Paper Conference

Proceedings of ASim Conference 2012: 1st Asia conference of IBPSA-China, Japan, Korea


The inference of window insulation performance and interior materials providing moisture sorption and desorption charactaristics on indoor hygrothermal environment.

Yuki Sato, Akihito Ozaki

Abstract: Improving insulation of existing houses is very important for the civilian sector to reduce CO2 emission. According to the Basic Energy Plan for Japan, one of the targets is the doublingof the number of existing houses to undergo energy saving modifications. However, it is hard to say that large-scale insulation improvement construction is common. The most popular method of improving insulation performance is insulation improvement of the existing windows. It is well-known that insulation performance of windows is lower than other areas of the house and improving insulation contributes to improvement of thermal comfort and heat load reduction. On the other hand, humidity environment after improving window insulation has not received much attention. As long as the entire outer surface of buildings is insulated, there is concern that humidity environment in low thermal-insulated places and space will be worsened. In this research, humidity environment change of the entire reinforced concrete construction apartment buildings with no insulation after window insulation improvement was made clear using numeric calculation, and humidity environment improvement effect by the use of building materials to regulate indoor humidity was studied. The results are as follows. 1)Room temperature becomes higher by improving window insulation, and the amount of condensation on the window surface greatly decreases. 2)The amount of condensation on the window surface decreases by improving window insulation, but absolute room humidity increases. 3)In comparatively warm regions such as Tokyo, absolute humidity does not increase much by improving window insulation. 4)Without improving entrance door insulation, the amount of dew condensation on entrance doors increase by improving window insulation. 5)Frequency of appearance of high humidity zones can be reduced by using building materials to regulate indoor humidity in the living room or closets. 6)Slight condensation on the window surface after improving window insulation can be reduced by using building materials to regulate indoor humidity. 7)Building materials to regulate indoor humidity are not overlyeffectiveinreducing condensation on entrance doors.
Pages: 126 - 132