The joints in dry-connected assembled buildings caused significant heat transfer unevenness between joints and walls,which has an important impact on wall heat transfer and building energy consumption.The non-uniform heat transfer characteristics of dry-assembled exterior walls are summarized by site testing.The cumulative temperature difference ratio(T′)of the inner surface of exterior wall is proposed to quantitatively evaluate the non-uniformity of heat transfer of wall,and the criterion of non-uniformity of heat transfer of dry-assembled wall is determined.The equivalent heat transfer coefficient(K′T)is used to evaluate the influence area of non-uniform heat transfer of joints.The influence of non-uniform heat transfer on building heating energy consumption is analyzed.The results show that the temperature fluctuation of the assembled wall is large on both sides of the joints,and the more complex the wall structure is,the more significant the fluctuation is.The non-uniform influence area of dry-assembled wall joints is obviously larger than that of traditional brick-concrete buildings.The larger is,the more uneven the wall heat transfer is,and the greater the building heating energy consumption is.The uneven heat transfer of the wall caused by the increase of 5 mm joint width makes the building energy consumption change about 3%~4%,the change of the prefabricated wall containing air layer is particularly large,about 3.2%~6.7%.
prefabricated buildingdry connection splice seamheat transfer in wallsnon-uniformity