In order to study the influence of linear thermal bridge with different thermal insulation methods on the thermal performance of the envelope of residential buildings in Guangxi,taking a residential building with shear wall structure as an example,the linear heat transfer coefficient of typical linear thermal bridges and the thermal performance of the external wall of the case building were numerically simulated and analyzed by using the BECS energy-saving design software. The results show that the linear thermal bridge has a significant effect on the heat transfer of the wall,and the proportion of the average heat transfer coefficient of the external wall caused by the linear thermal bridge is nearly one third. When the external wall adopts internal insulation,the linear heat transfer coefficient at the junction of external wall and internal wall,and the junction of external wall and vertical overhanging floor is the largest,followed by the junction of external wall and floor,and the junction of external wall and horizontal overhanging floor;When external insulation is used for external wall,the linear heat transfer coefficient at the junction of external wall and vertical overhanging floor is the largest,followed by the upper,lower,left and right openings of doors and windows,and the junction of external wall and horizontal overhanging floor. Meanwhile,it is found that the linear thermal bridge with different insulation methods has different influence on the average heat transfer coefficient of the external wall,and the linear thermal bridge with internal insulation method has higher influence on the average heat transfer coefficient of the external wall than that with external insulation;And the thicker the insulation material,the greater the influence of the linear thermal bridge on the average heat transfer coefficient of the exterior wall.
linear heat transfer coefficientlinear thermal bridgeaverage heat transfer coefficient of external wallresidential building