Nyit 2 June 2011 Presentation Wave Energy Conversion Potential Off Ny Nj M Raftery

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This slide deck cover recent developments in wave energy conversion for mild to moderate wave climates

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Nyit 2 June 2011 Presentation Wave Energy Conversion Potential Off Ny Nj M Raftery

  1. 1. Wave Energy Conversion Potential off New York and New JerseyPresenter: Michael Raftery, M.E.Research EngineerStevens Institute of TechnologyOffice: +1 201 216 8704Testing and Research Funded byThe Office of Naval Research
  2. 2. Agenda• Wave Energy Conversion Challenges• Developing Solutions• Wave Tuning Research Results• Wave Energy Harnessing Device• Power Take-Off System• Northeast Wave Energy Region• Performance Projections 1:10 Scale to Prototype• Load Control-Energy Storage• Southern New Jersey• Business Case Executive Summary
  3. 3. Wave Energy Conversion Challenges• Mild wave slopes do not provide sufficient acceleration of power take-off components for existing systems to operate efficiently• Buoyancy and stability related catastrophic failures have occurred during prototype deployments• Power take-off and electricity generation are strongly coupled in existing systems• Storm events result in extreme structural loads in all wave climates
  4. 4. Developing Solutions• Capable of tuning waves and concentrating wave power• Capable of eliminating single-point, buoyancy and stability related failures• Capable of decoupling power take-off from electricity generation with energy storage• Capable of avoiding extreme anchor loads during storms
  5. 5. Wave Tuning Research• A variable-depth, fully-submerged tension leg platform (TLP) was tested in the wave tank facility at Stevens to quantify the wave tuning capabilities of the TLP. The test matrix was scaled at 1:10 based on average waves off NJ/NY/NE
  6. 6. Wave Tuning ResearchTLP Shoals10cm Wave overa 20cm BuoyBuoy MotionIncreases withWave Steepness
  7. 7. Mild Wave H =5.1cm (2in)
  8. 8. 5.1cm, 2.21s Wave – 15cm Platform DepthWave Heights:•Before Platform:•5.1cm (2.0 in) •Over Platform:•12.7 cm (5.0 in)•Wave Height Increase: 150%
  9. 9. Mild Wave ResultsH =0.051m (2.0in)Cg = 1.97 m/s at 1.98m tank depthE = 3.27 J/m^2P = 6.43 W/mTuned WaveH = 0.127m (5.0in)Cg = 1.14 m/s at 0.15m platform depthE = 20.25 J/m^2P = 23.07 W/m259% increase in power density
  10. 10. Moderate Wave H = 10.4cm (4in)
  11. 11. 10.4cm Wave – 15cm Platform DepthWave Heights:•Before Platform:•10.4 cm (4.1in) •Over Platform:•17.8 cm (7.0 in)•Increase in Wave Height: 71%•Note: waves dropped below the wave wire over the platform resulting in an apparent “flat” bottom
  12. 12. Moderate Wave ResultsH = 0.104m (4.1in)Cg = 1.97 m/s at 1.98m tank depthE = 13.58 J/m^2P = 26.74 W/mShoaled WaveH = 0.178m (7.0in)Cg = 1.14 m/s at 0.15m platform depthE = 39.78 J/m^2P = 45.32 W/m69% increase in power density
  13. 13. 1:10 Scale Model to Prototype 50m x 12m x 3m Barge 20m x 10m x 2.5m Floats
  14. 14. Wave Energy Harnessing Device (WEHD)
  15. 15. WEHD Sub-Systems
  16. 16. Power Take-Off System• 2 buoys = 800 cubic meters of displacement potential at still water line• Storage volume, 80 – 300L Accumulators• = 24m3 = 12m3 working volume• Storage pressure = 3000psi (200 bar)• Adiabatic Storage capacity = 303kWh (1.09GJ)
  17. 17. Northeast Wave Energy Region
  18. 18. 44017, 45m depth, 23NM offshore
  19. 19. 1m wave• Buoy lift: 410,000kg seawater• Lift rate: 1 m per 7 s• Acceleration: 9.8 m/s2• Input Lift Power: 574kW• Added Mass Lift Power: 287kW• 861kW * .35 efficiency = 301kW
  20. 20. 1m tuned wave• Buoy lift: 738,000kg• Lift rate: 1.8 m per 7 s• Acceleration: 9.8 m/s2• Input Lift Power: 1860kW• Added Mass Lift Power: 1116kW• 2790kW * .35 efficiency = 1042kW
  21. 21. 1.5m wave• Buoy lift: 615,000kg• Lift rate: 1.5 m per 7 s• Acceleration: 9.8 m/s2• Input Lift Power: 1292kW• Added Mass Lift Power: 646kW• 1938kW * .35 efficiency = 678kW
  22. 22. 1.5m tuned wave• Buoy lift: 820,000kg• Lift rate: 2.25 m per 7 s• Acceleration: 9.8 m/s2• Input Lift Power: 2583kW• Added Mass Lift Power: 1292kW• 3875kW * .35 efficiency = 1356kW
  23. 23. 7m wave• Buoy lift: 820,000kg• Lift rate: 7m per 10 s• Acceleration: 9.8 m/s2• Input lift Power: 5625kW• Added Mass Lift Power: 4219kW• 9844kW * .35 efficiency = 3445kW
  24. 24. 44008,66m depth, 54NM offshore
  25. 25. 12m wave• Buoy lift: 820,000kg• Lift rate: 12m per 12 s• Acceleration: 9.8 m/s2• Input lift Power: 8036kW• Added Mass Lift Power: 6027kW• 14063kW * .35 efficiency = 4922kW
  26. 26. 44025, 36m depth, 33NM offshore
  27. 27. Load Control-Energy Storage• 75kW for 4 hours• 150kW for 2 hours• 300kW for 1 hour (equilibrium-1m wave)• 600kW for 30 minutes• 1000kW for 18 min (equilibrium-1m tuned wave)• 1.2MW for 15 min (equilibrium-1.5m tuned)• 2.4MW for 7 min 30 s• 4.8MW for 3 min 45 s
  28. 28. Southern New Jersey• Southern New Jersey has three proposed offshore wind farms planned to land power cables in Atlantic City. The proposed “Backbone” seafloor power cable, planned to run from Manhattan, NY to Norfolk, VA with a branch into Atlantic City is currently designed to carry 5000MW of electric power, more than 5 times the output of all the planned wind farms. Wave energy can supplement Backbone capacity.
  29. 29. 44012, 19m depth, 57NM offshore
  30. 30. 44001, 63m depth, 57NM offshore
  31. 31. Business CaseDeploy 5GW (5000 MW) name plate capacity wave farm (1000 grid connected units) for under $5 billion. 5GW = 2.3x Output Capacity of Indian Point Nuclear Power PlantDemand a premium for “on demand, carbon free, grid quality electric power” at a rate of 0.8x utility’s residential rate.Produce a minimum annual average of 1GW (1000 MW) of grid quality electric power in the design wave climate ($1.05B/yr @ $0.12/kWh)
  32. 32. Contact InformationMichael Raftery, M.E.Research EngineerStevens Institute of TechnologyDavidson Marine Laboratory711 Hudson St.Hoboken, NJ 07030Email: michael.raftery@stevens.eduPhone: 201 216 8704Fax: 201 216 8214

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