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otec.pptx

  1. 1. Arunamaheswari C Assistant Professor KCG College of Technology
  2. 2. Introduction ⚫The ocean cover 70% of the earth surface means ocean is the world largest solar energy collector & energy stored system. ⚫So, it possible to generate electricity from the oceanic thermal energy?
  3. 3. What is OTEC..??? (Ocean thermal energy conversion) ⚫JacquesArsene d’Arsonval (1881) ⚫Energy convert –ocean solar radiation to electric power ⚫Renewable energy(clean & green power) ⚫Hydro energy thermal conversion system ⚫Use temp. differences
  4. 4. How does it work..??? ⚫Fuel of OTEC.. ⚫25-4 degree c (20 degree c differences) ⚫Used to drive steam cycle that turn to turbine ⚫Part of OTEC ⚫Require large volume ⚫Ex-100MW 20,000,000 gallon water ⚫Pump use 30% electricity
  5. 5. Type of OTEC- 1) Closed Cycle OTEC 2) Open Cycle OTEC 3) Hybrid Cycle OTEC
  6. 6. 1) Closed Cycle OTEC ⚫Warm & cold water ⚫Ammonia as working fluid ⚫Generate electricity not fresh water
  7. 7. 2) Open Cycle OTEC ⚫Seawater is working fluid ⚫Vacuum ⚫0.3 psia –22 degree c (boiling point of water) ⚫Boiling water drive to turbine ⚫Give Production of electricity & fresh water
  8. 8. Close Cycle Open Cycle
  9. 9. ⚫Combination of Closed & Open Cycle 3) Hybrid Cycle OTEC
  10. 10. Platforms of OTEC 1) Land Based Power plant
  11. 11. 2) Sea Based Power plant(Floating plant)
  12. 12. Potential of OTEC ⚫98 nations have been identified OTEC potential zone ⚫More potential for tropical countries(20-25 degree c)
  13. 13. Infrastructure & Cost ⚫Size-100MW…10mt pipe diameter ⚫Length required >1000 mt ⚫Big construction of plant ⚫Required skill & experiment 10MW(Landbased) coast- 40,000,000 10MW profit per/yr-10,000,000 100MW coast-215,000,000 profit-100,000,000 (Source-www.oteci.com/http://nelha.hawaii.gov/)
  14. 14. OTEC Products (Outputs) ⚫1) Electricity ⚫2) Fresh water ⚫3) SWAC ⚫4) Mari culture
  15. 15. 1) Electricity ⚫Able to provide continuously electricity ⚫Energy losses 20%-30% 2) Fresh water ⚫100MW -33,000,000 cubic mt per yr
  16. 16. 3) Mari-culture (fish production) ⚫Concentration of minerals, nutrients ⚫Artificial pond ⚫Very large profit 4) SWAC (Sea Water Air condition) ⚫SWAC require 1 cold pipe to reduce temp. ⚫Resort, Hotels, Hospitals, malls…. ⚫ Reduce electricity uses 80%-90% (AC)
  17. 17. OTEC Plant in World Installed- ⚫Hawaii 1 MW -OTEC International and NELHA ⚫Japan/Nauru 120 kW- Japan Institute for Ocean Energy Research ⚫South Korea 20 kW- Installed in 2013. KISOT ⚫Japan/Okinawa 50 kW- XenesysIncorporated, IHI,and Yokogawa Developing Stage- ⚫Hawaii 10 MW- Lockheed Martin Naval Facility Engineering Command ⚫Southern China 10 MW- Lockheed Martin, Reign wood Group (India-Tuticorin 1 MW -Ammonia-based closed cycle, started in 2000, but not completed due to problems with the pipes for pumping the seawater;floating plant.(IIT))
  18. 18. Advantages ⚫Use clean, renewable, natural resource ⚫“0” Carbon emission (sometime little) ⚫Produce electricity as well as fresh water ⚫Reduce dependency on fossil fuel (1.3million barrel p/ye) ⚫Produce 120,000,000 litter fresh water p/day(100MW) ⚫Mariculture -70 tons of shellfish meat grow each day(100MW) (Johnson 2013)
  19. 19. Disadvantages/Limitations ⚫OTEC produced electricityat present some timecost more than electricity ⚫OTEC plant not working further 40 degree latitude ⚫The pipe used in OTEC nearly up to 10 mtdiameter, there is animal aresucked into the OTEC system. ⚫Risk of the leakageof Ammonia ⚫Cold waterdischargeon surface water itdangerous for marine lifeex- Coral reefs ⚫OTEC –Experimental Stage
  20. 20. Ocean Thermal Energy Conversion (OTEC) is a technology solution that directly addresses the key concerns of energy security, global warming, pollution and depletion of nonrenewable fossil resources. OTEC provides a clean, reliable energy solution for many areas of the world.
  21. 21. Thank You

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