论文标题
白天辐射冷却“皮肤”的广义生物启发方法
Generalized bioinspired approach to a daytime radiative cooling "skin"
论文作者
论文摘要
具有强大可操作性的节能冷却材料对于可持续的热管理是必需的。受北极熊皮草的合作热光学效应的启发，我们通过用高度散落的聚乙烯气凝胶的聚二甲基硅氧烷膜来形成柔性且可重复使用的冷却皮肤。由于其高孔隙率为97.9％，量身定制的孔径为3.8 +-1.4微米，可在2.7毫米的厚度下实现0.96的高太阳反射率，高透明度为0.8。在大都市环境中，冷却皮肤与气凝胶的低温电导率低0.032 W/m/k相结合，在中午的亚镜子温度下降为5-6度，在理想的服务条件下估计限制为14度。我们设想，这种广义的双层方法将在夜间到白天辐射冷却，为经济，可扩展，灵活和可重复使用的冷却材料铺平道路。
Energy-saving cooling materials with strong operability are desirable towards sustainable thermal management. Inspired by the cooperative thermo-optical effect in fur of polar bear, we develop a flexible and reusable cooling skin via laminating a polydimethylsiloxane film with a highly-scattering polyethylene aerogel. Owing to its high porosity of 97.9% and tailored pore size of 3.8 +- 1.4 micrometers, superior solar reflectance of 0.96 and high transparency to irradiated thermal energy of 0.8 can be achieved at a thickness of 2.7 mm. Combined with low thermal conductivity of 0.032 W/m/K of the aerogel, the cooling skin exerts midday sub-ambient temperature drops of 5-6 degrees in a metropolitan environment, with an estimated limit of 14 degrees under ideal service conditions. We envision that this generalized bilayer approach will construct a bridge from night-time to daytime radiative cooling and pave the way for economical, scalable, flexible and reusable cooling materials.
