Water evaporation- condensation
Thanks to the nearly stable temperature of the water throughout the day, and the thermal excursion occurring inside the biosphere between night and dau, the seawater inside the biosphere can evaporate and condense on the internal surfaces of biosphere (cooler than the air). In this way fresh water is formed and it can be used for the growth of the plants, making Nemo's Garden a self-sustainable system.
The water evaporation-condensation is monitored in terms of Relative Humidity percentage (RH%) inside the biosphere. Usually plants need 70-75 RH% in standard conditions of growth. Generally speaking, RH% in the biosphere is very high: values up to 97% RH% have been recorded overnight during the day, RH% decreased till 85 % minimum.
Due to the high content of humidity, a large amount of fresh water is collected on the biosphere surfaces. This fresh water, once collected, can finally canalized inside the hydroponic system. Minerals are added to the fresh water collected which, after the evaporation-condensation process, does not contain any minerals.
Analyses performed on fresh water formed during evaporation demonstrates that it has physical-chemical and organoleptic characteristics in agreement with those required by the Italian legislation to a typical water employed for irrigation.