Cold Box with Green Energy

thingiverse

Cold Box works as follows: Two cylinders are stacked together, one within the other, making up Cold Box's core structure. The inner cylinder remains devoid of any holes, thereby guaranteeing that its contents stay dry. The narrow space between the outer and inner cylinder is packed with a material like sand, wool, or soil. These materials can be easily saturated with water. When sunlight shines down on the wet material in warm weather, evaporation begins to take place as the heat is absorbed. As this material remains firmly pressed against the interior wall of the inner cylinder, it causes the evaporation process to cool down the space within by a significant amount, thus maintaining its temperature at a remarkably low level. Inspiration for Cold Box came from Emily Cummins' solar-powered fridge design.