1 oceanic energy professor s.r. lawrence leeds school of business university of colorado boulder, co...
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Oceanic Energy
Professor S.R. LawrenceLeeds School of Business
University of Colorado
Boulder, CO 80305
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Course Outline
Renewable Hydro Power Wind Energy Oceanic Energy Solar Power Geothermal Biomass
Sustainable Hydrogen & Fuel Cells Nuclear Fossil Fuel Innovation Exotic Technologies Integration
Distributed Generation
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Oceanic Energy Outline
Overview Tidal Power
Technologies Environmental
Impacts Economics Future Promise
Wave Energy Technologies Environmental
Impacts Economics Future Promise
Assessment
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Overview of Oceanic Energy
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Sources of New Energy
Boyle, Renewable Energy, Oxford University Press (2004)
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Global Primary Energy Sources 2002
Boyle, Renewable Energy, Oxford University Press (2004)
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Renewable Energy Use – 2001
Boyle, Renewable Energy, Oxford University Press (2004)
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Tidal Power
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Tidal Motions
Boyle, Renewable Energy, Oxford University Press (2004)
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Tidal Forces
Boyle, Renewable Energy, Oxford University Press (2004)
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Natural Tidal Bottlenecks
Boyle, Renewable Energy, Oxford University Press (2004)
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Tidal Energy Technologies
1. Tidal Turbine Farms
2. Tidal Barrages (dams)
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1. Tidal Turbine Farms
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Tidal Turbines (MCT Seagen)
750 kW – 1.5 MW 15 – 20 m rotors 3 m monopile 10 – 20 RPM Deployed in multi-unit
farms or arrays Like a wind farm, but
Water 800x denser than air Smaller rotors More closely spaced
http://www.marineturbines.com/technical.htm
MCT Seagen Pile
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Tidal Turbines (Swanturbines)
Direct drive to generator No gearboxes
Gravity base Versus a bored foundation
Fixed pitch turbine blades Improved reliability But trades off efficiency
http://www.darvill.clara.net/altenerg/tidal.htm
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Deeper Water Current Turbine
Boyle, Renewable Energy, Oxford University Press (2004)
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Oscillating Tidal Turbine
Oscillates up and down 150 kW prototype
operational (2003) Plans for 3 – 5 MW
prototypes
Boyle, Renewable Energy, Oxford University Press (2004)
http://www.engb.com
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Polo Tidal Turbine
Vertical turbine blades Rotates under a
tethered ring 50 m in diameter 20 m deep 600 tonnes Max power 12 MW
Boyle, Renewable Energy, Oxford University Press (2004)
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Power from Land Tides (!)
http://www.geocities.com/newideasfromtelewise/tidalpowerplant.htm
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Advantages of Tidal Turbines
Low Visual Impact Mainly, if not totally submerged.
Low Noise Pollution Sound levels transmitted are very low
High Predictability Tides predicted years in advance, unlike wind
High Power Density Much smaller turbines than wind turbines for the
same power
http://ee4.swan.ac.uk/egormeja/index.htm
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Disadvantages of Tidal Turbines High maintenance costs High power distribution costs Somewhat limited upside capacity Intermittent power generation
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2. Tidal Barrage Schemes
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Definitions
Barrage An artificial dam to increase the depth of water for
use in irrigation or navigation, or in this case, generating electricity.
