1) A "solar still" is not an energy store, its driving force is the energy flow between the warm zone and the cold zone. Nevertheless, cooling is missing in most constructions.
2) As a rule, a wind generator is also missing, which moves the steam from the warm zone to the cold zone. Despite the low temperature, a large amount of water evaporates from the ocean because the wind is constantly blowing.
As the volume of piled water grows, there is a greater chance that the water's temperature will rise, enhancing the rate at which the top layer of basin water evaporates. Although wick materials may have a high rate of evaporation and a good capillary action to absorb saline water, their terrible odor and turbidity raise operational and maintenance costs. Due to salt being trapped in the sponge's pores, fresh water production was reduced when sponge materials were used. It is determined that by adding sensible heat storage materials like salt or/and molten salt, enclosed in cuboid boxes, the surface area of water in the solar still can be increased.
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