可扩展的随机制造的玻璃聚合物混合元材料,用于白天的辐射冷却
Yao Zhai1, Yaoguang Ma1, Sabrina N David2
1Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309, USA.
Science (New York, N.Y.)
|February 11, 2017
概括
这项研究提出了一种用于被动辐射冷却的新型超材料. 这种材料具有很高的红外辐射率和太阳能透明度,即使在直接阳光下也能有效冷却,并为能源应用提供可扩展的制造.
科学领域:
- 材料科学
- 纳米技术
- 热力学
背景情况:
- 无源辐射冷却利用红外辐射散热空间.
- 一个主要的挑战是开发具有高热发射率和低太阳吸收率的材料.
研究的目的:
- 设计一种高效的被动辐射冷却的超材料.
- 通过大气窗口实现高红外发射,同时保持太阳透明度.
- 为了证明可扩展和经济的制造辐射冷却材料.
主要方法:
- 在聚合物矩阵中嵌入共振极性介电微球以创建超材料.
- 描述元材料的光学特性,包括太阳光谱的透明度和红外辐射.
- 在银色背面直接阳光下测量辐射冷却功率.
主要成果:
- 在大气窗口内,超材料的红外发射率高于0.93.
- 它显示出完全透明的太阳光谱.
- 在正午直接阳光下达到93W/m2的冷却功率.
结论:
- 开发的超材料有效地实现了被动辐射冷却.
- 滚筒制造证明了该技术在能源应用中的可行性.
- 这种方法为辐射冷却提供了可扩展和经济的解决方案.
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