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Review on Heat Transfer Mechanisms and Characteristics in Encapsulated PCMs

机译：封装PCM的传热机理与特性研究

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摘要

Latent heat storage (LHS) is a particularly promising technique compared with the conventional sensible heat storage (SHS) as it provides a high-energy storage density with a small volume. However, there are difficulties in practical engineering applications of LHS due to the heat releasing/absorbing, which involves phase transition and moving boundary problems and the unacceptable low thermal conductivity of the phase-change material (PCM). Furthermore, the encapsulation would affect the heat transfer characteristics of PCM significantly, depending on the parameters of various encapsulations and boundary conditions. Hence, this review analyzes heat transfer mechanisms during the phase-change process and numerical analysis for heat transfer in macroencapsulated PCMs according to the shape of containment. The effective heat capacity method and the enthalpy method, two of the most widely used numerical approaches for phase-change problems, are presented in detail. Besides numerical models for different PCM containment such as spherical, rectangular, and cylindrical containment models, PCM-based heat-sink models are reviewed, including several heat transfer enchantment technologies: finned structure and porous matrix. Finally, the challenges in numerical modeling and designing an LHS unit are also summarized in this article.
机译：与传统的显热储能（SHS）相比，潜热储能（LHS）是一种特别有前途的技术，因为它提供了高能量密度和小体积的储能。然而，由于放热/吸收，在LHS的实际工程应用中存在困难，这涉及相变和移动边界问题以及相变材料（PCM）的不可接受的低导热率。此外，取决于各种封装的参数和边界条件，封装将显着影响PCM的传热特性。因此，这篇综述分析了相变过程中的传热机理，并根据容器的形状对宏观封装的PCM中的传热进行了数值分析。详细介绍了有效热容法和焓法，这是解决相变问题最广泛使用的两种数值方法。除了针对不同PCM容器的数值模型（例如球形，矩形和圆柱形容器模型）之外，还审查了基于PCM的散热器模型，包括几种传热附魔技术：翅片结构和多孔基质。最后，本文还总结了数值建模和LHS单元设计中的挑战。

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  • 来源
    《Heat Transfer Engineering》 |2015年第11期|880-901|共22页
  • 作者

    SHULI LIU; YONGCAI LI; YAQIN ZHANG;

  • 作者单位

    Department of Civil Engineering, Architecture and Buildings, Faculty of Engineering and Computing, Coventry University, Sir John Laing Building, Much Park Street, Coventry, CV1 2HF, United Kingdom;

    Department of Civil Engineering, Architecture and Buildings, Faculty of Engineering and Computing, Coventry University, Coventry, United Kingdom,Faculty of Urban Construction & Environment Engineering, Chongqing University, Chongqing, China;

    Department of Civil Engineering, Architecture and Buildings, Faculty of Engineering and Computing, Coventry University, Coventry, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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