储能科学与技术 ›› 2021, Vol. 10 ›› Issue (5): 1745-1752.doi: 10.19799/j.cnki.2095-4239.2021.0192

• 物理储能十年专刊·储热 • 上一篇    下一篇

板式相变储能换热器的性能优化

刘丽辉(), 张航, 彭子安, 李杰, 孙小琴()   

  1. 长沙理工大学能源与动力工程学院,湖南 长沙 410004
  • 收稿日期:2021-05-06 修回日期:2021-05-07 出版日期:2021-09-05 发布日期:2021-09-08
  • 作者简介:刘丽辉(1996—),女,硕士研究生,主要研究方向为相变材料传热性能,E-mail:liulh0909@163.com|孙小琴,教授,主要研究方向为相变储能技术,E-mail:xiaoqinsun@csust.edu.cn
  • 基金资助:
    国家重点研发计划(2018YFE011200);国家自然科学基金(52078053);湖南省自然科学基金优秀青年基金(2019JJ30027);湖南省高新技术产业科技创新引领计划(2020GK4057);长沙市杰出创新青年培养计划(kq2009049);研究生科研创新项目(CX20200868)

Energy storage optimization of a plate-type phase change heat exchanger

Lihui LIU(), Hang ZHANG, Zian PENG, Jie LI, Xiaoqin SUN()   

  1. School of Energy and Power Engineering, Changsha University of Science & Technology, Changsha 410004, Hunan, China
  • Received:2021-05-06 Revised:2021-05-07 Online:2021-09-05 Published:2021-09-08

摘要:

本工作设计了一种板式相变储能换热器,研究几何参数对换热器储能性能的影响。控制换热器的体积与储能量不变,构建了5种不同结构的板式相变储能换热器模型,利用FLUENT软件分别对其进行储能数值模拟,并对最佳结构的入口温度、入口流速进行优化计算。结果表明:减小板式相变单元厚度可以增加换热速率,但同时会增加压降,计算得到相变单元数量N=5时换热效率最佳;板式相变换热器的储能速率与边界流体流速成正比,与压降成反比;板式相变换热器的换热速率随入口温度升高而增加,但增加的幅度随着边界流速或温度的增加而减小。综合考虑换热器内部结构与工况对换热性能的影响,本研究中换热器性能最佳的为相变单元数量为5、热流速率为0.5 m/s的换热器模型,同时发现在实际应用中当流速较小时,需要重点关注换热器内部结构的设计。

关键词: 板式相变储能换热器, 数值模拟, 储能速率, 压降

Abstract:

In this paper, a prototype of a plate-type phase-change heat exchanger (PPCHE) is designed, and the influence of geometric parameters on the performance of the PPCHE is studied. Five PPCHEs models with different plate-type phase-change units (PPCUs) were constructed to control the heat exchanger volume and the PCM mass. Numerical simulation optimized the heat-transfer fluid (HTF) inlet temperature and velocity. The results showed that increasing the number of PPCUs increased the heat-transfer rate, but the pressure drop also increased. When the PPCUs numbered five in total, the heat-transfer efficiency was the best. The energy storage efficiency was proportional to the fluid velocity and inversely proportional to the pressure drop. The heat-transfer rate increased with an increasing HTF temperature; however, the increased rate decreased with an increase in HTF velocity or temperature. In this study, the best condition for the highest energy storage performance was v=0.5 m/s and N=5. In practical application, the design of the internal structure of the heat exchanger when the flow rate is low should be a primary focus.

Key words: plate phase change heat exchanger, numerical simulation, energy storage rate, pressure drop

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