雪花型翅片提高相变储热单元储/放热性能

doi:10.19799/j.cnki.2095-4239.2021.0541

储能科学与技术 ›› 2022, Vol. 11 ›› Issue (2): 521-530.doi: 10.19799/j.cnki.2095-4239.2021.0541

雪花型翅片提高相变储热单元储/放热性能

张永学^1,^2,³(), 王梓熙^1,³, 鲁博辉^1,³, 杨胜旗^1,³, 赵泓宇^1,³

^1.中国石油大学（北京）机械与储运工程学院，北京 102249
^2.海南医学院国际教育学院，海南海口 571199
^3.北京市过程流体过滤与分离重点实验室，北京 102249

收稿日期:2021-08-23 修回日期:2021-11-08 出版日期:2022-02-05 发布日期:2022-02-08
通讯作者: 张永学 E-mail:zhyx@cup.edu.cn

Enhancement of charging and discharging performance of a latent-heat thermal-energy storage unit using snowflake-shaped fins

Yongxue ZHANG^1,^2,³(), Zixi WANG^1,³, Bohui LU^1,³, Shengqi YANG^1,³, Hongyu ZHAO^1,³

^1.College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing 102249, China
^2.School of International Education, Hainan Medical University, Haikou 571199, Hainan, China
^3.Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing 102249, China

Received:2021-08-23 Revised:2021-11-08 Online:2022-02-05 Published:2022-02-08
Contact: Yongxue ZHANG E-mail:zhyx@cup.edu.cn

摘要/Abstract

摘要：

相变储热技术能够很好地解决可再生能源在利用过程中的波动性和不稳定问题。然而，现有可供选择的相变材料均存在热导率低这一致命缺陷，导致储/放热速率十分缓慢，严重制约了其实际工业应用。为此，本文基于雪花晶体的分形结构，提出了一种新型翅片结构来提高填充了相变材料的潜热储存单元储/放速率。针对该单元储/放热过程进行了全三维多场耦合数值模拟研究，结果表明，在同一换热流体流动条件下，与具有相同体积的纵向翅片相比，雪花型翅片能够显著提高潜热储存单元的传热速率和温度均匀性，完全熔化/凝固时间可分别缩短26.87%和32.01%；尽管储热单元的储/放热速率均得到了大幅度提升，但是液态相变材料最大速度的积分平均值在储热过程中降低了26.83%，而在放热过程中提高了18.00%。

关键词: 雪花型翅片, 潜热储存单元, 相变材料, 储/放热性能, 自然对流

Abstract:

Phase-change heat storage technology can solve the volatility and instability of renewable energy during usage. However, available phase-change materials are challenged by their low thermal conductivity, which results in very slow heat storage/release rates, limiting industrial applications. Based on the fractal structure of snowflake crystals, herein, we propose a new type of fin structure to increase the storage/discharge rates of latent-heat storage units filled with phase-change materials. We performed a full three-dimensional multifield coupled numerical simulation on the heat storage/release process of the units. The results show that compared with longitudinal fins with the same volume, both the heat transfer rate and temperature uniformity are significantly enhanced by snowflake-shaped fins when the heat transfer fluids are under the same flow conditions. Further, for the longitudinal and snowflake-shaped fins, the complete melting/solidification time was reduced by 26.87% and 32.01%, respectively. Although the heat storage/release rate of the heat storage unit is greatly improved, the integral average value of the maximum velocity of the liquid phase change material is decreased by 26.83% during the charging process and increased by 18.00% during the discharging process.

Key words: snowflake fin, latent-heat storage unit, phase-change material, heat storage/release performance, natural convection

中图分类号:

TK 02

张永学, 王梓熙, 鲁博辉, 杨胜旗, 赵泓宇. 雪花型翅片提高相变储热单元储/放热性能[J]. 储能科学与技术, 2022, 11(2): 521-530.

Yongxue ZHANG, Zixi WANG, Bohui LU, Shengqi YANG, Hongyu ZHAO. Enhancement of charging and discharging performance of a latent-heat thermal-energy storage unit using snowflake-shaped fins[J]. Energy Storage Science and Technology, 2022, 11(2): 521-530.

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属性	石蜡	水	铜
密度/(g/cm³)	880(s)/760(l)	998.2	8960
比热容/[J·(g·K)]	1.8(s)/2.4(l)	4182	402.5
热导率/[W·(m·K)]	0.2(s)/0.1(l)	0.6	389
熔点/℃	28~40	—	—
相变潜热/(J/g)	157	—	—
密度/(g/cm³)	0.86(s)/0.79(l)	—	—
体膨胀系数/K^-1	0.0006	—	—
运动黏度/(m²/s)	3.3×10^-6	^—	^—

项目	储热过程	放热过程
进口温度/℃	52	22
进口速度/(m/s)	0.01	0.01
出口条件	压力出口	压力出口
其他面	绝热	绝热
初始温度/℃	22	52

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雪花型翅片提高相变储热单元储/放热性能

Enhancement of charging and discharging performance of a latent-heat thermal-energy storage unit using snowflake-shaped fins

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