This is a no power fridge that is made of clay. Although the fridge is only good for short-term storage, it keeps the original taste of fruits and vegetables for up to five days. It is even claimed that it can store milk for up to three days. It’s not a long time but couild be a great idea for off the grid living.
To learn more about this concept please folllow the link below…
Refrigerator Made Out of Clay Does Not Require Energy to Cool Food
The concept is old, like in a water clay pot, water vapor escaping through the clay acts as a heat sink allowing the interior of the container to stay cool. I don’t know if there are other technicalities that I am missing, but I have read about this concept being used in old clay houses.