Improvement of Baad-Gir performance using underground channel

Since the electricity and the other modern energy sources had not been developed in the past, human being inevitably was trying to find ways to provide comfort of living. One of these cases is Baad-Gir which since a long time ago has been used and appreciated by the general public in hot and dry climate zones dwellers. Now, in addition to growing tendency of researchers to use renewable energy, they are more than willing to improve performance of traditional methods. In the present work, a method has been proposed and investigated to provide room air based on using underground channel. Since the sub- surface soil temperature is much lower than the surface and due to the large volume of soil, it can be considered and used as a heat sink, without any costs and power consumption. In this work, two channels are considered, dry one which is modeled according to soil temperature and the other wet one, via using Ghanat or by adding water manually. Results are compared and it is concluded that this method could be effectively used to decrease temperature of entrance air to the building.