NOVELTY - The ocean thermal energy conversion system comprises a first sub-system to be disposed at a surface of the ocean, a second sub-system to be disposed at an ocean depth (500 meters), and a turbine (240) coupled between the first and second sub-systems. The first sub-system includes an evaporation unit (210). The evaporation unit is configured to vaporize a working fluid comprising seawater to produce water vapor, and comprises inlet (212) and outlet (214) for flowing seawater through a first heat exchange unit, and an evaporator (250) in thermal communication with seawater.    USE - The ocean thermal energy conversion system is useful for producing desalinating water and for generating electricity.    ADVANTAGE - The system ensures reliable and stable conversion of ocean thermal energy, and can able to easily pump a same volume of vapor to the ocean depths than seawater with less consumption of energy and without any negative impacts.    DETAILED DESCRIPTION - The ocean thermal energy conversion system comprises a first sub-system to be disposed at a surface of the ocean, a second sub-system to be disposed at an ocean depth (500 meters), and a turbine (240) coupled between the first and second sub-systems. The first sub-system includes an evaporation unit (210). The evaporation unit is configured to vaporize a working fluid comprising seawater to produce water vapor, and comprises inlet (212) and outlet (214) for flowing seawater through a first heat exchange unit, and an evaporator (250) in thermal communication with seawater flowing through the first heat exchange unit and evaporation unit. The second sub-system is configured to condense the water vapor to produce desalinated water, and comprises a pipe to condense the vaporized working fluid. The turbine is incorporated in the first sub-system, the second sub-system or between the first and second sub-systems. The evaporator comprises an evaporator input port for receiving seawater, and first and second evaporator output ports. The first evaporator output port is coupled to the turbine and the second evaporator output port is present in communication with the ocean. The water vapor passes to the turbine through the first evaporator output port and unvaporized seawater returns to the ocean through the second evaporator output port. INDEPENDENT CLAIMS are included for:    (1) a method for converting energy from the ocean; and    (2) a method for desalinating seawater.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an ocean thermal energy conversion system.    Evaporation unit (210)    Inlet (212)    Outlet (214)    Turbine (240)    Evaporator. (250)