This document provides information on geothermal and tidal energy. Geothermal energy uses heat from within the earth and requires fluid, heat, and permeability. There are three main types of geothermal power plants. Geothermal energy has advantages such as being environmentally friendly and renewable, though it also has high costs and can cause earthquakes. Tidal energy uses the rise and fall of tides to power turbines and generate electricity. It requires a minimum tidal range of 7 meters and can be captured using tidal streams, barrages, or lagoons. Tidal energy is predictable but has high construction costs and can impact marine life. Both energy sources can be used to generate electricity and for heating applications.
Coastal and mangrove vulnerability assessment In the Northern Coast of Java, ...
56 GEOTHERMAL AND TIDAL.pptx
1. Topic name
Geothermal and tidal energy
Submitted by
Tehmina Bibi
Roll no 56
Submitted to 2020-GCBT-176
Dr.imtiaz Durani sahb
Class: bs chemistry
Semester : 3
Government Post Graduate College Taunsa Shairf
4. Geothermal energy
The Word geothermal Comes from geo(earth) and therme (heat)
The geothermal energy is heat energy obtained from earth Which is stored in earth surface area due to decay of
material.
Requirements
A geothermal resource requires fluid, heat and permeability in order to generate electricity:
Fluid—Sufficient fluid must exist naturally or be pumped into the reservoir.
Heat—The earth’s temperature naturally increases with depth and varies based on geographic location.
Permeability—In order to access heat, the fluid must come into contact with the heated rock, either via natural
fractures or through stimulating the rock.
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5. Geothermal power plant
Flash steam power plant
Hot water at high pressure when released from deep resviror from
high pressure steam(flash steam)
This steam derives the turbine
This is most common type of power plant using today
6. Dry steam plant
Usually gysers are the main source of dry steam
Reservoir which Produces steam with small quantity Of water use
this type of plant
A rock Cather is used to protect turbine from rocks coming with
steam
7. Binary cycle power plant
In this the geothermal water is passed through a heat exchanger
where it’s heat is transferred to a secondary liquid
Liquids having lower boiling point are used as secondary liquids
The vapours of this liquid are used to rotate the turbine
The binary system are used for geothermal energy which are at
relatively at low temperature
Heat loss is minimum because system is completely closed
11. Tidal energy
Tides are the waves caused due gravital Pull of sun or moon
The rise is called high and fall is called lOw tides
The rise and fall occur twice a day and causes enormous water
movements.
Tidal energy is a form of renewable energy which is created by
converting energy from tides into electricity using various
methods.
12. Requirements
Tidal range may vary over a wide range (4.5-12.4 m) from site to site. A
tidal range of at least 7 m is required for economical operation and for
sufficient head of water for the turbines.
Tidal energy generation
Tidal streams
Make use of kinetic energy of water movement to power turbine
This method is gaining popularity because it is removableit can be
scaled up gradually
13. Barrages
Barrages use potential energy in the difference in height or head
between low and high tides
They are essentially dam on low and high tides Or mouth of river
that has a free flowing connection to the oceans
Barrages have a very high costs,a worldwide shortage of viable
place and associated environmental concerns
14. Tidal lagoons
A tidal lagoon is a power station that generates electricity from
the natural rise and fall of the tides. Tidal lagoons work in a
similar way to tidal barrages by capturing a large volume of water
behind a man-made structure which is then released to drive
turbines and generate electricity.
15. Advantages
Some advantages of tidal energy are:
•A highly predictable energy source
•High energy density
•Operational and maintenance costs are low
•An inexhaustible source of energy
16. Disadvantages
•High tidal power plant construction costs.
•Negative influence on marine life forms.
•Location limits.
•The variable intensity of sea waves.
17. Uses
We can use tidal energy to supply electricity to our homes and
businesses. We can use tidal energy in some places instead of
burning coal and oil that contribute to global warming. Tidal
generators (or turbines) work like wind turbines, except it is ocean
currents, not wind, that turns them.
