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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Highly effective photon-to-cooling thermal device.

Yanpei Tian1, Lijuan Qian2, Xiaojie Liu1

  • 1Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA.

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|December 19, 2019
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Summary

This study presents an aluminized Polymethylpentene (PMP) thin film for efficient passive cooling. The material leverages the atmospheric transparency window for heat dissipation, achieving a significant temperature drop and cooling power.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Sustainable Energy

Background:

  • Passive radiative cooling utilizes atmospheric transparency windows to dissipate heat into space.
  • Developing energy-efficient cooling solutions is crucial for reducing environmental impact.

Purpose of the Study:

  • To demonstrate a highly effective photon-to-cooling thermal structure using aluminized Polymethylpentene (PMP) thin films.
  • To optimize heat dissipation by matching the material's emissivity to the atmospheric transparency window.

Main Methods:

  • Fabrication of aluminized PMP thin films.
  • Characterization of the film's emissivity and thermal performance.
  • Measurement of temperature drop and radiative cooling power under ambient conditions.

Main Results:

  • The aluminized PMP thin film demonstrated a temperature drop of 8.5 K below ambient temperature.
  • Achieved a radiative cooling power of 193 W/m2 over a one-day cycle.
  • Emissivity was optimized to align with the atmospheric transparency window, minimizing parasitic heat gain.

Conclusions:

  • Aluminized PMP thin films offer a practical and scalable solution for passive radiative cooling.
  • The developed structure effectively utilizes the atmospheric transparency window for efficient heat dissipation.
  • This technology presents a promising energy-saving cooling method.