| 摘要 |
A method and apparatus is described for the multi-effect distillation of water using incident solar energy wherein thermal gradients, established along the length of the still, induce the heat of water condensation to be recuperated to aid feedstock water evaporation. A fan induces air to flow through the still in a closed loop path through transparent plastic film ducts. Air passing through the lower air duct, progressively warms and evaporates feedstock water from the floor of the still. At the hot end of the duct, the airstream passes through an opening into the upper air duct where it passes down the length of the upper air duct in reverses direction, progressively cooling and condensing its vapor on the walls of the still. The heat of condensation conducts to the lower air duct by passing through the light-transmitting plastic film barrier that separates the two air ducts.
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