This document summarizes different types of non-conventional energy resources, including ocean thermal energy conversion (OTEC), ocean wave energy, and tidal power. It describes the open and closed cycles used in OTEC that utilize temperature differences between warm surface water and cold deep water. For wave energy, it discusses how waves form and the oscillating water column technology that uses wave motion to drive turbines. It also notes the challenges in developing these technologies, including high costs. The document provides examples of OTEC and wave energy projects around the world.
There are three basic ways to tap the ocean for its energy. We can use
The ocean's waves.
The ocean's high and low tides .
Temperature differences in the water.
1-Wave Energy
Kinetic energy (movement) exists in the moving waves of the ocean. That energy can be used to power a turbine. The wave rises into a chamber. The rising water forces the air out of the chamber. The moving air spins a turbine which can turn a generator.
When the wave goes down, air flows through the turbine and back into the chamber through doors that are normally closed.
2-Tidal Energy
Two types of tidal plant facilities.
Tidal barrages
Tidal stream generator
There are three basic ways to tap the ocean for its energy. We can use
The ocean's waves.
The ocean's high and low tides .
Temperature differences in the water.
1-Wave Energy
Kinetic energy (movement) exists in the moving waves of the ocean. That energy can be used to power a turbine. The wave rises into a chamber. The rising water forces the air out of the chamber. The moving air spins a turbine which can turn a generator.
When the wave goes down, air flows through the turbine and back into the chamber through doors that are normally closed.
2-Tidal Energy
Two types of tidal plant facilities.
Tidal barrages
Tidal stream generator
Wind Power History
Advantages & Disadvantages
Wind Turbine & Components
Power From Wind Mill
Swept area Of Wind Mill Rotor
Wind Speed Variation with Height
Density & Temperature Variation with Height
Global Wind Patterns
Wind Speed Measurements
Wind Speed Distribution
Weibull Probability Distributions
This power point presentation deals ocean energy conversion technique. This tells how ocean energy convert in to useful energy i.e. in accessible form.
This report discusses the potential contribution that energy derived from the tides and waves can make to overall energy supply in a sustainable way. It covers the topics of wide range like how tides and waves are formed; functions of the possible and popular power generation systems especially tidal barrages,turbines, oscillating water columns and wave farms. Advantages and disadvantages of tidal and wave energy are also briefly discussed. Some cost data’s used give us brief insight into the economic prospects of the tidal and wave energy. By turning to potential along the Indian coastline, we found that India do have a huge potential of tidal and wave energy, though it has started very late. Government
initiatives and extensive research focused on the mentioned relevant opportunities will surely change the energy scenario.
Sea waves have high energy densities, the highest among renewable energy sources with the natural seasonal variability of wave energy following the electricity demand in temperate climates securing energy supplies in remote regions.
Comenius Water for Life - presentation by Martyna Borek, Paulina Borek, Piotr Rzepka and Mateusz Kot - students of Gimnazjum Publiczne im. A. Wajdy w Rudnikach
Tidal power, sometimes called tidal energy, is a form of hydropower that exploits the rise and fall in sea levels due to the tides, or the movement of water caused by the tidal flow. Because the tidal forces are caused by interaction between the gravity of the Earth, Moon and Sun, tidal power is essentially inexhaustible and classified as a renewable energy source.
Tidal power can be classified into two types. Tidal stream systems make use of the kinetic energy from the moving water currents to power turbines, in a similar way to underwater wind turbines. This method is gaining in popularity because of the lower ecological impact compared to the second type of system, the barrage. Barrages make use of the potential energy from the difference in height (or head) between high and low tides, and their use is better established.
