保水性建材を設置した建物の表面温度及び熱負荷に関する検討

摘要

本研究では保水性建材を屋根面に設置した建物について、表面温度や熱負荷等の検討を行い、以下の知見を得た。 1)保水性建材を屋根に設置した場合の温度低減効果を二棟の実験建屋を用いて明らかにした。保水性建材の利用により、今回の実験条件では夏期の日中において屋根表面温度は最大20℃、室温は1.2〜1.7℃低下した。%We conducted an outdoor experiment and numerical analysis to clarify the mitigation effects on the surface temperatures and reduction of the air-conditioning loads of buildings equipped with water-retentive building materials. In the outdoors experiment using two housing units in the daytime during summer, the cooling effects of the water-retentive building material were demonstrated by decreases in the roof surface temperature by 20℃, and in the room air temperature by 1.2-1.7℃. Next, a building heat load model was coupled with a simultaneous heat and mass transfer model to confirm whether simulation results were consistent with the observed data for surface temperature and room air temperature. We then implemented case studies using assumptions for standard buildings, and found that the use of water-retentive building material had a cooling load reduction effect of by 9.8-15.1% in the case of a factory and, 9.0-13.8% in the case of an office.