Title: Water Energy
1Water Energy
Quick Links
- Usayd Younis
- Thomas Hart
- Jamie Stanger
- Edward Hill
Hydroelectric
Tidal
Wave
2Introduction
- What do we want to do?
- We are making a presentation to show the
different types of water energy that can be used
in exchange for the fossil fuels that are
polluting the earth and are soon going to expire. - The three types of energy we will be showing are
Hydroelectric, Tidal and Wave.
3Hydroelectric
Hydroelectric power is electricity that is
supplied by generating energy from falling or
streaming water. Hydroelectric power is a
so-called renewable energy source. This means
that the source, which provides the energy, can
be renewed. This is because, unlike non-renewable
energy sources such as crude oil, we will not run
out of water fully. It can be renewed after we
have used it for energy generation.
4Hydroelectric
- Pros
- Hydropower has a moderate to high amount of
useful energy and fairly low operating and
maintenance costs. Hydroelectric power plants
emit very little heat-trapping carbon dioxide and
other air pollutants during operation. They have
live spans of two to ten times those of coal and
nuclear plants. The dams that are used in the
power plants help prevent flooding and supply a
regulated flow of irrigation water to the areas
below the dam.
5Hydroelectric
- Cons
- There are some drawbacks to the use of
hydroelectric power. A hydroelectric power plant
takes up a lot of space and this may cause animal
habitats to go lost. Large-scale projects can
threaten recreational activities and disrupt the
flows of rivers. Due to the presence of dams and
reservoirs, fish may not be able to swim to sea
and aquatic life may decrease in the area of the
hydroelectric power plant.
6Hydroelectric
- Political
- Hydroelectric power supplies about 20 of the
world's electricity, and 6 of its total
commercial energy.This is an indication of the
total electricity supply by hydroelectric power
in several different countries- 99 in Norway-
75 in New Zealand- 50 in developing
countries- 25 in China- 13 in the USA - 3,500 jobs for workers in power stations.
7Tidal
- Tidal power works rather like a hydro-electric
scheme, except that the dam is much bigger. - A huge dam (called a "barrage") is built across a
river estuary. When the tide goes in and out, the
water flows through tunnels in the dam. - The ebb and flow of the tides can be used to turn
a turbine, or it can be used to push air through
a pipe, which then turns a turbine. Large lock
gates, like the ones used on canals, allow ships
to pass.
8Tidal
- Pros
- Once you've built the dam, tidal power is free.
- It produces no greenhouse gases or other waste.
- It needs no fuel.
- It produces electricity reliably.
- Not expensive to maintain.
- Tides are totally predictable.
9Tidal
- Cons
- Very expensive to build.
- Affects a very wide area - the environment is
changed for many miles upstream and downstream.
Many birds rely on the tide uncovering the mud
flats so that they can feed. - Only provides power for around 10 hours each day,
when the tide is actually moving in or out. - There are very few suitable sites for tidal power
stations.
10Tidal
- Political
- The tide moves a huge amount of water twice each
day, and harnessing it could provide a great deal
of energy - around 20 of Britain's needs.
Although the energy supply is reliable and
plentiful, converting it into useful electrical
power is not easy. There are eight main sites
around Britain where tidal power stations could
usefully be built, including the Severn, Dee,
Solway and Humber estuaries. Only around 20 sites
in the world have been identified as possible
tidal power stations.
11Wave
There are several methods of getting energy from
waves, but one of the most effective works like a
swimming pool wave machine in reverse. At a
swimming pool, air is blown in and out of a
chamber beside the pool, which makes the water
outside bob up and down, causing waves. At a
wave power station, the waves arriving cause the
water in the chamber to rise and fall, which
means that air is forced in and out of the hole
in the top of the chamber.
12Wave
- Pros
- The energy is free - no fuel needed, no waste
produced. - Not expensive to operate and maintain.
- Can produce a great deal of energy.
13Wave
- Cons
- Depends on the waves - sometimes you'll get loads
of energy, sometimes nothing. - Needs a suitable site, where waves are
consistently strong. - Some designs are noisy.
- Must be able to withstand very rough weather.
14Wave
- Political
- At present, the main stumbling block to
deployment of wave energy devices is funding. The
Government has a very important role to play if
this industry is to be given the chance to fulfil
its potential. The capital costs are the problem,
as it is hard to get companies to invest in
technologies that have not yet been completely
proved. Similar to other forms of renewable
energy sources such as wind and solar, the fuel
is free for the complete lifetime of the scheme.
15Conclusion
- We have shown how these three types of energy can
help the world and the environment to develop a
healthier environment to stop harming the ozone
layer. You have also now learnt how Wave, Tidal
and Hydroelectric energy methods work to generate
better electricity.