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Janus Interface Engineering Boosting Visibly Transparent Radiative Cooling for Energy Saving.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Visibly transparent radiative cooling (VTRC) is crucial for simultaneous lighting and cooling in buildings and vehicles.
  • Optimizing VTRC performance requires balancing visible light transmittance and thermal radiative properties.
  • Internal thermal radiative performance is critical for effective cooling applications.

Purpose of the Study:

  • To design and evaluate a Janus VTRC coating with tunable internal thermal radiative properties.
  • To investigate the potential for energy savings in buildings using the developed VTRC technology.
  • To achieve simultaneous visible light transmission and efficient radiative cooling.

Main Methods:

  • Fabrication of a Janus VTRC coating using PDMS and a TiO2/Ag/TiO2 near-infrared reflector.
  • Experimental characterization of optical properties: visible transmittance, solar reflectance, and thermal emittance.
  • Evaluation of cooling performance by measuring temperature drop and calculating energy savings.

Main Results:

  • The outer surface achieved 70% visible transmittance, 40% solar reflectance, and 94% thermal emittance in the atmospheric window.
  • The inner surface exhibited tunable thermal emittance (90% or 1%), acting as a radiative conductor or barrier.
  • An average temperature drop of 14.6 °C was recorded, with potential annual cooling energy savings of 34-44% in Chinese cities.

Conclusions:

  • The developed Janus VTRC coating offers a dual-functionality solution for energy-efficient buildings and vehicles.
  • Tunable internal thermal emittance provides adaptability for diverse climate conditions (hot and cold).
  • This technology presents a promising strategy for simultaneous lighting and cooling, significantly reducing energy consumption.