Ocean Energy :: Tony Bilello

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Ocean Energy Tony Bilello
It is estimated that if 0.2 of the oceans
untapped energy could be harnessed, it could
provide power sufficient for the entire world.
(www.nrel.gov)
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Global Wave power distribution
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• Wave crest ?wave front?Peak

• http//homepages.cae.wisc.edu/vining/JVining_IAS0
  6_WaveEnergySurvey.pdf

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http//hays.outcrop.org/images/shorelines/press4e/
figure-17-13-1.jpg
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• how wave period and amplitude affect wave power
  density and power per wave front.

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• Win96.0_MW/m
• Sum13.2_MW/m

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• Ocean energy comes in a variety of forms such as
  marine currents, tidal currents, geothermal
  vents, and waves. All are concentrated forms of
  solar or gravitational energy to some extent.
  Moreover, wave energy provides 15-20 times more
  available energy per square meter than either
  wind or solar. The most commercially viable
  resources studied so far are ocean currents and
  waves.

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• Marine currents in pic like gulf stream heat at
  eq10yr cycles
• Tidal currents-gtMoon, gravitational forces
  attract water, semi-diurnal (Pac), daily-diurnal
  (Atlantic), and also 14day cycles full moon, new
  moon
• Tidal currents are directional by tides into hi
  T, out to low T, unlike marine currents

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Types of Wave Energy Extraction Devices

• Shoreline devices Oscillating Water Columns
  (OWC), tidal fence.
• Near shore devices Mighty Whale floating OWC,
  Pelamis, Ocean Power Delivery System (OPD)
• Off shore devices bouy generators

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The OWC Type Limpet 500 of Islay will feed 500
Kilowatts of electricity into Islands grid.
OPD- Pelamis
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• Jiangxia power station is the largest tidal power
  station in China and the third largest tidal
  power station in the world, which has been put
  into operation for nearly 20 yearsThe project
  investment was 1,130 million Yuan. It has started
  the construction from 1974. The first generator
  sets of 500kW started its generation in1980.

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Tidal Fence
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Tidal fences are composed of individual, vertical
axis turbines which are mounted within the fence
structure, known as a caisson, and they can be
thought of as giant turn styles which completely
block a channel, forcing all of the water through
them
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Over Topping WEC
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Limpet 500
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• The Pelamis is unique among wave energy
  converters. Although it also employs the use of a
  hydraulic system, it is not driven by the up and
  down motion of a float. The Pelamis, with its
  linked chain of cylindrical sections, looks like
  a snake floating on the ocean surface. The
  cylindrical sections are held together by hinged
  joints whose heave and sway motion pumps high
  pressure hydraulic oil. The mooring system allows
  the Pelamis to retain its position but is
  flexible enough to swing head-on into oncoming
  waves

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• Tue 20 Feb 2007
• Pelamis wave energy converters. There are hopes
  that sea could potentially provide three times
  the UK's power needs. Picture Stephen Mansfield
• Wave farm points way ahead for Scotland
• IAN JOHNSTON ENVIRONMENT CORRESPONDENT
  (ijohnston_at_scotsman.com)
• World's biggest wave farm to be built off coast
  of Orkney in 2008
• Potential for Scotland to become world leader in
  field
• Executive target is 18 of energy from renewable
  sources by 2010

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Tidal/Wave Enregy

• Archimedes Wave Swing

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• OSUs Bouy block diagram

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• The utilization factor for wave power the
  ratio of yearly energy production to the
  installed power of the equipment is typically 2
  times higher than that of wind power. That is
  whereas for example a wind power plant only
  delivers energy corresponding to full power
  during 25 of the time (i.e. 2,190 h out of the
  8,760 h per year) a wave power plant is expected
  to deliver 50 (4,380 h/year). Interesting?
• Source Bringing Ocean Power to the World,
  Seabased Energy AB, http//www.seabased.com,
  (current 1 Dec. 2005).

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Sustainable Energy Alternativesdiversify your
portfolio and be prepared for the uncertainty of
the future

• Solar
• Hydro
• Wind farms
• Geothermal
• Biomass
• Biodiesel
• etc

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References

• H. Polinder, M. Damen, and F. Gardner, Linear PM
  Generator System for Wave Energy Conversion,
  IEEE Transactions on Energy Conversion, vol. 19,
  no. 3, Sept. 2004.
• http//eecs.oregonstate.edu/msrf/
• Novel ocean energy permanent magnet linear
  generator buoyRenewable Energy, Volume 31, Issue
  9, July 2006, Pages 1279-1298K. Rhinefrank, E.B.
  Agamloh, A. von Jouanne, A.K. Wallace, J.
  Prudell, K. Kimble, J. Aills, E. Schmidt, P.
  Chan, B. Sweeny, et al.

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• http//eecs.oregonstate.edu/msrf/projects/images/O
  E_2005poster_overview_rev2.jpg
• http//www.google.com/search?hlenclientfirefox-
  arlsorg.mozillaen-USofficialhs2QUsaXoisp
  ellresnum0ctresultcd1qlineargeneratorsfo
  rdirect-drivewaveenergyconversionspell1
• http//usasearch.gov/search?v3aprojectfirstgovv
  projectfirstgovaffiliateoceanservice.noaa.gov
  queryoregon20buoy20data
• http//news.bbc.co.uk/1/hi/sci/tech/1032148.stm
• http//www.ndbc.noaa.gov/maps/Northwest.shtml