Ocean Thermal Energy Conversion SystemsNaveen Kumar
OTEC or OCEAN THERMAL ENERGY CONVERSION, is a renewable energy technology that converts solar radiation to electric power by use of the world oceans. The use of OTEC as a source of electricity will help reduce the state’s almost complete dependence on imported fossil fuels. About one fourth of the 1.7 * 1013 watts of solar energy reaching the earth’s atmosphere is absorbed by sea water. OTEC can be considered as an indirect solar technology because the surface water are warmed by the sun. OTEC can also be used to produce ammonia, hydrogen, aluminium, chlorine and other chemicals.
Wind Power History
Advantages & Disadvantages
Wind Turbine & Components
Power From Wind Mill
Swept area Of Wind Mill Rotor
Wind Speed Variation with Height
Density & Temperature Variation with Height
Global Wind Patterns
Wind Speed Measurements
Wind Speed Distribution
Weibull Probability Distributions
This power point presentation deals ocean energy conversion technique. This tells how ocean energy convert in to useful energy i.e. in accessible form.
This report discusses the potential contribution that energy derived from the tides and waves can make to overall energy supply in a sustainable way. It covers the topics of wide range like how tides and waves are formed; functions of the possible and popular power generation systems especially tidal barrages,turbines, oscillating water columns and wave farms. Advantages and disadvantages of tidal and wave energy are also briefly discussed. Some cost data’s used give us brief insight into the economic prospects of the tidal and wave energy. By turning to potential along the Indian coastline, we found that India do have a huge potential of tidal and wave energy, though it has started very late. Government
initiatives and extensive research focused on the mentioned relevant opportunities will surely change the energy scenario.
Sea waves have high energy densities, the highest among renewable energy sources with the natural seasonal variability of wave energy following the electricity demand in temperate climates securing energy supplies in remote regions.
Comenius Water for Life - presentation by Martyna Borek, Paulina Borek, Piotr Rzepka and Mateusz Kot - students of Gimnazjum Publiczne im. A. Wajdy w Rudnikach
Tidal power, sometimes called tidal energy, is a form of hydropower that exploits the rise and fall in sea levels due to the tides, or the movement of water caused by the tidal flow. Because the tidal forces are caused by interaction between the gravity of the Earth, Moon and Sun, tidal power is essentially inexhaustible and classified as a renewable energy source.
Tidal power can be classified into two types. Tidal stream systems make use of the kinetic energy from the moving water currents to power turbines, in a similar way to underwater wind turbines. This method is gaining in popularity because of the lower ecological impact compared to the second type of system, the barrage. Barrages make use of the potential energy from the difference in height (or head) between high and low tides, and their use is better established.
Ocean Thermal Energy Conversion SystemsNaveen Kumar
OTEC or OCEAN THERMAL ENERGY CONVERSION, is a renewable energy technology that converts solar radiation to electric power by use of the world oceans. The use of OTEC as a source of electricity will help reduce the state’s almost complete dependence on imported fossil fuels. About one fourth of the 1.7 * 1013 watts of solar energy reaching the earth’s atmosphere is absorbed by sea water. OTEC can be considered as an indirect solar technology because the surface water are warmed by the sun. OTEC can also be used to produce ammonia, hydrogen, aluminium, chlorine and other chemicals.
Luis Vega from the National Marine Renewable Energy Center describes the technical and economic aspects of Ocean Thermal Energy Conversion (OTEC). Slides from the REIS seminar series at the University of Hawaii at Manoa on 2009-10-01.
Our goal is to generate competitive and sustainable base-load power through Ocean Thermal Energy Conversion (OTEC) and attractive energy efficient alternatives to air conditioning through Seawater District Cooling (SDC), as well as affordable potable water, sustainable food production, and economic development opportunities to our customers.
Principle
OTEC
methods (open cycle & close cycle) energy from tides
components of tidal power plants
Operation
methods of utilization of tidal energy
Storage
ocean waves
wave energy conversion devices
Ocean wave machine is rotated by wave energy. Wave machine drives the generator rotor, pump to store the water at high level, compressor to store the air in compressed air storage plant. Here it is presented the different method to harness wave energy.
