Most likely uses Ammonia as a working fluid
Warm surface water enters a boiler/evaporator that contains liquid ammonia
Liquid Ammonia boils and produces a vapor pressure of 9.3 atm
Vapor expands and drives turbine to produce electricity
Vapor then enters a condenser at a pressure of 6.1 atm
Ammonia condenses and liquid is pumped back into evaporator
Same as RANKINE cycle in steam engines, but different fluid and lower temps and pressure
Opposite of a commercial refrigerator
Any common refrigerant fluids (freons) can be used in OTEC
Thus, studies on refrigeration and cryogenic systems can be applicable to OTEC
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