雨水の蒸発を利用した二重屋根採冷システムの開発と室内熱環境の実測

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This paper describes passive cooling effect of double-roofing system with water spraying. The upper roof is thermally-well insulated so that it functions as a shading, and the lower roof, namely the ceiling is composed of glass fiber of 1mm and metallic board of 0.5mm so that it functions as a radiant cooling panel. The evaporation of water taking place on the upper surface of the lower roof provides with the coolness into indoor space. The authors made a couple of field measurement of the indoor thermal environment of a wooden house in Tokyo the roof of which is equipped with the double-roofing system. The following are findings. In a room with the double-roofing system the residents did not feel discomfort during the period of the measurement, in which the MRT ranged 27〜32℃, the indoor air velocity 0.5〜1.0 m/s, the room air temperature 32〜35℃. The residents feel comfortably cool due to the combination of solar control of the upper roof and also bamboo made "sudare" screen, natural ventilation and radiant cooling by the ceiling. The internal surface of ceiling of the double-roof emits radiant "cool" exergy of 0.065 W/m^2 and convective "cool" exergy of 0.19 W/m^2. While the other surfaces of the indoor space emits radiant "warm" exergy.
社団法人日本建築学会の論文
2003-11-30