Creating an Eco‐Friendly Building Coating with Smart Subambient Radiative Cooling

Abstract Subambient daytime radiative cooling (SDRC) provides a promising electricity‐ and cryogen‐free pathway for global energy‐efficiency. However, current SDRC systems require stringent surface designs, which are neither cost‐effective nor eco‐friendly, to selectively emit thermal radiation to outer space and simultaneously maximize solar reflectance. Here, a generic method is developed to upgrade the conventional building‐coating materials with a peculiar self‐adaptive SDRC effect through combining particle scattering, sunlight‐excited fluorescence, and mid‐infrared broadband radiation. It is also theoretically proved that heat exchange with the sky can eliminate the use of resonant microstructures and…

• CU
  City University of Hong Kong

  Award: 9610434
• NN
  National Natural Science Foundation of China

  Awards: 51873200, 61535004
• HK
  Hong Kong Polytechnic University
• RI
  Research Institute for Sustainable Urban Development, Hong Kong Polytechnic University