都市熱島に対する放射性冷却のためのスペクトル工学繊維

Ronghui Wu¹, Chenxi Sui¹, Ting-Hsuan Chen^1,2

¹Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA.

Science (New York, N.Y.)

|June 13, 2024

まとめ

新しい放射性冷却繊維は個人的な熱的快適さを提供しますスペクトル的に選択された階層構造 (SSHF) は,都市部の熱島における熱増益を最小限に抑え,ブロードバンドエミッターの性能を2.3°C上回る.

科学分野:

材料科学
繊維工学
熱工学

背景:

放射性冷却繊維は地球の気温上昇に伴い個人の熱的快適性を高めます
都市熱島効果は,周囲の放射線を吸収することで,繊維の冷却の効率を低下させます.
既存の冷却ファブリックは周囲の都市環境からの熱の獲得を緩和するために苦労しています

研究の目的:

都市部での熱増強を最小限に抑える新しい繊維を開発する
選択的な熱放出特性を有する織物を設計する.
シミュレートされた都市条件下での新しいファブリックの性能を評価する.

主な方法:

分子設計を用いた中赤外線スペクトル選択的階層構造 (SSHF) の製造.
太陽光スペクトルの反射性を高めるためにナノ-マイクロハイブリッド繊維構造を組み込む.
シミュレートされた屋外都市シナリオで織物の熱性能をテストする.

主要な成果:

SSHFはMie散乱により高い太陽光スペクトル反射率 (0.97) を表している.
繊維は大気伝達窓内で主導的な放出性を示し,熱の純増益を最小限に抑えます.
SSHFは,シミュレートされた都市環境でブロードバンドエミッターよりも2.3°C低い温度を達成しました.

結論:

開発されたSSHFは,周囲からの熱の獲得を効果的に減らし,都市環境に適しています.
繊維の冷却性能を向上させるには,スペクトル的に選択的な放出と高い太陽反射性が重要です.
SSHFは,困難な都市熱条件で,ウェアラブルな個人用冷却のための有望なソリューションを提供します.

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