Paper Conference

Proceedings of BSA Conference 2017: Third Conference of IBPSA-Italy


A Comparison of the Performance of Two- and Three-Dimensional Thermal Bridge Assessment for Typical Construction Joints

Ulrich Pont, Ardeshir Mahdavi

Abstract: The consideration of thermal bridges in building envelopes has gained importance in recent years. This is due to their potential impact on the overall thermal building performance of highly insulated buildings. Moreover, energyefficient buildings tend to be more sensitive to problems associated with thermal bridges, such as surface condensation, mould growth, and thermal comfort issues. Therefore, planners must minimize the negative impact of thermal bridges. Although user-friendly thermal bridge simulation tools are available, they are not yet widely used in practice. Instead, planners often rely on generic details from the building construction literature. The thermal performance of such details often remains unknown given the wide range of possible building materials (and their thermal properties). In this contribution, we present the results of a thermal bridge simulation of a set of such standard details. Thereby, we assessed vertical sections through typical constructions via 2D thermal bridge simulation, as well as 3D corner situations constituted by such 2D sections. The aim was to address two research questions: i. How do typical details perform, given the large range of thermal properties of applied materials? ii. How does the performance of the 3D-thermal bridges compare to their constituent 2D-details, and is it possible to use 2D results to approximate the results of 3D thermal bridges?
Pages: 367 - 374