The use of bio-sourced materials for thermal insulation of buildings is growing mainly for environmental reasons. It has already been demonstrated that since these materials are highly hydrophilic, mass transfer may have significant influence on their temperature field. We first develop a heat and mass transfer model with a limited number of parameters and we use it to simulate the mass and temperature fields during a typical transient experiment dedicated to vapor diffusion coefficient estimation. Estimations made from these simulations with a simple mass transfer model show that the estimation error can be greater than 30 % in some cases. A sensitivity study shows that the vapor diffusion coefficient, the thermal conductivity and the external mass transfer coefficient can be estimated separately from a mass recording, with the coupled model. An experimental study carried out at 15°C, 25°C and 35°C on a wood fiber board confirms the results of the theoretical study. The deviation between the vapor diffusion coefficient estimated with and without taking into account the heat transfer was 13.3 % at 35°C. It is finally shown that the isosteric heat of sorption has no effect on the estimation of the diffusion coefficient.

出于环境原因，生物源材料在建筑物隔热方面的使用正在增长。已经证明，由于这些材料具有高度亲水性，因此传质可能对其温度场产生重大影响。我们首先开发了一个具有有限数量参数的传热和传质模型，并在专门用于蒸汽扩散系数估计的典型瞬态实验中使用它来模拟质量和温度场。使用简单的传质模型对这些模拟进行的估计表明，在某些情况下，估计误差可能大于 30%。敏感性研究表明，蒸汽扩散系数、热导率和外部传质系数可以通过耦合模型与质量记录分开估计。在 15°C、25°C 和 35°C 下在木纤维板上进行的实验研究证实了理论研究的结果。在 35°C 下，在考虑和不考虑传热的情况下估计的蒸汽扩散系数之间的偏差为 13.3%。最后表明等量吸附热对扩散系数的估计没有影响。