Flood The rise of the tide toward land (rising tide)
Ebb The return of the tide to the sea (falling tide)
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Potential Tidal Barrage Sites
Boyle, Renewable Energy, Oxford University Press (2004)
Only about 20 sites in the world have been identified as possible tidal barrage stations
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Schematic of Tidal Barrage
Boyle, Renewable Energy, Oxford University Press (2004)
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Cross Section of a Tidal Barrage
http://europa.eu.int/comm/energy_transport/atlas/htmlu/tidal.html
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Tidal Barrage Bulb Turbine
Boyle, Renewable Energy, Oxford University Press (2004)
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Tidal Barrage Rim Generator
Boyle, Renewable Energy, Oxford University Press (2004)
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Tidal Barrage Tubular Turbine
Boyle, Renewable Energy, Oxford University Press (2004)
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La Rance Tidal Power Barrage Rance River estuary, Brittany (France) Largest in world Completed in 1966 24×10 MW bulb turbines (240 MW)
5.4 meter diameter Capacity factor of ~40% Maximum annual energy: 2.1 TWh Realized annual energy: 840 GWh Electric cost: 3.7¢/kWh
Tester et al., Sustainable Energy, MIT Press, 2005Boyle, Renewable Energy, Oxford University Press (2004)
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La Rance Tidal Power Barrage
http://www.stacey.peak-media.co.uk/Brittany2003/Rance/Rance.htm
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La Rance River, Saint Malo
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La Rance Barrage Schematic
Boyle, Renewable Energy, Oxford University Press (2004)
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Cross Section of La Rance Barrage
http://www.calpoly.edu/~cm/studpage/nsmallco/clapper.htm
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La Rance Turbine Exhibit
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Tidal Barrage Energy Calculations
ARE
gRARmgRE21397
2/)(2/
R = range (height) of tide (in m)A = area of tidal pool (in km2)m = mass of waterg = 9.81 m/s2 = gravitational constant = 1025 kg/m3 = density of seawater 0.33 = capacity factor (20-35%)
kWh per tidal cycle
Assuming 706 tidal cycles per year (12 hrs 24 min per cycle)
AREyr2610997.0
Tester et al., Sustainable Energy, MIT Press, 2005
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La Rance Barrage Example
= 33%R = 8.5 mA = 22 km2
517
)22)(5.8)(33.0(10997.0
10997.026
26
yr
yr
yr
E
E
ARE
GWh/yr
Tester et al., Sustainable Energy, MIT Press, 2005
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Proposed Severn Barrage (1989)
Boyle, Renewable Energy, Oxford University Press (2004)
Never constructed, but instructive
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Proposed Severn Barrage (1989) Severn River estuary
Border between Wales and England 216 × 40 MW turbine generators (9.0m dia) 8,640 MW total capacity 17 TWh average energy output Ebb generation with flow pumping 16 km (9.6 mi) total barrage length £8.2 ($15) billion estimated cost (1988)
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Severn Barrage
Layout
Boyle, Renewable Energy, Oxford University Press (2004)
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Severn Barrage Proposal
Effect on Tide Levels
Boyle, Renewable Energy, Oxford University Press (2004)
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Severn Barrage Proposal
Power Generation over Time
Boyle, Renewable Energy, Oxford University Press (2004)
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Severn Barrage Proposal
Capital Costs
Boyle, Renewable Energy, Oxford University Press (2004)
~$15 billion(1988 costs)
Tester et al., Sustainable Energy, MIT Press, 2005
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Severn Barrage Proposal
Energy Costs
Boyle, Renewable Energy, Oxford University Press (2004)
~10¢/kWh(1989 costs)
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Severn Barrage Proposal
Capital Costs versus Energy Costs
Boyle, Renewable Energy, Oxford University Press (2004)
1p 2¢
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Offshore Tidal Lagoon
Boyle, Renewable Energy, Oxford University Press (2004)
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Tidal Fence
Array of vertical axis tidal turbines
No effect on tide levels Less environmental impact
than a barrage 1000 MW peak (600 MW
average) fences soon
Boyle, Renewable Energy, Oxford University Press (2004)
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Promising Tidal Energy Sites
Country Location TWh/yr GW
Canada Fundy Bay 17 4.3
Cumberland 4 1.1
USA Alaska 6.5 2.3
Passamaquody 2.1 1
Argentina San Jose Gulf 9.5 5
Russia Orkhotsk Sea 125 44
India Camby 15 7.6
Kutch 1.6 0.6
Korea 10
Australia 5.7 1.9
http://europa.eu.int/comm/energy_transport/atlas/htmlu/tidalsites.html
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Tidal Barrage Environmental Factors Changes in estuary ecosystems
Less variation in tidal range Fewer mud flats
Less turbidity – clearer water More light, more life
Accumulation of silt Concentration of pollution in silt
Visual clutter
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Advantages of Tidal Barrages
High predictability Tides predicted years in advance, unlike wind
Similar to low-head dams Known technology
Protection against floods Benefits for transportation (bridge) Some environmental benefits
http://ee4.swan.ac.uk/egormeja/index.htm
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Disadvantages of Tidal Turbines High capital costs Few attractive tidal power sites worldwide Intermittent power generation Silt accumulation behind barrage
Accumulation of pollutants in mud Changes to estuary ecosystem
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Wave Energy
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Wave Structure
Boyle, Renewable Energy, Oxford University Press (2004)
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Wave Frequency and Amplitude
Boyle, Renewable Energy, Oxford University Press (2004)
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Wave Patterns over Time
Boyle, Renewable Energy, Oxford University Press (2004)
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Wave Power Calculations
2
2es TH
P
Hs2 = Significant wave height – 4x rms water elevation (m)
Te = avg time between upward movements across mean (s) P = Power in kW per meter of wave crest length
Example: Hs2 = 3m and Te = 10s
m
kWTHP es 45
2
103
2
22
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Global Wave Energy Averages
http://www.wavedragon.net/technology/wave-energy.htm
Average wave energy (est.) in kW/m (kW per meter of wave length)
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Wave Energy Potential
Potential of 1,500 – 7,500 TWh/year 10 and 50% of the world’s yearly electricity demand IEA (International Energy Agency)
200,000 MW installed wave and tidal energy power forecast by 2050 Power production of 6 TWh/y Load factor of 0.35 DTI and Carbon Trust (UK)
“Independent of the different estimates the potential for a pollution free energy generation is enormous.”
