Model of ventilated façade in buildings by using CFD techniques

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In some countries, summer over-heating is a big problem in a building’s energy
balance. Ventilated façades are a useful tool when applied to building design, especially in
bioclimatic building design. A ventilated façade is a complex, multi-layer structural solution
that enables dry installation of the covering elements.
The objective of this paper is to quantify of the improvement in the efficiency of the thermal
behaviour of buildings when this sort of façade is installed. These improvements are related
to the ventilation capacity of the additional structure to the shield mainly for saving cooling
power in summer in warm countries. This effect is due to convection produced in the air gap
of the façade. This convection depends on the air movement inside the gap and the heat
transmission in this motion. These quantities are mathematically modelled by
Computational Fluid Dynamics (CFD) techniques using a commercial code: STAR CCM+.
The proposed method allows an assessment of the energy potential of the ventilated façade
and its capacity for cooling.

Author Company: 
Universidad Politécnica de Valencia, KERABEN GRUPO. SA
Author Name: 
P. Amparo López-Jiménez
Miguel Mora-Pérez
Gonzalo López-Patiño
Miguel A. Bengochea Escribano