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Heating and Cooling Curves02:44

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Ultrahigh Passive Cooling Power in Hydrogel with Rationally Designed Optofluidic Properties.

Jipeng Fei1, Di Han1, Xuan Zhang2

  • 1School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore.

Nano Letters
|December 4, 2023
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Summary
This summary is machine-generated.

This study presents a novel hydrogel-based passive cooler that achieves stable subambient cooling in tropical climates. It offers significantly higher cooling power than traditional radiative coolers, even under intense solar radiation.

Keywords:
hydrogelintegrated cooling structureoptofluidic designpassive coolingradiative cooling

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Environmental Engineering

Background:

  • Radiative cooling performance is significantly reduced in tropical climates due to high humidity, strong atmospheric radiation, rainfall, and intense solar irradiation.
  • Existing radiative cooling technologies struggle to achieve effective subambient cooling during the day in harsh tropical conditions.

Purpose of the Study:

  • To develop an integrated passive cooling strategy using hydrogels with optofluidic properties for effective subambient cooling in tropical regions.
  • To investigate the interaction between radiative and evaporative cooling mechanisms under varying hydration and humidity levels.

Main Methods:

  • Development of a hydrogel-based passive cooler integrating radiative and evaporative cooling strategies.
  • In situ studies to analyze radiative cooling performance under different hydration levels and ambient humidity.
  • Performance evaluation under intense solar radiation conditions typical of tropical climates.

Main Results:

  • Demonstrated stable subambient cooling (4-8 °C) even under peak solar radiation (up to 1200 W/m²).
  • Achieved ultrahigh cooling power of approximately 350 W/m², 6-10 times greater than conventional radiative coolers in tropical environments.
  • Quantified the interplay between radiative and evaporative cooling based on hydration and humidity.

Conclusions:

  • The integrated passive cooler effectively overcomes the limitations of traditional radiative cooling in humid, high-solar-irradiance tropical climates.
  • The developed hydrogel cooler offers a promising solution for efficient daytime cooling in challenging environments.
  • Insights gained provide a foundation for designing advanced integrated cooling systems adaptable to diverse climatic conditions.