Accelerating vapor condensation with daytime radiative cooling

摘要

Vapor condensation plays a crucial role in solar water-purification technologies. Conventional condensers in solar waterpurificationsystems do not provide sufficient cooling power for vapor condensation, limiting the water production rate to0.4 L m-2 hour-1. On the other hand, radiative dew condensation, a technique used by existing radiative dew condensers,only works at nighttime and is incompatible with solar water-purification technologies. Here, we develop daytime radiativecondensers that reflect almost all solar radiation, and can thus create dew water even in direct sunlight. Compared to stateof-art condensers, our daytime radiative condenser doubles the production of purified water over a 24-hour period.