Cooling and heating effects of earth-tube laid underground depth of 2 meters: Investigation through one year at a community center in Takaoka City

Earth-tube system is one of the methods of subterranean heat use, and is applied as a ventilator of a detached residence or small-scale buildings. And the reduction of fresh air loads is expected. In this study, we investigated the earth-tube system installed at Kiduno-syou Community Center in Takaoka City. A vinyl chloride tube of 200 mm in diameter was laid underground by 125 m of the total extension. The burial depth of a tube is about 2.0 m. Based on the data of temperature and relative humidity of diffused air through one year, the cooling and heating effects were analyzed.