Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 206, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2019.110319
Keywords
Radiative cooling; Solar filter; Passive cooling; LWIR transparent
Funding
- Advanced Research Projects Agency -Energy, U.S,. Department of Energy [DE-AR0000576]
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Passive radiative daytime cooling is a low-cost solution to improve human comfort and reduce the energy demands of cooling on a global scale. We present the first demonstration of direct full-sun daytime radiative cooling using an all-polymer filter that blocks solar irradiance while maintaining high transmittance in the long-wave infrared (LWIR). Warm objects and surfaces radiatively transfer heat through the polymer solar filter to the cold sink of space, decreasing temperatures up to 10 degrees C during day and night. The polyethylene (PE) filter exploits scattering by size-controlled air pores to maximize reflection of solar photons, while preserving the LWIR transparency inherent to PE. We demonstrated cooling power of over 110 W/m(2) for an emissive surface placed beneath the solar filter. Scalable, low-cost manufacturing of a radiative cooling polymer solar filter allows direct full-sun daytime cooling of heat-emitting surfaces in a variety of settings.
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