How it works?
Cold Box is made of two cylinders one inside the other.
Inner cylinder has no holes to ensure contents remain dry.
The gap between the innter and outer cylinder is filled with a metarial such as sand, wool or soil, that can be soaked with water.
In hot weather the sun's rays heats this wet metarial and the water evaporates off. As the metarial is held against the inner cylinder wall, heat is removed from innter chamber by the evaporation precess, keeping it at a tempature of a cool.
Inspired by Emily Cummins' solar-powered fridge invention.
| Cold_Box.STL | 4.2MB | |
| Cold_Cover.STL | 505.4KB |
