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.
In recent years, as the need for development of low-carbon architecture increases, practical use of the natural energy that surrounds buildings is attracting attention. Heat/cool trench systems make use of one such natural energy, subterranean heat. These systems reduce the fresh air load by introducing outside air through trench that pass beneath the bottom floor-slab before blowing the air indoors. This study involves a year-round measurement survey of outside air and indoor outlet temperature and humidity at school building. The effectiveness of using subterranean heat in a building is examined by calculating heat extraction in summer and heat addition in winter.
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