The afternoon heat causes the humidity in the greenhouse to evaporate and rise. During the night, the top of the greenhouse opens and exposes the collected drops to cold air, causing them to condense and fall back as dew. Where they fall is neither more nor less than in a cistern that stores them. Then that stored water is used to irrigate the same plants. Excess moisture is retained for future use.
In this way, the process can be repeated daily and the plants will grow with the necessary vitality to yield their products.
Seen at Fundación Irradia