Abstract Controlling and understanding indoor humidity and pollutants can help reduce the risk of health concerns. The experimental results suggested that there is a similarity relationship between water vapor and Volatile Organic Compounds (VOC) in diffusion through porous media. In this paper, the similarity between the moisture and pollutant transport and storage coefficients of porous building materials has been clearly established and explained. In addition, two similarity coefficients have been defined for VOC storage and diffusion to estimate the VOC properties from the moisture properties of the same material. A coupled hygric-pollutant (VOC) model which can be used to simulate VOC and hygric behavior of building materials under dynamic conditions is presented. The model which is implemented in the environment SPARK (Simulation Problem Analysis and Research Kernel) suited to complex problems using finite difference technique with an implicit scheme, has been validated with the experimental data. It is then applied to study the effect of toluene and moisture buffering capacities of a hemp concrete wall on indoor toluene concentration and relative humidity (RH). Hemp concrete was chosen in this study because it is an environmentally-friendly material that is used more and more in building construction. The toluene (TOL, selected VOC for this study) transport and storage properties obtained from hygrique properties of hemp concrete based on the assumption of the similarity between toluene and moisture transport have been modelled and investigated. At the room level, the results obtained show that taking into account the sorption capacity toward moisture and toluene has a significant effect on indoor RH and IAQ because hemp concrete contributes to dampen indoor RH and toluene variations. The numerical model presented is very useful for the building design optimization and can be used for a fast estimation of indoor pollution and hygrothermal conditions in building.

中文翻译：

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模拟大麻混凝土的甲苯和水分缓冲能力对室内空气质量和热舒适性的相似性和潜力

摘要 控制和了解室内湿度和污染物有助于降低健康问题的风险。实验结果表明，在通过多孔介质的扩散过程中，水蒸气和挥发性有机化合物（VOC）之间存在相似的关系。在本文中，已经明确地建立和解释了多孔建筑材料的水分和污染物输送和储存系数之间的相似性。此外，还为 VOC 存储和扩散定义了两个相似系数，以从相同材料的水分特性估计 VOC 特性。提出了一种耦合的湿-污染物 (VOC) 模型，该模型可用于模拟动态条件下建筑材料的 VOC 和吸湿行为。该模型在适用于复杂问题的 SPARK（模拟问题分析和研究内核）环境中使用隐式方案的有限差分技术实现，并已用实验数据进行了验证。然后将其应用于研究甲苯和大麻混凝土墙的水分缓冲能力对室内甲苯浓度和相对湿度 (RH) 的影响。在本研究中选择大麻混凝土是因为它是一种越来越多地用于建筑施工的环保材料。基于甲苯和水分传输之间相似性的假设，对从大麻混凝土的 hygrique 特性中获得的甲苯（TOL，本研究选择的 VOC）传输和储存特性进行了建模和研究。在房间层面，获得的结果表明，考虑到对水分和甲苯的吸附能力对室内 RH 和 IAQ 有显着影响，因为大麻混凝土有助于抑制室内 RH 和甲苯的变化。所提出的数值模型对于建筑设计优化非常有用，可用于快速估计建筑中的室内污染和湿热条件。