Simulation study on thermal bridging of wall in cold regions under the coupled heat and moisture transfer
Under cold region climatic conditions,a thermo-humid coupling model is established using the COMSOL Multiphysics simulation software to simulate the thermal bridge at the corner formed by the reinforced concrete column and the red brick masonry wall.The results indicate that the effect of moisture transfer leads to lower internal surface temperatures of the wall compared to when only heat transfer is considered,and the impact of moisture transfer on the thermal conductivity of building materials cannot be neglected under actual working conditions.The influence of thermal bridges increases the heat flux of the enclosure structure by 19.6%,and the area affected by thermal bridges is about 0.4 m away from the most unfavorable point.With the same thickness of insulation board,the internal surface temperature of the wall with external insulation is higher than that with internal insulation,resulting in better insulation effect.As the thickness of the insulation board increases,the internal surface temperature of the wall rises,and the heat flux on the internal surface of the wall decreases.To reduce the heating energy consumption of the room in winter,the condensation phenomenon on the wall can be resolved by external insulation at the thermal bridge locations.
coupled heat and moisture transferthermal bridge effectdew point temperatureheat and moisture simulation
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