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Passive directional sub-ambient daytime radiative cooling.

Bikram Bhatia1, Arny Leroy1, Yichen Shen2

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Optics

Background:

  • Passive daytime radiative cooling (PDRC) typically requires complex, expensive nanophotonic materials with specific spectral properties.
  • Existing PDRC methods face challenges in achieving efficient cooling under direct sunlight due to solar absorption.

Purpose of the Study:

  • To demonstrate a directional approach to passive radiative cooling that bypasses the need for spectrally selective emitters.
  • To achieve sub-ambient cooling during the day using readily available, low-cost materials.

Main Methods:

  • Utilized a directional cooling strategy by exploiting the angular confinement of solar irradiation.
  • Employed a setup with a polished aluminum disk for solar reflection and a white infrared-transparent polyethylene cover to minimize diffuse solar irradiation.
  • Conducted experimental measurements around solar noon to quantify cooling performance.

Main Results:

  • Achieved a minimum temperature of 6°C below ambient temperature.
  • Demonstrated a maximum cooling power of 45 W/m².
  • Validated the effectiveness of the directional cooling approach using simple, low-cost materials.

Conclusions:

  • The proposed directional passive radiative cooling method offers a cost-effective and practical alternative to traditional PDRC technologies.
  • This approach has the potential to enhance existing cooling systems and advance thermal management and refrigeration solutions.
  • The use of common materials makes this cooling strategy scalable and widely applicable.