Ocean Thermal Energy Conversion.pptx Neelu Otec a6n2y

OCEAN THERMAL ENERGY CONVERSION (OTEC) Presented by SUMAN RAJ Roll no:13EAREE753 Guided by Mr. PRATEEK BHARDWAJ

INTRODUCTION:  OTEC, ocean thermal energy conversion is an energy technology that converts solar radiation into electric power.  The oceans cover a little more than 70 % of the earth surface .  This makes it the world’s largest solar energy collector and energy storage system .

HISTORY OF OTEC :  In 1881 ,Jacques Arsene d’Arsonval a French physicist has proposed tapping thermal energy from ocean.  In the year 1930 his student named Georges Claude built OTEC plant in Matanzas , Cuba which generates 22kw of power.

TYPES OF OTEC POWER PLANT :

LAND BASED

FLOATING BASED

WORKING PRINCIPLES OF OTEC  OTEC systems use the ocean’s natural thermal gradient, consequently the temperature difference between the warm surface water and the cold deep water below 600 meters by about 20 °C, an OTEC system can produce a significant amount of power.

TYPES OF OTEC CYCLE : Open cycle  The thermal working fluid used is the sea water.  The warm surface water at around 27 ºC, is evaporated at low pressure slightly below the saturation pressure.  After expanding in the turbine to drive the generator, the steam turns into liquid again by the exposure to a cold deep water (5 ºC) condenser .  Finally, it is returned to the sea.

OPEN CYCLE :

Closed cycle  These type of cycles use ammonia, propane, freon, etc. as thermal working fluid .  The liquid fluid is pumped through the evaporator, where it is vaporized by the warm surface water at 27 ºC. After that, it is expanded in the turbine (driving the generator) and then the cold deep water at 5 ºC condenses it back to a liquid, closing the cycle

CLOSED CYCLE:

Hybrid cycle These cycles produce both electricity, with a closed cycle system, and fresh water, by the desalinization with an open cycle system.

APPLICATIONS :  Ocean thermal energy conversion (OTEC) systems have many applications or uses.  It is a base load power generation.  generate electricity  desalinate water  deep-water mariculture and food  provide refrigeration and  air-conditioning as well as aid in crop growth and mineral extraction.

ADVANTAGE & DISADVANTAGE ; ADVANTAGE

DISADVANTAGE

 OTEC-produced electricity at  OTEC uses clean, renewable, cost more than electricity natural resources. generated from fossil fuels at  OTEC systems can produce their current costs. fresh water as well as electricity.  OTEC plants must be located  Suitably designed OTEC plants on equatorial and tropical will produce little or no carbon zone. dioxide.  Construction of OTEC plants  The use of OTEC as a source of and lying of pipes in coastal electricity will help reduce the waters may cause localised state's almost complete damage to reefs and neardependence on imported fossil shore marine ecosystems. fuels.

FUTURE PROSPECT :  One of the critical problem of the next centuary will certainly be “global warming” .  OTEC is unique among all energy generated technologies .  OTEC involves bringing up mineral rich water from depth of ocean in future.

CONCLUSION :  OTEC has a tremendous potential to supply the world’s energy.  OTEC, Ocean Thermal Energy Conversion is an energy technology that converts solar radiation to electric power. OTEC systems use the ocean’s natural thermal gradient.  The OTEC process consist of pumping cold ocean water to the surface and using the temperature difference between this and the warm surface water to run a thermal engine to generate electricity.

REFERENCE  S.HASAN SAEED & D.K.SHARMA ,non –conventional energy resources  G.D. RAI , Non Conventional Source of Energy  B.H.KHAN , Non Conventional Source of Energy .  www.studentmafia.org

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