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PPT on OCEAN THERMAL ENERGY CONVERSION
Post: #1

OCEAN THERMAL ENERGY CONVERSION



.pptx  OCEAN THERMAL ENERGY.pptx (Size: 1.81 MB / Downloads: 121)

HISTORY OF OTEC

1881: Jacques Arsene d'Arsonval.
1930 :Georges Claude – open-cycle OTEC system at Matanzas Bay, Cuba.
The system produced 22 kilowatts (kW) of electricity .
Converts heat energy to Electricity.
It works good when Temperature of at least 20 Degree Celcious.
1979:18-kilowatt (KW) closed-cycle
OTEC in Hawaii.
Known as "Mini-OTEC," the plant was
mounted on a U.S. Navy barge moored approximately 2 kilometers off Keahole Point at Hawaii
The plant used a cold water.

CLOSED LOOP CYCLE

Closed-cycle systems uses working fluid.
Warm surface seawater is pumped through a heat exchanger.
The expanding vapor turns the turbo- generator.
Then cold deep seawater— pumped through a second heat exchanger.
condenses the vapor back into a liquid.
which is then recycled through the system.

OPEN LOOP CYCLE

It uses the warm sea water
Water placed in Low pressure container
Steam is driven in to the Turbine
Production of fresh water
The steam is condensed into liquid
Outs the Desalinated water & waste water

ADVANTAGES OF OTEC

Eco- friendly
Minimum maintenance costs compared to other power production plants
Provide air conditioning to buildings with the OTEC plant
Fresh water - first by-product is fresh water.
A small 1 MW OTEC is capable of producing some 4,500 cubic meters of fresh water per day.
Open cycle OTEC systems can produce desalinated water which is very important in third-world countries.
Chilled soil agriculture- cold seawater flowing through underground pipes, chills the surrounding soil.

CONCLUSION

Continuous production of Electricity & Fresh water has been demonstrated with this experimental plants.
OTEC is the most benign & less risky form of generating large amounts of energy presently available.
These technologies are renewable sources of energy.
Post: #2
The Ocean Thermal Energy Conversion (OTEC) uses the temperature difference between the cooler deep and shallowest surface seas of the refrigerator to run a heat engine and produce useful work, usually in the form of electricity. OTEC can operate with a very high capacity factor and therefore can operate in "base load" mode.

Among ocean energy sources, OTEC is one of the continuously available renewable energy resources that could contribute to the base power source. The resource potential for OTEC is considered much higher than for other forms of ocean energy [World Energy Council, 2000]. Up to 88,000 TWh / year of energy could be generated from OTEC without affecting the ocean's thermal structure.

Systems can be closed loop or open loop. The closed cycle OTEC uses working fluids that are often considered as refrigerants such as ammonia or R-134a. These fluids have low boiling points and are therefore suitable to feed the system generator to generate electricity. The most commonly used heat cycle for OTEC to date is the Rankine cycle, which uses a low pressure turbine. Open-cycle motors use seawater vapor as the working fluid.

OTEC can also supply quantities of cold water as a by-product. This can be used for air conditioning and refrigeration and deep ocean nutrient rich water can power biological technologies. Another by-product is the distilled fresh sea water.

The OTEC theory was first developed in the 1880s and the first bench size demonstration model was built in 1926. Currently the only operating OTEC plant in the world is in Japan, overseen by Saga University.
 

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