Continuous humidity pump and atmospheric water harvesting inspired by tree pumping system. Entezari et al.

In this study, by mimic of transpiration of trees or plants, we proposed a humidity pump (HP) system using sorbents with an intense capillary effect that can sorb water molecules within the sorption site located indoor (roots) and transfer them to the outdoor (leaves), where they can be finally released through heating, thereby creating a continuous driving force for water wicking.

Meanwhile, we proposed and investigated the potential of the HP in hybridization with atmospheric water harvesting (AWH) systems for the first time (HP-AWH). We used low-cost ACF-LiCl composites for sorption since they have proven to possess high sorption capacity and strong capillary effect. The results indicate that if half of the surface of these composites is exposed to high humidity air, more than 50% of the sorbed water will be stored in the other covered half.