NOVELTY - An energy conversion device comprises a temperature gradient existing inside a first chamber, with liquid and overlying vapor towards the turbine mouth end of the trough at a higher temperature than the far end of the trough, with a similar temperature gradient existing in the underlying second chamber, allowing thermal energy liberated by the condensation of the second vapor to be transferred to the first vapor, via the liquid in the trough, over a range temperatures, lower than the temperature at which the first vapor enters the turbine unit.    USE - The device is used for converting energy stored in warm water vapor into electricity, mechanical, or any other form of energy. Uses, for example, solar or geothermal energy sources.    ADVANTAGE - The device is more efficient than a conventional nuclear power station because it does not reject low-grade heat, simplifies the nuclear reactor design requirements, and reduces the manufacturing costs of the pressure vessel. It extends the working life of the fuel rods and reduces the nuclear waste storage costs. It reduces the costs and publicly perceived problems with designing a nuclear power plate, which is secure against earthquakes, terrorist, and other forms of hostile attack.    DETAILED DESCRIPTION - An energy conversion device comprises a turbine, a first supply of warm vapor originating from the evaporation of volatile liquid held in an extensive trough inside a first chamber, and a second supply of liquid vapor originating from the evaporation of a cooling liquid inside the body of the turbine unit. The first vapor is fed into the turbine. The second vapor condenses inside a second chamber placed underneath and in thermal contact with the first chamber. A temperature gradient exists inside the first chamber, with liquid and overlying vapor towards the turbine mouth end of the trough at a higher temperature than the far end of the trough, with a similar temperature gradient existing in the underlying second chamber, allowing thermal energy liberated by the condensation of the second vapor to be transferred to the first vapor, via the liquid in the trough, over a range temperatures, lower than the temperature at which the first vapor enters the turbine unit.    DESCRIPTION OF DRAWING(S) - The figures show a cross-section of turbo generator.    Stators (4, 5, 6, 7)    Chamber (7)    Solar radiation (9)    Inlet (10)