Building Simulation: An International Journal

Article Title

An experimental investigation of the wind tower-assisted by the underground passive cooling system


wind tower, cooling, underground channel, Naghb


Wind towers have been used for the buildings passive cooling, in warm and dry regions. The wind towers are employed to capture the wind from the external air stream and direct it into the buildings and facilitate the circulation of the air from ambient through the building. The wind towers are not able to decrease the air temperature. In some locations of Iran such as Bam, the wind tower outlet was first directed into an underground channel, before being introduced into the building. The channel was built under the garden to employ the humidly of soil to cool down the air. In this paper, a small scale model of underground air-earth heat exchanger is employed to assess the system performance. The paper reports the effect of the garden irrigation time, humidity and temperature diurnal variations of the ambient air on the channel performance. The results show that when the garden is irrigated, and soil moisture content is at the higher level, the maximum average cooling performance of the channel is achieved, 51.30%. The temperature drop of the air inside the channel is due both the evaporation of moisture from the channel wall and the lower temperature of the soil than air.


Tsinghua University Press