A multi-stage power plant. The condenser side of the power plant runs the cold water in series through the stages. The boiler side runs the incoming warm water in parallel among the stages. Furthermore, it has a separate channel for using warm ocean water to drive a super heater for the boiled refrigerant vapor. Means are disclosed for producing large quantities of desalinated water by having the heat transferred from the warm ocean water to the boiler by evaporating and condensing water. Means also are disclosed for producing large quantities of desalinated water by having the heat transferred from the condenser to the cold ocean water by evaporating and condensing water.
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