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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
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All-Season Passive Thermal Management Film with Multifunctionality for Efficient Radiative Cooling and Solar Heating.

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This study introduces a novel dual-mode thermal management device. It efficiently switches between heating and cooling, offering energy-efficient solutions for various applications.

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Area of Science:

  • Thermal Engineering
  • Materials Science

Background:

  • Conventional heating/cooling devices struggle with all-season energy demands.
  • A need exists for adaptable thermal management systems.

Purpose of the Study:

  • To design and demonstrate a dual-mode thermal management device.
  • To enable efficient switching between heating and cooling functionalities.

Main Methods:

  • Fabrication of a device using femtosecond laser-induced graphene (LIG) for heating.
  • Application of a SiO2 hollow microsphere coating for cooling.
  • Utilizing a pull-out mechanism for mode switching.

Main Results:

  • The SiO2 coating achieved 93% reflectivity and 97% infrared emissivity, enabling a 6.3°C temperature decrease.
  • LIG demonstrated 97% solar absorption and high thermal conductivity, resulting in a 35°C temperature increase.
  • The device successfully switched between heating and cooling modes.

Conclusions:

  • The dual-mode device offers effective temperature regulation through adaptable heating and cooling.
  • This technology shows significant potential for applications in agriculture, food preservation, and energy-efficient architecture.