Many new insulation materials are being developed and thermally tested aiming at understanding and improving their insulation characteristics in order to improve the energy performance of new and existing buildings. Bio-sourced materials appear among the new insulation solutions presenting the advantage of being able to save energy on one hand and having a low environmental impact on the other. The wood fiber material is one of the most successful natural insulation materials being recently used in building constructions. It presents many advantages besides its insulation performance; due to its density, it stores moisture thereby improving the indoor air quality; it is also an excellent acoustic insulator because it has a natural tendency to absorb and reduce sounds. In order to evaluate its effectiveness in building applications, this study analyzes the hygrothermal modelling and performance of the wood fiber insulation in building applications by adopting two approaches: A numerical approach using a mathematical model that describes heat and mass transfer within the wood fiber material being considered as porous media. The hygrothermal characteristics of the wood fiber material are first determined experimentally for this purpose, namely the thermal conductivity, the heat capacity, and the isotherms of sorption and desorption. An experimental approach is carried out in controlled and uncontrolled ambiance conditions in order to validate the numerical model. A 50 cm × 50 cm wood fiber sample having an 8 cm thickness is tested for this purpose. A very high accordance is observed between the measured and modelled results for both the temperature and the relative humidity evolutions within the sample at x = 2 cm and x = 4 cm with a mean difference \( \overline{\Delta \mathrm{T}} \) of 0,21 °C at x = 4 cm and 1 °C at x = 2 cm. The maximum recorded differences for the relative humidity are: 5,5% and 4,5% at x = 2 cm and 4 cm respectively. The ability to predict the thermal and the hygric behavior of the wood fiber insulation will thus allow a better understanding of the efficiency of natural insulation materials.

为了改善和改善新建筑和现有建筑的能源性能，许多新的隔热材料正在开发和热测试中，旨在了解和改善其隔热特性。生物绝缘材料出现在新的隔热解决方案中，其优点是一方面可以节省能源，另一方面可以降低环境影响。木纤维材料是最近在建筑中使用的最成功的天然隔热材料之一。除了绝缘性能外，它还具有许多优点。由于它的密度，它可以储存水分，从而改善室内空气质量。它也是一种出色的隔音材料，因为它具有吸收和减少声音的自然趋势。为了评估其在构建应用程序中的有效性，这项研究通过采用两种方法分析了建筑应用中木质纤维保温材料的湿热模型和性能：一种使用数学模型的数值方法，该数学模型描述了被视为多孔介质的木质纤维材料内部的传热和传质。为此，首先通过实验确定木纤维材料的湿热特性，即热导率，热容量以及吸附和解吸等温线。为了验证数值模型，在受控和不受控制的环境条件下进行了实验方法。为此，测试了厚度为8 cm的50 cm×50 cm木纤维样品。\（\ overline {\ Delta \ mathrm {T}} \）在x = 4 cm时为0.21°C，在x = 2 cm时为1°C。相对湿度的最大记录差异为：x = 2 cm和4 cm时分别为5.5％和4.5％。因此，预测木纤维绝缘材料的热和湿气行为的能力将使人们更好地了解天然绝缘材料的效率。