertical cylindrical shell-and-tube latent heat storage unit with one inner tube. The numerical method was utilized to obtain computational results of melting and natural convection within the baseline shell-and-tube latent heat storage unit and the optimized units, and the melting interface evolution, temperature field evolution and the velocity field evolution, the change of the average liquid fraction and average velocity with time were compared. The complete melting time was considered to reflect the heat transfer performance of the latent heat storage units. The results show that the shell-and-tube latent heat storage units with optimized shell structures enhance the effect of natural convection. The heat transfer performance is enhanced, and the phase change material melts faster.Compared to the baseline structure, the time for complete melting of the phase change material is decreased by 13.6%-38.9%.

 

Key words: shell and tube; latent heat storage; structure optimization; interface; numerical simulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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