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Area of Science:

  • Materials Science
  • Sustainable Energy
  • Nanotechnology

Background:

  • Global warming necessitates innovative cooling solutions.
  • Radiative cooling offers a passive, energy-efficient alternative.
  • Commercializing radiative cooling faces challenges in performance and scalability.

Purpose of the Study:

  • To develop a scalable, cost-effective, and environmentally friendly radiative cooling coating.
  • To investigate the cooling performance of a novel methyl cellulose-diatomite composite.
  • To assess the potential for commercial application of the developed coating.

Main Methods:

  • Fabrication of a green radiative cooling coating using methyl cellulose, diatomite, and water.
  • Characterization of the coating's optical properties (solar reflectance and thermal emissivity).
  • In-situ measurement of the coating's subambient temperature drop under direct sunlight.

Main Results:

  • The coating achieved high solar reflectance (94%) and thermal emissivity (0.9).
  • A maximum subambient temperature drop of 6.1 °C was recorded on sunny days.
  • The coating demonstrated a 2.5 °C temperature drop on cloudy days.
  • The fabrication process is scalable, cost-effective, and uses naturally sourced materials.

Conclusions:

  • The developed methyl cellulose-diatomite coating is a promising solution for passive radiative cooling.
  • Its environmental friendliness and cost-effectiveness support commercial viability.
  • This approach offers a sustainable pathway to mitigate energy challenges from global warming.