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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Imprimir: 1940-2503
ISSN On-line: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2020033651
pages 261-273

NUMERICAL SIMULATION OF THERMAL BRIDGES IN COMPOSITE BUILDING MATERIALS

Mustapha Maliki
LCTPE Laboratory, Civil engineering & architecture department, University Abdelhamid Ibn Badis, 300 Belhacel Road, Mostaganem 27000, Algeria
Nadia Laredj
LCTPE Laboratory, Faculty of Science and Technology, University Abdelhamid Ibn Badis, Mostaganem, Algeria
Hanifi Missoum
LCTPE Laboratory, Faculty of Science and Technology, University Abdelhamid Ibn Badis, Mostaganem, Algeria

RESUMO

Thermal bridges typically occur at the junction of different building components where it is difficult to achieve continuity in the thermal insulation layer. In this paper, a numerical method is presented to investigate the thermal bridge behavior in composite building structures. The general heat transfer conservation equation is implemented in steady-state conditions via the finite element software, Comsol-Multiphysics. The partial differential equation module is then used to solve the heat transfer equation. Temperatures and heat flux are calculated for both thermal conduction and convection. The numerical approach is validated using two-dimensional (2D) and three-dimenaional (3D) models issued from the European standard EN ISO 10211:2007 to ensure the good agreement of the presented numerical model. An exhaustive evaluation of the bridging effects in the considered composite structure benchmark is conducted. The heat flux through inner surface is analyzed over time for a step solicitation and for given boundary conditions. Results are very satisfactory; evolution of temperature heat flux through the thermal bridge is close to that of the corresponding numerical method. For 2D case, all calculations results lie well within the requested 0.1 K difference in temperature and 0.1 W/m difference in heat flow. The 3D results also satisfy the requested 5 × 10-3°C for temperature and 1% for heat flux.

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