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Comparison of salt solution and air drying methods for moisture fixation in highly porous building materials

机译：高孔建筑材料中盐溶液与空气干燥方法的比较

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In recent years, research has identified some bio-based, porous building materials as good or excellent regulators of moisture in buildings. The ability of a material to absorb, release and store moisture is described by vapour sorption isotherms. It is necessary input to simulations of indoor environmental parameters in regards to human comfort, and nowadays it can be determined by a number of laboratory experiments, each of which characterized by specific specimen size, equilibration time and methodology. The purpose of this study is to experimentally derive isotherms for three bio-based, porous building materials by a standardized testing method, using saturated salt solutions. Furthermore, results from the standard method are compared to values of moisture content for the same materials, obtained by air-drying at different relative humidity. This is done with the aim to compare the findings from the two methods with respect to time and repeatability of the results. Derived isotherms are further used as direct input in the building simulation software BSim, which is capable of predicting indoor environment parameters by solving coupled, transient heat and moisture transport equations using finite volume method discretization. Indoor air relative humidity and moisture content distribution in the construction are compared for the experimented materials and conventional building materials. Results show better agreement between isotherms obtained by standard method and air-drying for low density materials. Simulation results suggest that bio-based, highly porous building materials are comparable to conventional building materials in respect to air relative humidity variations, compared to conventional building materials.
机译：近年来，研究已经确定了一些基于生物的多孔建筑材料，以及建筑物中水分的好的或优秀调节器。通过蒸气吸附等温物描述了材料吸收，释放和储存水分的能力。对于人类舒适性，对室内环境参数模拟的必要输入，现在可以通过许多实验室实验确定，每个实验室都是特征的特定样本尺寸，平衡时间和方法。本研究的目的是通过使用饱和盐溶液，通过标准化的测试方法通过标准化的试验方法进行实验导出三个生物的多孔建筑材料。此外，通过在不同相对湿度下通过空气干燥而获得的标准方法的结果与相同材料的水分含量的值进行比较。这是为了比较两种方法关于结果的时间和重复性的发现。衍生的等温物在建筑模拟软件BSIM中进一步用作直接输入，其能够通过使用有限体积方法离散化来通过求解耦合，瞬态的热量和水分传输方程来预测室内环境参数。将室内空气相对湿度和水分含量分布在结构和常规建筑材料中进行比较。结果表明，通过标准方法和低密度材料的空气干燥获得了等温线之间的更好协议。仿真结果表明，与传统建筑材料相比，生物基，高度多孔建筑材料与传统的建筑材料相比，与空气相对湿度变化相比。

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