Ecological analysis of natural ventilated facade system and its performance in Tehran's climate

Abstract

<p>Façade as the most outer part of building has very important role in building’s energy exchange and its thermal comfort.</p><p>Using of ventilated facade have been increased due to its positive points, including aesthetics, energy saving and sustainable approach so it is important to study its compatible in different climate conditions. In the present study to evaluate the effectiveness of this technology in Iran’s climate compared to conventional systems as well as the effect of other factors in improving its performance, five models of a building with different situations have been modeled in Design Builder software and samples were examined in terms of the amount of energy needed to achieve comfort conditions. The result was that buildings with ventilation facades use 40% less energy than the building with conventional facade system. Its effectiveness in improving the cooling performance is better than its performance in the heat and its performance in the southern facade and areas that are exposed to direct sunlight looks much better. Factors such as the effect of height and number of floors also have an impact on system performance.</p>

Passive Strategies for Building Retrofitting: Performances Analysis and Incentive Policies for the Iranian Scenario

“…In addition, passive retrofit actions are usually less invasive, allowing for renovations without changing the structure of historical buildings [26]. One of the most useful passive strategies to decrease energy usage in buildings is installing a second-skin (SS) facade system [17,20,23,[27][28][29][30][31][32][33][34]. The SS facade systems consist of a standard facade, an air cavity, and an additional external skin.…”

“…The SS facade systems consist of a standard facade, an air cavity, and an additional external skin. According to [17,20,23,[27][28][29][30][31][32][33][34], the proper design of the SS facade systems can lead to several environmental and economic advantages; these benefits can be summarized as:…”

“…Several types of research have been performed in the last year to evaluate the effectiveness of SS facade systems in the Iranian climate [27][28][29][30]35,36]. In particular, in Hashemi et al [27], a building with a SS facade system was monitored for two weeks during summer and two weeks during winter in the hot arid climate of Iran to observe the behaviors of the facade both in hot and cold conditions.…”

“…This study showed that, in summer, the cavity is essential to cool down the inner facade in countries, such as Iran, with high solar incidence [27]. In [28], the effectiveness of a SS facade system was investigated by comparing the proposed system to conventional ones. In more detail, five building models, located in Tehran (Iran), were modeled in Design Builder software [37] and examined in terms of both heating and cooling demands to achieve comfort conditions.…”

Numerical Comparison of Thermal Behaviour Between Ventilated Facades

“…There is also a minimum saving in the range of 1.1-2.6% in winter (energy savings for heating). The article by Mahdavinejad and Mohammadi [16] presents a numerical study comparing the ETICS facade with a ventilated facade for a building located in Tehran. The energy savings in summer and winter were recorded at 27% and 33%, respectively.…”