Study on mass transfer of light steel-framed composite walls in cold area

On the base of ANSYS simulation of heat transfer and the theory of moisture permeation, moisture transfer of two slotted light steel-framed composite walls is calculated. The factors which affect moisture accumulation of insulation material during heating period, such as insulation material, finishing material, thickness of insulation layer, indoor environment conditions and outdoor climatic conditions have been analyzed. The results show that the condensation of moisture occurs easily in the insulation material layer far away from the steel studs. From the point of moisture-proof view, walls with polystyrene board are better than that of walls with rock wool. Increasing thickness of insulation layer or decreasing indoor air temperature and relative humidity is favorable to prevent condensation in and on the walls. But the appropriate measures taken can prevent condensation effectively in and on the walls.