General objective
discuss the various ocean energy sources
interpret the energy transformation in wave energy conversion
discuss the working of various type wave energy plant
Specific objectives
define the wave energy
write benefits and application of wave energy system
explain the types of wave energy plant
Tidal Energy the most common topic in science section and one of the most interesting topic . This slides contains the information how does actually tidal energy in generated and what are the advantages and disadvantages of tidal energy . Wave power design and how it works . This topic is mostly used as a project in schools and colleges in science section in higher schools
Explains how energy from tides is produce and mechanically obtained. A practical application of Hydraulic Machines. After reading this you will be able to understand the tidal energy, waves, and ways we use to obtain energy or generate electricity practically.
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Ocean thermal energy conversion
1. Non-Convectional Energy
Resources
Presentation by :-
Pankaj Kumar
Poras Sancheti
Ambrish Pote
Deepak Malche
Under the guidance of - Prof. Nilesh Varkute
FR. CONCEICAO RODRIGUES INSTITUTE OF TECHNOLOGY, VASHI
3. WHAT IS OTEC ?
• The operation of otec is based on thermodynamic
principle.
• If a heat source is high temperature and a heat sink at
lower temperature, this temperature difference can be
utilized in a machine to convert it into mechanical
energy and thereby into electrical energy.
• In the otec system, the warm ocean surface is the heat
source and the deep colder water provides the sink.
5. OPEN (CLAUDE) CYCLE
• Open-cycle OTEC uses the tropical oceans' warm
surface water to make electricity.
• When warm seawater is placed in a low-pressure
container, it boils.
• The expanding steam drives a low-pressure turbine
attached to an electrical generator.
• The steam, which has left its salt behind in the low-
pressure container, is almost pure fresh water. It is
condensed back into a liquid by exposure to cold
temperatures from deep-ocean water.
7. CLOSED (ANDERSON) CYCLE
• Closed-cycle systems(Rankine) use fluid with a low-
boiling point, such as ammonia, to rotate a turbine to
generate electricity.
• Warm surface seawater is pumped through a heat
exchanger where the low-boiling-point fluid is
vaporized. The expanding vapor turns the turbo-
generator. Then, cold deep seawater is pumped
through a second heat exchanger which condenses the
vapor back into liquid, which is then recycled through
the system.
9. ADVANTAGES
• Eco- friendly
• Minimal maintenance costs compared to other power
production plants
• The 41 °F (5 °C) cold seawater made available by an
OTEC system creates an opportunity to provide large
amounts of cooling to industries and homes near the
plant.
• Fresh water is the first by-product . A small 1 MW
OTEC is capable of producing some 4,500 cubic
meters of fresh water per day, enough to supply a
population of 20,000 with fresh water.
10. DISADVANTAGES
• OTEC produced electricity at present would cost
more than electricity generated from fossil fuels at
their current costs.
• OTEC plants must be located where a difference of
about 20º C occurs year round. Ocean depths must be
available fairly close to shore-based facilities for
economic
• No energy company will put money in this project
because it only had been tested in a very small scale.
• Construction of OTEC plants in coastal waters may
cause localized damage to marine ecosystems.
15. Introduction
Renewable energy technologies provide alternatives to
fossil-fueled power plants for the generation of
electricity, an essential step towards reducing our
nation’s dependence on fossil fuels.
One category of emerging renewable energy
technologies relates to OCEAN ENERGY.
17. Wave Energy
Where does wave energy originate?
– Differential warming of the earth causes pressure
differences in the atmosphere, which generate
winds
– As winds move across the surface of open bodies
of water, they transfer some of their energy to the
water and create waves
18. Wave Energy
The amount of energy transferred and the size of the
resulting wave depend on
– the wind speed
– the length of time for which the wind blows
– the distance over which the wind blows, or fetch
Therefore, coasts that have exposure to the prevailing
wind direction and that face long expanses of open
ocean have the greatest wave energy levels.
