居室・外気からの空気移動が基礎断熱した床下温湿度環境に与える影響

概要

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The measurement technique of air leakage between foundation wall and sill, subfloor joints are shown, 6 houses with platform floor are measured using this method. It is clarified that the percentage of air leakage of foundation top and sill are 18.9% to 58.7% of all air leakage of house. And it also found that leakage area of floor is from 1.3 to 3.2 cm^2/m^2. Applying these values to calculation model, simultaneous heat and moisture transfer simulation, considering multi-room airflow by stack effect, wind and mechanical pressures, are done to clarify the hygrothermal behavior in the crawl space with vertical edge insulation on foundation wall. It makes clear that air leakage around floor changes airflow rate from indoors and outdoors to the crawl space a lot, especially in summer, that carry high humid outdoor or indoor air. High temperature difference between south side and north side of residential room also accelerates airflow from residential room. The effect of hygroscopic materials, such as diatomite grains, is also studied, and found that it has effectiveness on decrease the amplitude of mixing ratio, also it makes relative humidity moderately lower.
社団法人日本建築学会の論文
2001-10-30