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2017-03-14 - Article/Dans un journal avec peer-review - Anglais - 32 page(s) (Soumise)

Quinten Julien , Feldheim Véronique , "Mixed method: equivalent wall method for dynamic modelling of thermal bridges in building envelope: Principles and application to three 2-D thermal bridges" in International Journal of Thermal Sciences

  • Edition : Elsevier Science, Paris (France)
  • Codes CREF : Recherche énergétique (DI2290), Transfert de chaleur (DI2211)
  • Unités de recherche UMONS : Thermique et Combustion (F704)
  • Instituts UMONS : Institut de Recherche en Energétique (Energie)

Abstract(s) :

(Anglais) This paper presents a mixed method to determine a 1-D three-layer wall having the same static and dynamic behaviours as a multidimensional thermal bridge. It is based on the calculations of thermal resistance, heat capacity, structure factors and an objective function using harmonic heat fluxes features. This mixed method is applied to three 2-D details. The heat flux through inner surface is analysed over time for given boundary conditions: a sinus evolution of the inside temperature and a severe or a more realistic evolution of the outside temperature. Results are really satisfactory, evolution of heat flux through the thermal bridge is close to that of the corresponding equivalent wall. For an outside temperature profile (Te) close to real data, the error on integral value of heat flux is less than 1% in each case. The results for equivalent walls are significantly better than for a classical 1-D evaluation: for a severe evolution of Te the mean error is 6 to 28 times lower in the tested cases.


Mots-clés :
  • (Anglais) Structure factors
  • (Anglais) Heat conduction
  • (Anglais) Building energy simulation
  • (Anglais) Thermal bridge
  • (Anglais) Dynamic simulation
  • (Anglais) Equivalent wall