| 摘要 |
A closed tunnel system for distilling fresh water from ocean salt water is provided with an elongated evaporation plate adapted to hold ocean water for evaporation therefrom. During the distillation process, a vacuum is drawn in the tunnel, and sunlight is focused onto the evaporation plate with a concave lens-structure roof. External concave mirrors automatically track the sun and focus additional sunlight onto the lens-structure roof. An agitator-wiper unit agitates the ocean water on the evaporation plate to maintain a homogeneous liquid mixture, and to present additional water surface area for evaporation of fresh water. The fresh water vapor then condenses under pressure in heat exchangers that simultaneously pre-heat the ocean water prior to entry onto the evaporation plate.
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