19. Wave Energy
The strongest
winds blow
between 30˚ and
60˚ in latitude.
Western
coastlines at
these latitudes
experience the
most powerful
waves.
Global Wave Energy Resource Distribution
(measuring the amount of power in kW contained in each linear
meter of wave front)
20. Wave Energy
• The Electric Power Research Institute (EPRI)
estimates that the annual average incident wave
energy off of the U.S. coastline amounts to 2100
terawatt hours per year. (A terawatt equals a trillion
watts.)
• Harnessing 20% of that total energy at 50%
conversion efficiency would generate as much
electricity as conventional hydropower currently
provides – 7% of total U.S. electricity consumption,
or 270 terawatt hours per year.
21. How do we harness
wave energy?
In order to extract this energy, wave energy conversion
devices must create a system of reacting forces, in
which two or more bodies move relative to each
other, while at least one body interacts with the
waves.
There are many ways that such a system could be
configured.
22. Wave Energy Technologies
• Waves retain energy differently depending on water
depth
– Lose energy slowly in deep water
– Lose energy quickly as water becomes shallower
because of friction between the moving water
particles and the sea bed
• Wave energy conversion devices are designed for
optimal operation at a particular depth range
23. Wave Energy Technologies
Therefore, devices can be characterized in terms of
their placement or location.
– At the shoreline
– Near the shoreline
– Off-shore
One wave energy conversion system that has proven
successful at each of these locations is the
OSCILLATING WATER COLUMN.
24. Oscillating Water Column
An Oscillating Water Column (OWC) consists of a
partially submerged structure that opens to the
ocean below the water surface. This structure is
called a wave collector.
This design creates a water column in the central
chamber of the collector, with a volume of air
trapped above it.
25. Oscillating Water Column
• As a wave enters the
collector, the surface of the
water column rises and
compresses the volume of
air above it.
• The compressed air is
forced into an aperture at
the top of the chamber,
moving past a turbine.
• As the wave retreats, the air
is drawn back through the
turbine due to the reduced
pressure in the chamber.
27. Oscillating Water Column
The type of turbine used is a key element to the
conversion efficiency of an OWC.
Traditional turbines function by gas or liquid flowing in
one direction and at a constant velocity. When the
flow is not always from the same direction or at a
constant velocity – such as in the OWC – traditional
turbines become ineffective.
28. Oscillating Water Column
Different types of turbines have been developed for the
OWC to address this problem.
The technologies have been demonstrated to work in a
number of locations, with varying degrees of
efficiency.
– Wavegen’s LIMPET
– Energetech’s Australia Wave Energy System
29. On-shore versus Off-shore
In spite of the success of this technology in an on-shore
application, most wave energy experts agree that off-
shore or near-shore devices offer greater potential
than shoreline devices.
30. On-shore technologies
Advantages
• Easier to access for
construction and
maintenance
• Less installment costs and
grid connection charges
• Could be incorporated into
harbor walls or water
breaks, performing a dual
service for the community
Disadvantages
• Limited number of suitable
sites / high competition for
use of the shoreline
• Environmental concerns for
on-shore devices may be
greater
• Much less energy available
to on-shore devices because
water depth usually
decreases closer to the
shore
31. Obstacles to Development
The greatest challenge is generating electricity from wave energy
at a cost that is acceptable to the market.
Currently, costs are high
– Lack of federal funding
• The Energy Policy Act of 2005 authorizes the
Department of Energy to conduct research,
development, demonstration, and commercial
application programs for ocean and wave energy
technologies
• Yet the President’s budgets have never appropriated
any funds for these activities, including 2008’s budget
32. Obstacles to Development
– Typically, technologies are being developed by small
companies with limited capital, increasing the chance of
failure with early prototypes. These failures may lead
potential investors to lose confidence in the technologies.
– Being relatively new technologies, they are unfamiliar to
licensing and resource agencies and costly to permit.
