Study of Four Passive Second Skin Façade Configurations as a Natural Ventilation System During Winter and Summer

Youssef Hamidi,Mustapha Malha,Abdellah Bah

doi:10.5755/j01.sace.28.1.27728

Youssef Hamidi, Mustapha Malha + Show 1 more

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https://doi.org/10.5755/j01.sace.28.1.27728

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Abstract

The fight against climate change is a significant challenge, resulting mainly from the linear and extensive exploitation of natural resources, particularly fossil fuels. Its impacts are now recognized. The current climate models are neither sustainable nor ecological in economic and social terms, especially as we live in a century marked by galloping demography and urbanization. Researchers worldwide have paid great attention to passive solar design strategies such as double skin or Second Skin Façade. From this point, the present work aims to contribute to a better understanding of the feasibility of using a passive façade as a useful technology for natural ventilation to achieve potential energy savings and improve thermal comfort and indoor air quality. For this purpose, a parametric study was conducted for a room with four different southern facade configurations in six Moroccan climatic zones; the difference between each lies in the vent's position in the entrance and exit. This process was done by using COMSOL Multiphysics software. Velocity and volume flow rate fields were analyzed. The proposed configurations provided an average volume flow rate between 200 m3/h and 400 m3/h for a surface of 1 m2 of southern façade with an air vent area of 0.1mx0.2m.

Highlights

Whereas Passive Façade has proven to be beneficial concerning heating, some researchers such as (Bajc et al, 2015) have shown that the Passive Façade can be an additional source of thermal loads in summer conditions; they carried out a 3D Computational fluid dynamics (CFD) under ANSYS software of a room with a southern passive façade, protected by photovoltaic stripes, during a typical summer day
The air velocity variation has an essential influence on the natural ventilation, heating, and cooling potential of Passive Façades
The mathematical description and CFD simulation results are given in this article, and the results are analyzed and discussed in depth

Summary

Introduction

Whereas Passive Façade has proven to be beneficial concerning heating, some researchers such as (Bajc et al, 2015) have shown that the Passive Façade can be an additional source of thermal loads in summer conditions; they carried out a 3D Computational fluid dynamics (CFD) under ANSYS software of a room with a southern passive façade, protected by photovoltaic stripes, during a typical summer day. The Passive Façade’s effectiveness in enhancing natural ventilation did not appear to receive the same amount of attention, as did the study analyze the heating/cooling potential of Passive Façades. The air velocity variation has an essential influence on the natural ventilation, heating, and cooling potential of Passive Façades. Given this literature gap, this study aims to obtain the velocity distribution and the airflow rate in a Passive Second Skin Façades. A comparative study of four different Passive Façades configurations across a range of Moroccan climatic zones to identify the optimum configuration inducing better indoor natural ventilation and improving thermal comfort was carried out to achieve the study’s objective. The mathematical description and CFD simulation results are given in this article, and the results are analyzed and discussed in depth

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