Open AccessNumerical modelling of point thermal bridge’s impact on the thermal performance of facade systems
Author(s) -
Ligia Moga,
Ioan Moga
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1141/1/012018
Subject(s) - facade , building envelope , thermal , masonry , bridge (graph theory) , thermal bridge , point (geometry) , computer science , envelope (radar) , structural engineering , constructive , sensitivity (control systems) , thermal transmittance , architectural engineering , environmental science , engineering , materials science , thermal resistance , thermal insulation , mathematics , geometry , physics , process (computing) , electronic engineering , composite material , operating system , telecommunications , layer (electronics) , medicine , radar , meteorology
Starting with 31 December 2020 all new buildings, as well as existing ones, must comply with the nearly Zero Energy Buildings levels, as defined by each member state. A very important design criteria is the one regarding an accurate assessment of both linear and point thermal bridges of the building envelope. Usually, point thermal bridges are either not considered in calculations or are assessed by using simplified methodology as described by the standard EN ISO 6946/2017. This is due to the modelling and calculation complexity required in assessing them. Therefore, in several situations the impact is underestimated, and the thermal performance results do not offer a clear image of the building’s thermal performance. Thus, the paper focuses on the modelling and simulation of several constructive solutions for façade systems, aiming to identify a correlation between the geometrical and thermal characteristics of fixing components and the thermal performance of the facade. The studied case scenarios include two types of masonry walls, of 240 and 365 mm, that are thermally insulated in various thicknesses using an ETICS system. A sensitivity analysis is also performed to define a correlation between all the components that define the system and the point thermal bridge impact magnitude. The results of the study indicate an increased impact with a direct consequence on the energy performance of the building.