Effect of Thermal Bridges on the Indoor Thermal Environment of Passive Buildings in Cold and Dry Climate Zones

다국어 초록 (Multilingual Abstract)

The development of passive buildings has been given more attention to realize the energy-saving and low carbonization of buildings. Controlling thermal bridges in the external envelope is the primary technological approach in achieving low-energy passive buildings. There are many climatic zones in China, and it is necessary to conduct in-depth research on different environments to clarify the impact of thermal bridge treatment on passive buildings under special conditions. Therefore, the researchers developed a simulation model in Ansys fluent in conducting a 24-hour transient simulation study of the thermal bridge design for passive buildings in cold, dry climates. The simulation model consists of the indoor environment and building envelope. Then the actual meteorological parameters in cold and dry climate regions were used as the boundary conditions of the proposed model to be close to reality. In this case, the temperature distribution inside the envelope layers, indoor temperature variation, and thermal energy consumption were studied under passive design (without thermal bridge) and conventional design (with thermal bridge). The analysis results showed that better thermal bridge treatment made it more difficult for the external cold air to pass through the outer structural layer of the envelope to the inner structural layer under the passive design. In addition, the indoor temperature under the passive design was 1oC higher than that under the conventional design. Moreover, the heating energy consumption under the passive design was about 0.8W/m2 lower than that under the conventional design. The findings of this paper are intended to provide reference for designers and researchers in understanding the impact of thermal bridges on the indoor thermal environment of passive buildings in cold and dry climates.

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