储能科学与技术 ›› 2020, Vol. 9 ›› Issue (6): 1747-1754.doi: 10.19799/j.cnki.2095-4239.2020.0155

• 储能材料与器件 • 上一篇    下一篇

基于微通道平板换热器的相变材料放热性能影响研究

叶闻杰1,2(), 杨肖1,2, 孙富华1, 杨冬梅1, 杜炜1, 杨波1, 刘杨1, 王启扬1   

  1. 1.南瑞集团(国网电力科学研究院)有限公司,江苏 南京 211100
    2.国电南瑞科技股份有限 公司,江苏 南京 211100
  • 收稿日期:2020-04-23 修回日期:2020-05-02 出版日期:2020-11-05 发布日期:2020-10-28
  • 作者简介:联系人:叶闻杰(1994—),男,硕士,研究方向为热利用领域的工程热物理问题。E-mail:865958860@qq.com
  • 基金资助:
    国家重点研发计划项目(2018YFB0905000);国家电网公司科技项目(SGTYHT/16-JS-198)

Heat release property of phase change materials based on a microchannel heat exchanger

Wen'jie YE1,2(), Xiao YANG1,2, Fuhua SUN1, Dongmei YANG1, Wei DU1, Bo YANG1, Yang LIU1, Qiyang WANG1   

  1. 1.NARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 211100, Jiangsu, China
    NRAI Technology Co. , LTD. , Nanjing 211100, Jiangsu, China
  • Received:2020-04-23 Revised:2020-05-02 Online:2020-11-05 Published:2020-10-28

摘要:

掌握相变材料蓄、放热过程的影响因素对提高相变蓄、放热效率具有重要的指导意义。本文建立了平板换热器相变换热单元模型,基于Fluent软件的凝固/融化模型,以南瑞集团自主研发的乙酸钠基复合相变材料对其凝固放热过程进行仿真,分析了不同换热结构、流体流速以及相变材料厚度对相变材料换热过程的影响,并对平板换热器相变换热单元结构优化,创新性的设计了微通道平板换热器相变换热单元。结果表明:换热器的结构对换热性能有着重要的影响,相比于普通的平板式换热器,微通道换热器能明显地降低相变材料放热时间;流体流速增大放热速度有所提高,但是容易导致速度场温度场不均匀,换热性能提升有限。相变材料凝固总时间随相变材料厚度的增加而增加,对于相变蓄热产品,需按照设计时间对相变单元相变材料厚度进行选型。最后以仿真结果制备相变样机、搭建储/放热系统,并对比实验数据验证模拟结果。

关键词: 乙酸钠基复合相变材料, 微通道换热器, 相变换热

Abstract:

The factors affecting the process of phase change material (PCM) storage and heat release must be understood to improve the PCM storage and heat release efficiency. This study presents a plate heat exchanger heat unit model based on the solidification/melting model of FLUENT software, south of Switzerland group independent research and development of sodium acetate composite PCM on the exothermic process of solidification simulation, analyzed the different heat transfer structure, fluid velocity, and thickness of PCM for heat transfer process, the influence of PCM and heat unit on a flat plate heat exchanger structure optimization, the innovative design of microchannel plate heat exchanger heat units. The results show that the heat exchanger structure has an important effect on the heat transfer performance. The heat transfer velocity is improved with the fluid flow rate increase; however, the velocity and temperature fields are not uniform, and the heat transfer performance is limited. The total solidification time of the PCM increases with its thickness. The simulation results are used to prepare a phase change prototype, build a storage/heat release system, and verify the simulation results by experimental data comparison.

Key words: phase change material base on trihydrate sodium acetate, microchannel heat exchanger phase change heat exchanger

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