Study on the High Humidity in Underfloor Space of Detached Houses During Summer. Part2 Actual Measurement in Foundation-insulated Houses that Have Air Vent on Floor

Abstract

This study demonstrated that keeping windows open/closed and using air conditioning has an impact on humidity in the crawlspace of foundation-insulated houses with air vents. In the house, the central crawlspace zone and areas directly under each vent were prone to high humidity. The central crawlspace zone had low temperatures a higher proportion of the time than the other points, which was the cause of the high relative humidity in the central crawlspace zone. As can be seen, the relative humidity in the crawlspace dropped approximately 20% when the air conditioning was in use. This demonstrates that the relative humidity in the crawlspace directly under the floor air vent varied greatly depending on whether or not the air conditioning was being used it can be concluded that the airborne moisture entering through each vent reached as far as the central crawlspace zone and caused the absolute humidity there to rise to the same extent as that directly under each air vent, and that the relative humidity in the central crawlspace zone rose more than in other zones due to the low temperature.