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関連する概念動画

Radiation: Applications01:17

Radiation: Applications

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
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Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
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Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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階層的に構造された高反射率の受動的な放射冷却セラミック

Kaixin Lin1, Siru Chen1, Yijun Zeng2,3

  • 1School of Energy and Environment, City University of Hong Kong, Hong Kong, China.

Science (New York, N.Y.)
|November 9, 2023
PubMed
まとめ

新しいセルラーセラミックは 99.6%の太陽反射率と高い熱放出率で受動的な放射冷却を実現します. この耐久性のある材料は,特に建物の建設において,広範な用途に相当するエネルギー節約の可能性を秘めています.

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TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method
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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 熱力学について

背景:

  • パッシブ放射冷却技術は,コスト,互換性,耐候性,太陽光反射に制限があります.
  • 既存のナノフォトニック構造は高価で統合が困難で ポリメリックの代替品は劣化して反射が悪い.

研究 の 目的:

  • 性能と耐久性を向上させる新型の被動放射冷却材料を開発する.
  • 現行の放射冷却技術の限界を克服し,実用的な応用を図る.

主な方法:

  • 高光散射のために設計されたセルラーセラミック構造の開発.
  • セラミックの太陽反射性,熱放出性,冷却性能の特徴.
  • 色,耐候性,機械的強度,およびライデンフロスト効果抑制を含む材料の特性評価.

主要な成果:

  • 開発されたセルラーセラミックは,ほぼ完璧な太陽反射性 (99.6%) と高い熱放出性を表しています.
  • 直射太陽光下での冷却能力が130W/m2を超える連続的な環境下冷却を実現する.
  • 優れた耐候性,機械的強度を示し,ライデンフロスト効果を抑制しました.

結論:

  • セルラーセラミックは,受動的な放射冷却に耐久性があり,多用途のソリューションを提供します.
  • 材料の性能と特性により,商業化が容易になり,特に建物の建設に適しています.
  • この技術は効率的な冷却ソリューションを通じて,世界的なエネルギー節約の大きな可能性を秘めています.