The Cold Pot a terracotta pot by Zurich-based designer Thibault Faverie, based on evaporation, naturally lowers air temperature.
The very simple system of Cold Pot is based on ‘bio air-conditioning’. The porous terracotta surface acts as a heat exchange, absorbing water from the inside and sends it to the outer surface.
On contact with air water evaporates.The process cools the object and the inner aluminum pipe where air circulates.
The Cold Pot is low-maintenance and requires only two liters of water.
The system works as the Zeer the Electricity-free Refrigerator.
source Cold Pot