Abstract
It is necessary to have thermal conductivity of a moist material in order to understand the inner condensation in building walls, heat and moisture transfer in walls and ground wetted by rain. In this paper, the meaning of thermal conductivity of a moist porous material is discussed, based on the theory of heat and mass transfer. The steady state method and the periodic method are considered to be the normal measuring methods, and the meaning of thermal conductivities measured by them is analysed. The equation which gives the errors induced by moisture movement is proposed for the periodic method based on the perturbation method. This equation gives the measurement error in terms of the material properties.
