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Three-Dimensional Printable Nanoporous Polymer Matrix Composites for Daytime Radiative Cooling.

Kai Zhou1, Wei Li2, Bijal Bankim Patel3

  • 1Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

Nano Letters
|January 19, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new nanoporous polymer matrix composite (PMC) for cost-effective daytime radiative cooling. This material offers efficient passive cooling for buildings, combating global warming and reducing energy use.

Keywords:
3D printingnanoporous polyethylenepolymer matrix compositeradiative coolingthermal management

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sustainable Energy

Background:

  • Daytime radiative cooling offers a passive strategy for building cooling by reflecting sunlight and emitting heat into space.
  • Current radiative cooling technologies face limitations due to high costs and complex manufacturing processes.
  • Advancements in novel materials have shown promising subambient cooling under direct sunlight.

Purpose of the Study:

  • To develop a cost-effective and rapidly producible material for daytime radiative cooling.
  • To overcome the limitations of current radiative cooling technologies for large-scale building applications.
  • To demonstrate the potential of nanoporous polymer matrix composites (PMCs) for energy saving and emission reduction.

Main Methods:

  • Fabrication of a nanoporous polymer matrix composite (PMC) using scalable polymer processing techniques.
  • Characterization of the PMC's optical properties, including solar reflectance and infrared emissivity.
  • Evaluation of the PMC's cooling performance under direct sunlight, measuring temperature drop and cooling power.

Main Results:

  • The developed nanoporous PMC exhibits high solar reflectance (96.2%) and infrared emissivity (>90%).
  • Achieved a subambient temperature drop of 6.1 °C under direct sunlight.
  • Demonstrated a cooling power of 85 W/m² under direct sunlight, comparable to state-of-the-art materials.

Conclusions:

  • The nanoporous PMC enables rapid production and cost reduction for radiative cooling applications.
  • The material's performance is competitive with existing advanced radiative cooling technologies.
  • This work paves the way for more accessible and viable radiative cooling solutions in buildings to save energy and reduce emissions.