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Ocean Mechanical Thermal Energy Conversion

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https://www.eia.gov/energyexplained/hydropower/ocean-thermal-energy-conversion.php

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Ocean Thermal Energy Conversion systems use a temperature difference to power a turbine to make electricity. Surface water is pumped through an evaporator containing a working fluid. The melted fluid drives a generator. The melted fluid is turned back into a liquid in a condenser cooled with cold ocean water pumped from the ocean. OTEC systems using seawater as the working fluid can use the condensed water to produce desalinated water.

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Energy from the sun heats the surface water from the ocean. In tropical regions, surface water can be a lot warmer than deeper water. This difference can be used to produce electricity and to desalinate ocean water.

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Ocean Thermal Energy Conversion (OTEC) is a technology or process for producing energy by utilizing the temperature differences between ocean surface waters and deep ocean waters.