Study on Condensation Behavior in Semi-underground Space

- Examination of Countermeasures by Analytical Model Considering Influence of Ground Moisture

Abstract

For an uninhabited semi-underground dwelling unit, it was show that the ground moisture moved to the room air through concrete walls and the room air humidify became higher in winter and that condensation on the window occurred due to it. In this paper the influences of increase in ventilation rate in winter and addition of water-proofing membrane to the inner side of concrete wall on the ground were studied by using an analytical model of heat and moisture transfer considering the influence of the ground moisture. When ventilation rate is increased to 1.0 (1/h) in winter, condensation on the window surface in the room does not occur in winter. In addition, it is possible to block the migration of moisture from the ground to the room air and to reduce the relative humidity in the room by 20% by adding the waterproof membrane to the inner side of walls on the underground wall, with the increase in the risk of condensation on the wall surface in summer acceptable.