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OCEAN ENERGY

OCEAN THERMAL ENERGY CONVERSION

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Ocean Thermal Energy Conversion (OTEC) technology

OTEC technology is based on the difference in temperature between the warm surface water and the cold deep water of the ocean. A minimum thermal difference of 20°C is needed for the viable operation of an OTEC system.

The power system operates as a cyclic heat engine. Warm water passes through a heat exchanger to generate steam for driving the turbine. The steam is condensed into liquid with the cold water drawn from the ocean's depths.

An OTEC plant can be land-based, shelf-based or offshore.

The most common technology used in OTEC applications has been Rankine Cycle or Organic Rankine Cycle (ORC) which uses ammonia as the working fluid.

Because of the low temperature differential however, the size of the units are extremely large and costly relative to the economic benefit. Additionally, ammonia cannot be pre-pressurized to any great degree as it will liquefy, rendering the process inoperable.

With our technology, we can pre-pressurize to over 140 Bar, using helium or nitrogen as the working fluid. This allows a footprint up to 80% smaller with substantially reduced operational costs. The heat transfer rate and therefore the Kw per hour are exponentially increased.