Botijo

The operating principle of the botijo, or any earthenware water jar, is as follows: the stored water is filtered through the pores of the clay and in contact with the outside dry environment (characteristic of Mediterranean climate), it evaporates, producing a cooling (2.219 kilojoules per gram of evaporated water). The key for cooling it, is by the evaporation of bleed water, as the water evaporates, it extracts thermal energy from the water stored inside the jug. ...because of the porous nature of the clay jar, which is unglazed, the water within will slowly seep out through the pores, and the warm air outside causes evaporation. This circulation and evaporation keeps the walls of the jar cool, and the water inside lowers in temperature, and becomes excellent for drinking. == Gallery ==