Editing Ocean thermal energy conversion (section)

=== Working fluids ===
A popular choice of working fluid is ammonia, which has superior transport properties, easy availability, and low cost. Ammonia, however, is toxic and flammable. Fluorinated carbons such as [[Chlorofluorocarbon|CFC]]s and [[HCFC]]s are not toxic or flammable, but they contribute to ozone layer depletion. [[Hydrocarbon]]s too are good candidates, but they are highly flammable; in addition, this would create competition for use of them directly as fuels. The power plant size is dependent upon the vapor pressure of the working fluid. With increasing vapor pressure, the size of the turbine and heat exchangers decreases while the wall thickness of the pipe and heat exchangers increase to endure high pressure especially on the evaporator side.