Experimental study of heat and moisture coupled transfer in single layer envelope

Heat and moisture transfer of building envelope is an important factor affecting the durability of building, indoor environment and building energy consumption. In order to study the heat and mass coupled transfer law, takes the porous media with single layer envelope as a research object, establishes a 240 mm concrete envelope experiment rig, and measures the parameters such as moisture content, temperature and humidity. The experimental results show that the moisture transfer rate is slow and much lower than that of heat transfer. Different from the temperature distribution, the moisture content is less affected by the boundary condition. The moisture content inside the envelope is always low at both sides and high in the center. In the first three months, especially in the first month, the decline of moisture content is the most obvious. The moisture content at the center point has dropped by 25% in the first month and by 47% after three months.