Abstract: The Naturally Ventilated Double-Skin Facades (NVDSF) functional mechanism is based on thermal performance of the components and airflow in the cavity. In this paper, 80 simulation scenarios by changing the geometric features of NVDSF are examined. To obtain the optimal duration of calculations, the simulations of different scales of the 3D model and mesh dimensions were examined and 33% scale 3D model with 8 mm meshes dimension were determined. In this study, 324 different simulation scenarios were investigated to assess the effect of NVDSF performance. The results showed that excessive increase or decrease of ventilation flow deviates the NVDSF from the optimal thermal performance. The best thermal performance of the NVDSF occurs in those scenarios where at the inlet, the air flow is divided into two parts, a part is directed to the shading device and the other part directed to the inner glass. The mean reduction of the transmittance heat flux of the inner glass surface for this scenario was obtained 9.7% compared to the standard commercial grille mode of the inlet of NVDSF-box window type.

Keywords: Double skin facade, Natural ventilation, CFD simulation, Geometric features, Air inlet features, Thermal Performance

Pages: 29-42

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