偏心分形翅片管相变储热单元性能强化模拟

doi:10.19799/j.cnki.2095-4239.2022.0320

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

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.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.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/Abstract

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

中图分类号:

TK 02

刘立君, 宁雅倩, 李晓庆, 刘晓燕. 偏心分形翅片管相变储热单元性能强化模拟[J]. 储能科学与技术, 2022, 11(11): 3681-3687.

Lijun LIU, Yaqian NING, Xiaoqing LI, Xiaoyan LIU. Performance enhancement simulation of eccentric fractal-fin tube phase change heat storage unit[J]. Energy Storage Science and Technology, 2022, 11(11): 3681-3687.

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特性	石蜡	铝
固相温度/K	324.15	2719
液相温度/K	330.15	—
固相密度/(kg/m³)	940	—
液相密度/(kg/m³)	760	—
比热容/[J/(kg·K)]	2100	871
相变潜热/(J/kg)	170000	—
热导率/[W/(m·K)]	0.25	202.4
热膨胀系数/K^-1	0.001	—
动力黏度/[kg/(m·s)]	0.00324	—

特性	n-eicosane
固相温度/K	308.15
液相温度/K	310.15
液相密度/(kg/m³)	770
比热容/[J/(kg·K)]	2460
相变潜热/(J/kg)	247600
热导率/[W/(m·K)]	0.1505
热膨胀系数/K^-1	0.0009
动力黏度/[kg/(m·s)]	0.00385

结构	熔化总时间/s
偏心矩形翅片结构	4000
偏心分形翅片结构	4400
偏心分形翅片强化结构	2600
偏心矩形翅片强化结构	3200
偏心Y形翅片强化结构	3190

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偏心分形翅片管相变储热单元性能强化模拟

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

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