First, a turbine draws air underneath the ground into a network of pipes. When the air reaches condensation point the water pours down into a underwater tank. A submersible pump pumps the water back up through the central column of the piping and this is pumped through to the roots of plants through a process called sub-surface drip irrigation – which is the most efficient method of irrigating crops because you don't get evaporation.
What was the biggest design challenge you faced?
Creating enough condensation. We made a huge breakthrough by putting copper wool inside the pipes. The wool was cooled by the pipes and this increased the surface area within the pipes that was cool enough to cause condensation to take place.
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