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Ocean Energy

school project on renewable energy
by

Christine Xiang

on 17 December 2013

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Transcript of Ocean Energy

Ocean

Energy

Intro
What is ocean
energy
, first of all? From the dictionary, it is
energy
generated from surface waves or pressure fluctuations below the surface. In our own words, it's
energy
from ocean waves or pressure under the ocean. I know, you want to know why you should use it on your
island
. That comes in later.
Why you should use ocean energy
Why exactly should you have
ocean
energy plants? Well, reason number one: It is renewable. We don't "use up" anything when we generate it. Two : It is very clean. Ocean water is relatively clean and the power plants don't make any smoke or pollution.

How wave energy works
There are three ways scientists think we can generate electricity from waves:
suface devices. These devices gain power from the waves moving them up and down on the surface of the ocean This is one of them:

How tidal energy works
Tidal energy is energy produced by the tides of the ocean. There are also three ways scientists generate tidal energy:
Tidal barrages work like a dam. When the tide goes high, the reservoir fills up. When the tide drops the dam lets the water out. In both directions the moving water can spin the blades of turbines to create electricity. Here's an example:
History of Ocean energy
So, you know a bit about ocean energy, but how did it all start? Well, here's the facts: Technically, wave energy was "invented" in the 1800's, but the modern version of it came into existence thanks to the experiments of Yoshio Masuda in the 1940's. On the other hand, tidal energy has been used to turn water wheels and grind grains since Roman times and the Middle Ages, so it's much older than wave energy.
You really should use ocean energy plants on your island!
By Nick F., Christine, Betty, and Niko
Drawbacks
The main drawbacks to ocean energy plants are:
The limited number of locations where current technology can be installed.
Both wave and tidal energy can have some effect on the environment. Large tidal barrages can make it hard for fish to migrate and spinning turbines can injure animals and fish.
Cost. The cost of installing and maintaining a large wave or tidal power plant is too expensive, versus other alternatives such as wind farms.
Where you should place the power plants
You know what ocean energy does, right? And you know you should use it, right? You're gonna use it, but where are you going to put the power plants? Let me tell you. Ocean power plants should be placed, well, in the ocean. But not near land. Maybe a bit farther from shore. Like this plant:
You can see that it's not near shore, can't you?
Wave Energy:
Underwater Devices
Underwater devices range from balloon type objects attached to the ocean floor to long tubes that stretch over a long distance. When the waves cause them to swing, they move a turbine and create electricity. Here's one of them:
Wave Energy:
Reservoirs
Reservoirs take advantage of the waves moving water into a reservoir(lake-like structure) on the coastline. As water moves back out into the ocean it is forced down a tube and turns the blades of turbine. The turbine then converts the energy into electricity.

Conclusion
There, now you know all about ocean energy, how it works, and why you should use it. And since you know that, you should really use it. Thanks for listening(or reading)!
Tidal Fences
Tidal fences are smaller structures than a barrage. A number of vertical turbines form a fence between two land masses. When the tide moves in or out, the turbines spin and generate electricity.
Tidal turbines
Tidal turbines are individual turbines placed anywhere there is a strong tidal flow.
Locations around the world
Here are three places ocean energy plants are in the world:
In 2008, the world's first commercial tidal power plant SeaGen began operating off the Irish coast. It produces 1.2 megawatts of electricity.
The Jiangxia Tidal Power Station is the fourth largest tidal power station in the world, located in Wuyantou, Wenling City, Zhejiang Province, China.
Sihwa Lake Tidal Power Station is the world's largest tidal power installation, with a total power output capacity of 254 MW, surpassing the 240 MW Rance Tidal Power Station.
Full transcript