33. Conclusion
• There is a large supply of wave energy available
• The technology already exists for extraction of this
energy
• The technical challenges are solvable
• The problems lie in facilitating the testing and
development of the technology to make it more
affordable
– Need federal funding
– Need a regulatory process conducive for rapid deployment
of prototypes and research equipment
34. •The darkened regions shows the potential sites
CASE STUDYOkeanós Pelamis Wave Farm
Aguçadoura/ Póvoa de Varzim, Northern Portugal
36. TIDAL POWER
Tidal power, also called tidal energy, is
A form of hydropower that converts the
energy of tides into useful forms of
power, mainly electricity.
37. • Cause of tides: gravitational force of sun, moon and earth’s rotation
• Two tidal cycles per day: 12 hours, 25 minutes
• Tidal range – large at coastal regions with high depth gradient
• Water can be stored in an estuary during high tide
• Release during low tide, through turbines
BASICS
38. PLANT LOCATION
• Tidal mills built on inlets branching off tidal estuaries
• Average Tidal range : the higher, the better
• Feasibility of plant construction & basin closure
• Environmental consequences
39. THE TIDAL BARRAGE
It’s a huge dam built across a river estuary. When the tide goes in and out, the
water flows through tunnels in the dam.
40. • Tidal range has to be in excess of 5 meters for tidal power to be
feasible.
• The purpose of this dam or barrage is to let water flow through it
into the basin as the tide comes in. As the tide recedes, gates in the
barrage that contain turbines are opened, the hydrostatic head
causes the water to come through these gates, driving the turbines
and generating power.
• Power can be generated in both directions through the barrage but
this can affect efficiency and the economics of the project.
• Components of barrage
- Caissons
- Turbines
42. TIDAL CURRENT TURBINES
• It makes use of kinetic energy
of moving water to power
turbines, in a similar way to
wind turbines that use wind
to power turbines.
• Operates during floods and
ebb tides.
• Consists of a gearbox, a rotor
and a generator.
• These three parts are
mounted on a support
structure.
43. DYNAMIC TIDAL POWER PLANT
• Dynamic Tidal Power Plant (DTP) is new and untested
method of tidal power generation. It would involve creating
large dam like structure extending from the coast straight to
the ocean with a perpendicular barrier at the far end forming a
large ‘T’ shape.
• A single dam can accommodate 8 GW (8000 MW) of installed
capacity.
44. POTENTIAL IN INDIA
• Two estuaries on the west coast : Gulf of Cambay & Gulf of Kutch
in Gujarat
• Gulf of Kutch potential estimated to be 900 MW; annual output of
1.6 TWh
• Potential of Gulf of Cambay : 7000 MW, basin area of 1970 sq-km,
annual output of 15 TWh
• Along east coast : Sunderbans in West Bengal
• 20 MW power estimated in regions of Dungaduani, Belladonna
Creek & Pitts Creek
45. TIDAL ENERGY ESTIMATED DEPLOYMENT in 2010
WORLDWIDE
Key :
EU + EFTA - European Union & European Free Trade Association
CIS - Ex-USSR countries
NAFTA - USA, Canada, Mexico
Asia - All Asian countries and Pacific islands excluding OECD Pacific,
Iran, Asian Republics of former USSR
Estimated
deployment in 2010
Estimated deployment
in 2010
TWh MW
WORLD-WIDE 0.586 261.4
EU + EFTA 0.544 240
NAFTA 0.03 17.8
ASIA 0.011 3.2
CIS 0.001 0.4
POTENTIAL
48. ECONOMICS
• Characterized by high capital costs per MW of installed capacity
• High payback period
• Annual operation & maintenance costs are typically less than 0.5
% of initial capital
• Possible consumption of power locally & shorter construction
times for small schemes make them more economic compared to
large ones
• High capital costs & long construction time make tidal energy
sensitive to discount rates
• Non-energy benefits should be taken into account in assessing
potential schemes
49. Mumbai – A potential site for tidal
power plant