New radiative cooling technology promises breakthrough for vertical surfaces

A study ^[1] published in Science on November 14, 2024, by Fei Xie and his research team introduces an innovative radiative cooling technology designed for vertical surfaces. Unlike traditional materials, which are effective only on horizontal surfaces, this new technology allows cooling of walls, vehicles, and textiles by emitting thermal radiation into space, achieving a temperature reduction of 2.5°C below ambient even under direct sunlight. 

 

The design features an angularly asymmetric, spectrally selective emitter that prevents heat absorption from the ground, a common issue with vertical surfaces. This breakthrough enables better performance compared to conventional coolers and even commercial white paint, achieving a significant temperature drop. 

 

This technology could have implications for reducing energy use in air conditioning and combating the urban heat island effect. By tailoring the material’s infrared properties to different environmental conditions, the team believes this technology could play a key role in mitigating climate change. 

 

Source 

[1] Xie, F., Jin, W., Nolen, J. R., et al. (2024). Subambient daytime radiative cooling of vertical surfaces. Science. DOI: 10.1126/science.adn2524