http://www.wavedragon.net/technology/wave-energy.htm
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Wave Energy Technologies
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Wave Concentration Effects
Boyle, Renewable Energy, Oxford University Press (2004)
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Tapered Channel (Tapchan)
http://www.eia.doe.gov/kids/energyfacts/sources/renewable/ocean.html
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Oscillating Water Column
http://www.oceansatlas.com/unatlas/uses/EnergyResources/Background/Wave/W2.html
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Oscillating Column Cross-Section
Boyle, Renewable Energy, Oxford University Press (2004)
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LIMPET Oscillating Water Column
Completed 2000 Scottish Isles Two counter-rotating
Wells turbines Two generators 500 kW max power
Boyle, Renewable Energy, Oxford University Press (2004)
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“Mighty Whale” Design – Japan
http://www.jamstec.go.jp/jamstec/MTD/Whale/
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Might Whale Design
Boyle, Renewable Energy, Oxford University Press (2004)
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Turbines for Wave Energy
Boyle, Renewable Energy, Oxford University Press (2004) http://www.jamstec.go.jp/jamstec/MTD/Whale/
Turbine used in Mighty Whale
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Ocean Wave Conversion System
http://www.sara.com/energy/WEC.html
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Wave Conversion System in Action
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Wave Dragon
http://www.wavedragon.net/technology/wave-energy.htm
Wave DragonCopenhagen, Denmarkhttp://www.WaveDragon.net
Click Picture for Video
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Wave Dragon Energy Output
in a 24kW/m wave climate = 12 GWh/year in a 36kW/m wave climate = 20 GWh/year in a 48kW/m wave climate = 35 GWh/year in a 60kW/m wave climate = 43 GWh/year in a 72kW/m wave climate = 52 GWh/year.
http://www.wavedragon.net/technology/wave-energy.htm
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Declining Wave Energy Costs
Boyle, Renewable Energy, Oxford University Press (2004)
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Wave Energy Power Distribution
Boyle, Renewable Energy, Oxford University Press (2004)
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Wave Energy Supply vs. Electric Demand
Boyle, Renewable Energy, Oxford University Press (2004)
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Wave Energy Environmental Impacts
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Wave Energy Environmental Impact Little chemical pollution Little visual impact Some hazard to shipping No problem for migrating fish, marine life Extract small fraction of overall wave energy
Little impact on coastlines
Release little CO2, SO2, and NOx
11g, 0.03g, and 0.05g / kWh respectively
Boyle, Renewable Energy, Oxford University Press (2004)
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Wave Energy Summary
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Wave Power Advantages
Onshore wave energy systems can be incorporated into harbor walls and coastal protection Reduce/share system costs Providing dual use
Create calm sea space behind wave energy systems Development of mariculture Other commercial and recreational uses;
Long-term operational life time of plant Non-polluting and inexhaustible supply of energy
http://www.oceansatlas.com/unatlas/uses/EnergyResources/Background/Wave/W2.html
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Wave Power Disadvantages
High capital costs for initial construction High maintenance costs Wave energy is an intermittent resource Requires favorable wave climate. Investment of power transmission cables to shore Degradation of scenic ocean front views Interference with other uses of coastal and offshore
areas navigation, fishing, and recreation if not properly sited
Reduced wave heights may affect beach processes in the littoral zone
http://www.oceansatlas.com/unatlas/uses/EnergyResources/Background/Wave/W2.html
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Wave Energy Summary
Potential as significant power supply (1 TW) Intermittence problems mitigated by
integration with general energy supply system
Many different alternative designs Complimentary to other renewable and
conventional energy technologies
http://www.oceansatlas.com/unatlas/uses/EnergyResources/Background/Wave/W2.html
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Future Promise
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World Oceanic Energy Potentials (GW)
Source Tides Waves Currents OTEC1
Salinity World electric2
World hydro
Potential (est) 2,500 GW 2,7003
5,000 200,000 1,000,000
4,000
Practical (est) 20 GW 500 50 40 NPA4
2,800 550
1 Temperature gradients2 As of 1998
3 Along coastlines 4 Not presently available
Tester et al., Sustainable Energy, MIT Press, 2005
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Solar Power – Next Week
http://www.c-a-b.org.uk/projects/tech1.jpg