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A model for the effective thermal conductivity of moist porous building materials based on fractal theory

机译：基于分形理论的湿多孔建筑材料有效导热系数模型

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摘要

An accurate estimation of building material thermal conductivity is crucial for the modeling of heat transfer processes and the calculation of building energy consumption. The effect of moisture content on the thermal conductivity of the material is usually neglected in most currently used calculation methods. These methods cannot represent the interior multi-phase heat transfer process. In this paper, the coexisting solid-liquid-gas thermal conductivity physical model was proposed. Taking into account the pore structure characteristics of building materials, a coexisting tri-phase thermal conductivity calculation model based on capillary structure was established using fractal theory. The quantitative influence relationship of the parameters, such as porosity, pore diameter distribution, moisture content and fractal structure, on the thermal conductivity of moist porous materials was analyzed. The results provide a theoretical basis for the thermal conductivity correction of moist building materials.
机译：准确估算建筑材料的导热系数对于传热过程的建模和建筑能耗的计算至关重要。在大多数当前使用的计算方法中，通常忽略水分含量对材料导热性的影响。这些方法不能代表内部多相传热过程。本文提出了固液气热传导共存的物理模型。考虑到建筑材料的孔隙结构特征，利用分形理论建立了基于毛细管结构的三相导热系数计算模型。分析了孔隙度，孔径分布，水分含量和分形结构等参数对湿多孔材料导热系数的定量影响关系。研究结果为湿建筑材料的导热系数校正提供了理论依据。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第10期|387-399|共13页
  • 作者

    Yingying Wang; Chao Ma; Yanfeng Liu; Dengjia Wang; Jiaping Liu;

  • 作者单位

    State Key Laboratory of Green Building in Western China, Xi'an University of Architecture and Technology,School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology;

    China Construction Science and Technology Group Co., LTD;

    State Key Laboratory of Green Building in Western China, Xi'an University of Architecture and Technology,School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology;

    State Key Laboratory of Green Building in Western China, Xi'an University of Architecture and Technology,School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology;

    State Key Laboratory of Green Building in Western China, Xi'an University of Architecture and Technology,School of Environment and Municipal Engineering, Xi'an University of Architecture and Technology;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Model; Thermal conductivity; Moist porous building materials; Fractal;

    机译：型号;导热系数;潮湿的多孔建筑材料;分形;

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