Journal of South China University of Technology (Natural Science Edition) ›› 2011, Vol. 39 ›› Issue (1): 42-47.doi: 10.3969/j.issn.1000-565X.2011.01.008

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

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)

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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