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Green-Manufactured and Recyclable Coatings for Subambient Daytime Radiative Cooling.

Rong Liu1, Zhengui Zhou1, Xiwei Mo1

  • 1Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.

ACS Applied Materials & Interfaces
|October 10, 2022
PubMed
Summary

Researchers developed an eco-friendly, ultrawhite coating for passive daytime radiative cooling. This innovative material significantly reduces building temperatures by reflecting sunlight and emitting heat, conserving energy without electricity.

Keywords:
eco-friendlygreen manufacturinghierarchically porous structureradiative coolingrecyclabilityultrawhite coating

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Passive daytime radiative cooling (PDRC) offers energy-efficient cooling by reflecting sunlight and emitting thermal radiation.
  • Integrating PDRC with building systems can reduce electrical cooling loads.
  • Developing high-efficiency, environmentally friendly PDRC coatings is crucial for widespread adoption.

Purpose of the Study:

  • To develop a simple, scalable, and eco-friendly ultrawhite coating for passive daytime radiative cooling.
  • To achieve high solar reflectance and thermal emittance for effective cooling.
  • To demonstrate the practical applicability of the coating on building surfaces.

Main Methods:

  • Fabrication of ultrawhite coatings using a porous ethyl cellulose matrix and barium sulfate (BaSO4) nanoparticles with green solvents.
  • Characterization of the coating's optical properties, including solar reflectance and thermal emittance.
  • Evaluation of the cooling performance under simulated solar irradiation and assessment of durability and application methods.

Main Results:

  • The ultrawhite coating achieved a record solar reflectance of 98.6% and thermal emittance of 98.1%.
  • The coating demonstrated a subambient temperature drop exceeding 2.5 °C under ~920 W m⁻² solar intensity.
  • The coating exhibited excellent durability, self-cleaning properties, and cost-effectiveness, suitable for various application methods (brushing, rolling, spraying).

Conclusions:

  • A novel, eco-friendly ultrawhite coating was successfully developed for passive daytime radiative cooling.
  • The coating's superior optical properties and practical application methods offer a viable pathway for energy conservation in buildings.
  • This technology presents a significant advancement for sustainable cooling solutions in practical, large-scale building applications.