ocean thermal engergy

1. Non-Conventional Energy
Sources
Ocean Thermal Energy
Conversion
(OTECH)

2. CONTENTS
• Introduction .
• Working principle.
• Method of generation.
• Power station in world.
• Problems of OTECH.

3. Introduction
• OTECH – concept – French Physicist Jacques
d’Arsonaval.
• Indirect form of solar energy at sea
• Surface of water – collector – solar - upper
layer – sea - infinite heat storage.
• Upper layer - heat, Deeper – cold.
• Warm surface water – use to heat – low boiling
organic fluids – then vapours use run heat
engine.

4. Working principle
• 2nd Law of Thermodynamic pre includes the
complete conversion of thermal energy into
electricity.
• OTECH uses – temp diff between – cooler deep
&warmer shallow – to run heat engine – produce
usefull work.
• OTECH – base load - Electricity Generation.

5. Contt…
Fig; 1 OTECH Process

6. Method of generation
• Method of harnessing – open cycle, closed
cycle
• Open cycle or Claude cycle
• Closed cycle or Rankine cycle.
Fig;1 OTECH Process

7. Rankine OTECH cycle
Fig; 2 Closed cycle or Rankine cycle

8. Rankine OTECH cycle
• Working fluid – Ammonia or Propane
• Working fluid – vaporous in evaporator by
absorbing heat – warm ocean surface.
• High pressure vapour – exit at the evaporator –
enters – Turbine – connected to Genarator.
• Expansion of vapour – in turbine generators –
Electric power.

9. Contt…
• At Turbine outlet – low pressure exhaust is
condensed to liquid by passing - condenser
• Cold and deep ocean water – use in condenser
to cool the working fluid.
• Then working fluid in liquid form is pumped
back into the evaporator.

10. OTECH Power Station in world
• IN 1930 – Georges Claude constructed plant at
Mantanzas Bay, Cuba. It is desined for 40 KW
but it produced 20 KW.
• In India 1MW OTECH plant established on
eastren side of Lakshadeep Island.
• Largest OTECH plant IN JAPAN – 16MW.

11. Problem associated with OTECH
• Losses are more, as OTECH requires power
for pumping up cold water.
• Extraction of energy is difficult and less
efficient.
• Costlier electric power than any other
resources