Radiative sky cooling thermal concentration with cooling power exceeding one kW per square meter

Abstract

The world’s first demonstration of passive radiative cooling under the sun in 2014 attracted substantial attention due to its ubiquitous and passive nature. Numerous nanophotonic and metamaterials capable of radiative...

Both sub-ambient and above-ambient conditions: a comprehensive approach for the efficient use of radiative cooling

“…20 In general, broadband materials are preferred for above-ambient cooling conditions and selective materials are preferred for sub-ambient cooling conditions. However, real-world cooling objects are usually accompanied with internal heat sources or parasitic heat absorption, 21 such as power plant condensers, 22 telecommunication base stations, 23 and solar cells. 24,25 Therefore, a more complex cooling condition is the fluctuating temperature of a radiative cooling object between above-ambient and sub-ambient conditions due to intermittent heating fluxes such as daily/seasonal changes in solar intensity and periodic start-stops of internal heat generation devices.…”

Highly Potent Transparent Passive Cooling Coating via Microphase-Separated Hydrogel Combining Radiative and Evaporative Cooling

“…A combination of radiative and evaporative cooling is a judicious strategy for achieving effective cooling. − Though hygroscopic hydrogels can fulfill it, these reported materials are hardly always transparent. − The most popular method of radiative cooling is the combination of high emissivity with light blocking, , which will hinder the receipt of energy and/or the communication of information . In some important circumstances, where transparent cooling materials are required, high transmittance is a prerequisite.…”