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首页> 外文期刊>Building and Environment >Combined effects of sorption hysteresis and its temperature dependency on wood materials and building enclosures-part II: Hygrothermal modeling
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Combined effects of sorption hysteresis and its temperature dependency on wood materials and building enclosures-part II: Hygrothermal modeling

机译：吸附滞后及其对木材和建筑围护结构的温度依赖性的综合影响-第二部分：湿热模型

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Hygroscopic materials such as wood and wood based materials have been widely used as insulation and surface moisture buffering materials due to their low thermal conductivity and high moisture capacity. And their hygrothermal performance is mainly dependent on the moisture properties, such as sorption isotherm and water vapor permeability etc. Instead of a univalued function of relative humidity, sorption isotherm of wood materials is not only affected by sorption history, but also temperature dependent. This work is devoted to a better understanding of the effects of temperature dependent sorption hysteresis on moisture transport in wood and wood based materials under ambient temperature and relative humidity variations through experimental investigations and numerical modeling. In part I, the formulated hygrothermal model based on local thermodynamic equilibrium assumption and Frandsen's hysteresis model are experimentally validated. In this part, the effects of sorption hysteresis and its temperature dependency are investigated under several dynamic conditions through numerical modeling. Hysteresis should be taken into account in determining the moisture buffering capacity, and temperature dependency should be considered to investigate the RH variation in the material when it is subjected to drastic temperature fluctuation. Then heat and moisture transport through a roof assembly under natural climate conditions is further modelled to show the effects of temperature dependent sorption hysteresis in practical applications. (C) 2016 Elsevier Ltd. All rights reserved.
机译：诸如木材和木质材料的吸湿材料由于其低导热率和高湿容量而被广泛用作绝缘和表面湿气缓冲材料。它们的湿热性能主要取决于水分特性，例如吸附等温线和水蒸气渗透性等。木材材料的吸附等温线不仅受相对湿度的单值作用，不仅受吸附历史的影响，而且还取决于温度。这项工作致力于通过实验研究和数值模拟，更好地理解温度依赖性吸附滞后对木材和木质材料在环境温度和相对湿度变化下的水分传输的影响。在第一部分中，通过实验验证了基于局部热力学平衡假设的公式化湿热模型和Frandsen磁滞模型。在这一部分中，通过数值模型研究了几种动态条件下吸附滞后的影响及其温度依赖性。在确定水分缓冲能力时应考虑滞后性，并且应考虑温度依赖性，以研究材料在剧烈温度波动下的相对湿度变化。然后，对在自然气候条件下通过屋顶组件的热和湿气传输进行了进一步建模，以显示实际应用中温度相关的吸附滞后的影响。 （C）2016 Elsevier Ltd.保留所有权利。

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