光触媒外装材を用いた温熱環境実測とシミュレーション: 実証実験棟における日射遮蔽スクリーン併用散水システムの蒸発冷却効果の検討

摘要

Photocatalysts have two major effects. One is self-cleaning and the other is hydrophily. In view of the hydrophily, the outer surface of the exterior materials (exterior walls and glass) of the experimental building (measuring 165.34 square meters) was coated with titanium oxide photocatalysts (TiO_2). When water is sprinkled over the surface, a thin uniform water film is formed on the surface due to the hydrophily, and the sunshine on the surface makes the evaporation cooling on the outer surface of a building can lower the air-conditioning load. The shielding of the sunshine by screens is also effective in reducing the air-conditioning load. The following different conditions of the indoor thermal environment were compared to study the effectiveness of screens. The first case was with screens installed outside, the second was with screens installed inside and the third was without screens. It was found both from the survey and from the simulation that Case 1 with outer screens and water sprinkling most effective in reducing the air-conditioning load among the six cases surveyed.%日射遮蔽に用いるスクリーンを建物の外周部に付ける外付けスク リーン、開口部の内側にカーテン状に付ける内付けスクリーンおよ び外装部への散水システムの熱的効果を実証実験棟の実測で明らか にした。さらに、シミュレーションプログラムを開発し、実測結果 の検証を行い、それらの評価を数値的に捉えることができた。以下 に結果を述べる。