华南理工大学学报(自然科学版) ›› 2011, Vol. 39 ›› Issue (1): 42-47.doi: 10.3969/j.issn.1000-565X.2011.01.008

• 化学化工 • 上一篇    下一篇

高温熔融盐壳管式相变换热器的传热特性

左远志1 杨晓西1 丁静2   

  1. 1.华南理工大学传热强化与过程节能教育部重点实验室,广东广州510640;2.中山大学工学院,广东广州510006
  • 收稿日期:2010-05-17 修回日期:2010-08-09 出版日期:2011-01-25 发布日期:2010-12-01
  • 通信作者: 左远志(1968一),男,在职博士生,东莞理工学院副教授,主要从事高温蓄热研究 E-mail:zuoyz@dgut.edu.cn;zuoyuanzhi@sina.com
  • 作者简介:左远志(1968一),男,在职博士生,东莞理工学院副教授,主要从事高温蓄热研究
  • 基金资助:

    国家自然科学基金重点资助项目(50930007);国家“863”计划项目(2009AA05Z417);东莞市科技计划项目(2o07108101O16)

Heat Transfer Analysis on High-temperature Heat Exchanger of Shell & Tubes with Molten-salt Phase Change Materials

Zuo Yuan-zhi1 Yang Xiao-xi1 Ding Jing2   

  1. 1. South China university of technology of the heat transfer process of reinforcement and the energy saving the key laboratory, guangdong guangzhou 510640;2. Institute of sun yat-sen university, guangdong guangzhou 510006
  • Received:2010-05-17 Revised:2010-08-09 Online:2011-01-25 Published:2010-12-01
  • Contact: 左远志(1968一),男,在职博士生,东莞理工学院副教授,主要从事高温蓄热研究 E-mail:zuoyz@dgut.edu.cn;zuoyuanzhi@sina.com
  • About author:左远志(1968一),男,在职博士生,东莞理工学院副教授,主要从事高温蓄热研究
  • Supported by:

    国家自然科学基金重点资助项目(50930007);国家“863”计划项目(2009AA05Z417);东莞市科技计划项目(2o07108101O16)

摘要: 建立了高温熔融盐壳管式相变换热器的同心套管模型.采用Fluent软件,分析了在考虑相变区域自然对流条件下,熔融盐流体与相变材料的物性参数、内管进口温度与进口流向等因素对液相率与熔化时间的影响,并在熔融盐传热-蓄热实验平台上进行了试验研究.发现:考虑相变区域自然对流时,总的熔化时间减少16.2%;模拟得到的壳侧相变材料温度随时间的变化趋势与实验结果趋于一致.结果表明,可采用熔融盐相变区域特殊测点温度超过相变材料的熔点,并升至与内管流体进口温度相近时所耗费的时间作为壳管式相变换热器内相变材料完全熔化的判据.

关键词: 熔融盐材料, 相变材料, 壳管式换热器, 强化传热

Abstract:

In this paper,first,a concentric circular tube model for the shell-tube heat exchanger with molten-salt phase change materials(PCMs) is established.Then,the liquid fraction and the total melting time,which are affected by the thermal-physical parameters of the molten salt fluid and the PCMs as well as by the inlet velocity and the flow direction of the inner tube,are analyzed with Fluent,by taking into consideration the natural convection in the PCMs region.Finally,some experiments are carried out on a test platform of molten-salt heat transfer.The results show that the total melting time nearly decreases by 16.2% considering the natural convection in the PCMs region,and that the simulated temperature of PCMs at the shell side varies with time,which has a tendency similar to that of the experimental results.Thus,it comes to the conclusion that,when the temperature of the specific measu-ring point in the PCMs region exceeds the melting point of PCMs and rises to the tube inlet temperature,the corresponding time cost can be used as the criterion of melting ending of PCMs.

Key words: molten salt materials, phase change materials, heat exchanger of shell &, tubes, enhancement of heat transfer