Abstract

THOMAS, G.E.; MUNOZ, N.; MARINO, B.M.  and  THOMAS, L.P.. Dynamic response of the building envelope walls due to diurnal variations of the outside temperature. An. AFA [online]. 2018, vol.29, n.1, pp.20-28. ISSN 0327-358X.

In this paper results of numerical simulations that solve the non-steady heat equation are presented, thus providing the thermal assessment of typical walls composed of multiple layers of homogeneous materials and subjected to a diurnal variation of the outdoor temperature. The heat flux by conduction is quantified while the decrement factor and the time lag are estimated and compared to the admittance method results, finding a good agreement. Numerical results provide detailed information on the heat flux evolution within the walls, which helps to improve the understanding of complex physical situations associated with multilayer envelopes (and hence, with the insertion of thermal interfaces), and to determine the boundary conditions effects on the results. The effects on layers, which use to remain undercover when general analytical methods are applied, are now showed thus highlighting the importance of the proper choice of material and its localization inside the wall.

Keywords : heat flux; non-steady state; multi-layered wall; numerical solution.

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