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Zero-energy cooling chamber

A cooling chamber can lengthen sufficient crop quality after harvest by two weeks. This zero-energy cooling chamber is a low-tech and low-cost method to achieve this. A whole in the soil is excavated (by hand), and its walls are lined with bricks and mortar. Keeping the bricks wet is the only maintenance that is needed to keep the technology running. It uses evaporation to cool the inner space, that can be used as storage space.