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Presentation transcript:

Submitted To: Submitted By: Seminar On Ocean Thermal Energy

Content Introduction To OTEC Achievements In OTEC Application Electricity production – Desalinate water – Refrigeration & air-conditioning – Mineral extraction Benefits Needed research References

Introduction to OTEC The oceans cover a little more than 70 percent of the Earth's surface. This makes them the world's largest solar energy collector and energy storage system. On an average day, 60 million square kilometers (23 million square miles) of tropical seas absorb an amount of solar radiation equal in heat content to about 250 billion barrels of oil.

Achievements In OTEC In 1881, Jacques Arsene d'Arsonval, a French physicist, was the first to propose tapping the thermal energy of the ocean. Georges Claude, a student of d'Arsonval's, built an experimental open-cycle OTEC system at Matanzas Bay, Cuba, in The system produced 22 kilowatts (kW) of electricity by using a low-pressure turbine. In 1935, Claude constructed another open-cycle plant, this time aboard a 10,000-ton cargo vessel moored off the coast of Brazil.

Achievements In OTEC…

Applications Ocean thermal energy conversion (OTEC) systems have many applications or uses. OTEC can be used to generate electricity, desalinate water, support deep-water maricultu re, and provide refrigeration and air-conditioning as well as aid in crop growth and mineral extraction.

Electricity Production Two basic OTEC system designs have been demonstrated to generate electricity: closed cycle and open cycle.

Closed-Cycle OTEC System In the closed-cycle OTEC system, warm seawater vaporizes a working fluid, such as ammonia, flowing through a heat exchanger (evaporator).

Open-Cycle OTEC System In an open-cycle OTEC system, warm seawater is the working fluid. The warm seawater is "flash"-evaporated in a vacuum chamber to produce steam at an absolute pressure of about 2.4 kilopascals (kPa).

Hybrid OTEC System A hybrid cycle combines the features of both the closed-cycle and open- cycle systems. In a hybrid OTEC system, warm seawater enters a vacuum chamber where it is flash-evaporated into steam, which is similar to the open-cycle evaporation process.

Desalinated Water Desalinated water can be produced in open- or hybrid-cycle plants using surface condensers. In a surface condenser, the spent steam is condensed by indirect contact with the cold seawater. Refrigeration and Air-Conditioning Mineral Extraction

Benefits of OTEC Helps produce fuels such as hydrogen, ammonia, and methanol. Produces base load electrical energy. Produces desalinated water for industrial, agricultural, and residential uses. Is a resource for on-shore and near-shore mariculture operations. Provides air-conditioning for buildings. Provides moderate-temperature refrigeration.

Needed Research Obtain data on OTEC plant operation with appropriately sized demonstration plants. Conduct further research on the heat exchanger systems to improve heat transfer performance and decrease costs. Conduct research in the areas of innovative turbine concepts for the large machines required for open-cycle systems. Identify and evaluate advanced concepts for ocean thermal energy extraction.

References

Thanks