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Effect of moisture migration and phase change on effective thermal conductivity of porous building materials

机译：水分迁移和相变对多孔建筑材料有效导热系数的影响

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摘要

In this paper, a new method for precise evaluation of the effective thermal conductivity (ETC) caused by moisture transfer inside porous building materials was proposed. Moreover, the mathematical models for coupled heat and moisture transfer without and with moisture phase change were established. Based on the interactions among the moisture phase change, temperature field, and moisture field inside the porous materials, a loop iteration calculation method was proposed to solve for the heat flux caused by moisture migration and phase change. By combining the heat flux with the classical evaporation and condensation theory, the additional thermal conductivities (ATCs) caused by the moisture migration and phase change were obtained. In order to obtain the quantitative relationships between the main factors and ATC caused by moisture transfer, different temperature and humidity boundary conditions were used to analyze the ATC. The results show that the ATC caused by moisture migration increases when the temperature difference decreases and the water vapor pressure difference between the indoor and outdoor air increases. The ATC is greatly influenced by outdoor air temperature fluctuations, while the influence of water vapor pressure fluctuations is relatively small. The value for the ATC caused by moisture phase change is mainly determined by the temperature gradient.
机译：本文提出了一种精确评估多孔建筑材料内部水分传递引起的有效导热系数（ETC）的新方法。此外，建立了无水相变化和有水相变化的热与湿耦合耦合的数学模型。基于多孔材料内部水分相变，温度场和水分场之间的相互作用，提出了一种循环迭代计算方法来解决水分迁移和相变引起的热通量。通过将热通量与经典的蒸发和冷凝理论相结合，获得了由水分迁移和相变引起的附加热导率（ATC）。为了获得水分传递引起的主要因素与ATC之间的定量关系，采用不同的温度和湿度边界条件对ATC进行分析。结果表明，当温差减小而室内外空气之间的水蒸气压差增大时，由水分迁移引起的ATC增加。 ATC受室外空气温度波动的影响很大，而水蒸气压力波动的影响相对较小。由水分相变引起的ATC值主要由温度梯度决定。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2018年第10期|330-342|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

    Additional thermal conductivity; Porous building materials; Coupled heat and moisture transfer; Moisture migration; Moisture phase change;

    机译：附加的热导率;多孔建筑材料;热与水分的耦合传递;水分迁移;水分相变;

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