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(C) Ocean Thermal Energy Conversion $(OTEC)$ systems utilize the temperature difference between the warm surface water of the ocean and the cold deep-

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(C) Ocean Thermal Energy Conversion $(OTEC)$ systems utilize the temperature difference between the warm surface water of the ocean and the cold deep-sea water.For the efficient operation of an $OTEC$ power plant,a temperature difference of at least $20^{\circ} C$ between the surface water and the water at depths up to $1000 \,m$ is required.This temperature gradient allows the system to drive a heat engine to produce electricity.

The temperature difference required up to a water level difference of $1000 \,m$ for operating an Ocean Thermal Energy Conversion $(OTEC)$ system is: (in $^{\circ} C$)

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