Researchers in Saudi Arabia have field-tested a solar panel cooling system which uses an atmospheric water harvester, gathering water from air humidity during the evening and night, and allowing it to evaporate during the day. This sorption-based device, which has been in the works since 2017, is simple from an engineering perspective and could be retrofitted to existing installations. The results of the field test were a 19% improvement in generation in summer and 13% in winter, though the 19% figure was likely helped by good winds. In laboratory conditions, a cooling of more than 10 °C was seen, with cooling power of 295 Watts per square meter, off a solar irradiation of 1000 Watts per square meter. The cooling…