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Evaporative cooling and desalination
Last night at the yacht club, the Sea Scouts gave a demo on a homemade
water still where they put a can of salt water into a clear plastic bag. Evaporation then condensed on the plastic and flowed to the bottom as fresh water. Now, Evaporation goes much faster as temp goes up and with surface area. So, I propose a simple inflatable Compound Parabolic Concentrator (google it) type optic with a container at the area of maximum solar flux. This container would be permeable so that salt water could wick through it and be evaporated and then run down the plastic to the bottom. This might even be more useful than commercial RO devices. Once I saw a water container in St Augustine made by the Spanish in the 1600s from permeable coral. They put water into it and water wicked through it and evaporated causing the water inside to become cooler. I could not ascertain its effectiveness because the museum had it in the shade out of the wind too.. Perhaps one could make something like this from modern lightweight materials. |
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