Studiomobile, an Italian architectural firm, have been working during the last couple of years in the United Arab Emirates and their most recent development is the concept seawater vertical farm. Their design, the Seawater Vertical farm utilizes seawater to keep cool and moisten greenhouses and to transform enough humidity back in to water to irrigate the plants. This project would be very much helpful where the supply of fresh water is limited and not much local cultivations are taking part. This project is very expensive but has been considered feasible because of the urban transport problem and the high soil value.
How the concept works :
The air going into the greenhouse is first cooled and humidified by seawater, which is trickled over the first evaporator. This provides a fresh and humid climate for the crops that in these conditions need very little water as they are not stressed by excessive transpiration.
As the air leaves the growing area it passes through the second evaporator which has seawater flowing over it. During this phase the humid air mix with the warm dry air of the ceiling interspace. thus the air is made much hotter and more humid.
The warm air is forced to flow upward by the stack effect that is temperature induced. In the central chimney the warm and humid air will condense when in contact with plastic tubes where cool sea water is pumped. In the surface of the condenser many drops of fresh water will appear, ready to be recollected in a tank to water the crops and for other uses.