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All-day passive radiative cooling using common salts.

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New radiative cooling panels made from abundant salts effectively reduce heat gain. This affordable, electricity-free technology offers improved cooling performance for practical applications.

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Area of Science:

  • Materials Science
  • Thermodynamics
  • Nanotechnology

Background:

  • Radiative cooling materials are limited by parasitic heating from ambient air.
  • Existing solutions for parasitic heating can be costly or complex.
  • Naturally abundant salts offer potential for improved cooling materials.

Purpose of the Study:

  • To develop an inexpensive and easily fabricated material to enhance radiative cooling performance.
  • To mitigate parasitic heating in radiative cooling applications.
  • To create a practical, electricity-free cooling technology.

Main Methods:

  • Fabrication of aerogel-like foam structures using NaCl and KCl salts.
  • Incorporation of anti-caking agents to stabilize nanostructures against moisture.
  • Packaging of salt foams into mechanical supporting panels.
  • Testing of cooling performance and parasitic heating reduction over a 24-hour cycle.

Main Results:

  • The salt foam panels effectively scattered visible light and transmitted infrared radiation.
  • Parasitic heating was reduced by over 50% compared to uncovered surfaces.
  • Underlying surfaces were maintained below ambient temperature for 24 hours.
  • Cooling was achieved even for highly absorbing surfaces.

Conclusions:

  • The developed salt foam panels represent an affordable and scalable radiative cooling technology.
  • This material effectively reduces parasitic heating, enhancing cooling efficiency.
  • The electricity-free, easily produced panels have significant potential for widespread practical application.