储能科学与技术 ›› 2022, Vol. 11 ›› Issue (11): 3681-3687.doi: 10.19799/j.cnki.2095-4239.2022.0320

• 储能测试与评价 • 上一篇    下一篇

偏心分形翅片管相变储热单元性能强化模拟

刘立君1,2(), 宁雅倩1, 李晓庆2(), 刘晓燕1   

  1. 1.东北石油大学,黑龙江 大庆 163318
    2.常熟理工学院,江苏 苏州 215500
  • 收稿日期:2022-06-13 修回日期:2022-06-23 出版日期:2022-11-05 发布日期:2022-11-09
  • 通讯作者: 李晓庆 E-mail:13836738423@126.com;li964499@126.com
  • 作者简介:刘立君(1974—),男,博士,教授,研究方向为建筑节能,E-mail:13836738423@126.com
  • 基金资助:
    国家自然科学基金项目(52076036)

Performance enhancement simulation of eccentric fractal-fin tube phase change heat storage unit

Lijun LIU1,2(), Yaqian NING1, Xiaoqing LI2(), Xiaoyan LIU1   

  1. 1.Northeast Petroleum University, Daqing 163318, Heilongjiang, China
    2.Changshu Institute of Technology, Suzhou 215500, Jiangsu, China
  • Received:2022-06-13 Revised:2022-06-23 Online:2022-11-05 Published:2022-11-09
  • Contact: Xiaoqing LI E-mail:13836738423@126.com;li964499@126.com

摘要:

为了探索偏心分形翅片管对相变储热单元性能强化的作用机理,对偏心分形翅片管相变储热单元中石蜡的熔化展开了二维非稳态模拟研究。在考虑自然对流的情况下对比研究了偏心矩形翅片和偏心分形翅片两种储热单元的传热特性。并对偏心分形翅片结构进行了局部强化,选择矩形翅片、Y型翅片和分型翅片3种方案。结果表明,偏心分形翅片结构对自然对流的促进高于偏心矩形翅片结构且整体温度分布更均匀,这与分型翅片可以促进热量由点到面的扩散相符。在3种局部强化方案中,偏心分形翅片强化效果最佳,且整个过程的熔化速率都有提高,使熔化时间缩短了70%。这对管壳式相变蓄热器的性能提升提供了很好的理论指导,进一步扩展了其在储能领域的应用前景。

关键词: 相变传热, 储热单元, 分型翅片, 局部强化

Abstract:

To explore the mechanism of eccentric fractional-finned tubes improving the performance of phase change heat storage unit (PCCS), a two-dimensional unsteady simulation was conducted to study the melting of paraffin wax in the PCCS. The heat transfer characteristics of eccentric rectangular fin and eccentric fractal fin are compared considering natural convection. Demonstrating that the eccentric fractal fin enhances natural convection more than the eccentric rectangular fin and the temperature distribution is more uniform, which is consistent with the fact that the fractal fin can enhance heat diffusion from point to the surface, the partial strengthening of the eccentric fractal fin structure was conducted, and three schemes of rectangular fin, Y fin, and split fin were chosen. In the three local strengthening schemes, the eccentric fractal fin has the best strengthening impact, the melting rate is increased in the entire process, and the melting time is shortened by 70%. This offers good theoretical guidance for the performance enhancement of shell and tube phase change heat accumulators and further increases its application prospects in the field of energy storage.

Key words: phase change heat transfer, thermal storage unit, fractal fin, local reinforcement

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