Paper Conference

Proceedings of Building Simulation 2021: 17th Conference of IBPSA


Thermal bridges numerical study in building retrofitting and ground model coupling with Whole building energy software “EnergyPlus”

Ali El Saied 1,2, Chadi Maalouf 1, Timea Bejat 3, Etienne Wurtz 4
1 University of Reims Champagne-Ardenne, MATIM « MATériaux et Ingénierie Mécanique », Reims, France
2 Univ Grenoble Alpes, CEA, LITEN, DTS, LELA, INES, F-38000 Grenoble, France
3 Univ Grenoble Alpes, CEA, LITEN, DTS, LPM, INES, F-38000 Grenoble, France
4 Univ Grenoble Alpes, CEA, LITEN, DTS, INES, F-38000 Grenoble, France

Abstract: Today in France, building sector represents 44% of final energy consumption (Energie dans les batiments, 2016). Nowadays, heat losses through the foundation are more and more affecting energy consumption (Dmytro 2017). Actually, different models (Martin 2012; Baba 2015) calculate thermal bridges (TB) and heat transfer via slab, foundation and soil. The aim of this work is to highlight the importance of calculating ground thermal bridges in slab on grade houses, and propose a new model where heat and humidity conditions are taken into account. First results were obtained with THERM software to determine the impact of wall-slab junctions under several solutions (500 kWh reduction). Then, we developed a numerical model in Python and coupled it with EnergyPlus software to calculate slab temperature and moisture transfer. The model is validated against Benchmark analytical results.
Keywords: Thermal bridges, Heat and moisture transfer, Energy consumption, Renovation, EnergyPlus.
Pages: 2211 - 2218