What is OTEC?
There is a temperature difference of between 20 and 25 in the ocean, between warm surface seawater and cold deep seawater. Figure 1 shows vertical temperature profiles of seawater. The temperature of surface seawater in the tropical and the subtropical seas are between 20 to 30, while seawater at the depth at 800 - 1,000m remains between 4 - 6. OTEC is feasible from temperature difference of 15 between warm surface seawater and cold deep seawater with little impact on the surrounding environment.

Fig. 1
Vertical temperature distribution of seawater

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