jailcd2020069: Thermal Performance of Structurally Different Wall-to-Floor Thermal Bridges

Abstract

The improvement of thermal insulation performance of building exterior walls leads to the increasing proportion of heat loss caused by thermal bridges. Currently, the Chinese government is boosting the development of buildings with self-insulation wall. However, the aforementioned heat loss is rather severe in the building envelope with self-insulation wall as the thermal bridges stay uninsulated, which results in extra energy waste and carbon emission. The thermal bridge with the most massive heat flux is the wall-to-floor thermal bridge (WFTB), which was classified into three types according to the different distances between the beam and exterior wall surface (Ds) in this paper. Moreover, this paper defined three new indexes to assess the thermal performance of WFTB comprehensively. They are heat flow rate caused by thermal bridges (QTB), influencing area (Linf), and variation of the temperature (Tvar). Both real scale (1:1) experiments and numerical models were adopted to investigate the thermal performance of WFTB in our study. The thermal bridge with half wrapped beam structure is suggested in actual engineering project as it has a low QTB and the least Linf relatively few wall material usage, which helps to decrease the energy consumption and carbon emission.