The document provides an overview of geothermal energy, defining it as a renewable resource that utilizes the Earth's internal heat for electricity production. It discusses different types of geothermal reservoirs and power plants, along with their advantages and disadvantages. The document also highlights global production, various applications, and concludes with insights on initial investments and environmental impacts.

1. GEOTHERMAL ENERGY

2. Index
● I: Definition
● II: Types of geothermal reservoirs
● III: How does a geothermal power plant work?
● IV: Diagram of a geothermal power plant
● V: Types of geothermal power plants
● VI: Advantages and disadvantages
● VII: Worldwide production
● VIII: Uses
● IX: Conclusions

3. I: Definition
● Geothermal energy is a renewable energy that makes
use of the heat inside the Earth.

4. II: Types of geothermal reservoirs
●
Hot water reservoirs
●
Dry reservoirs
●
Geysers

5. III: How does a geothermal
power plant work?
The heat inside the Earth heats up a boiler with
water inside. This makes the water’s temperature
rise and transform it into steam. The steam moves a
turbine connected to a generator that produces
electricity. Then, the steam goes to a condenser
where it becomes water which returns to the boiler
again.

6. IV:Diagram of a geothermal
power plant

7. V: Types of geothermal
power plants
DRY STEAM POWER PLANTS
BINARY CYCLE POWER PLANTS
FLASH STEAM POWER PLANTS

8. DRY STEAM POWER PLANTS
They use steam at a
temperature of 150º C
or higher to run the
turbines.

9. BINARY CYCLE POWER PLANTS
They can operate with
temperatures as low
.as 57º C Water and a
secondary liquid with a
much lower boiling
point pass through a
.heat exchanger This
causes the secondary
fluid to turn into
,steam which is used
.to move the turbines

10. FLASH STEAM POWER PLANTS
In flash steam power
plants, hot water is
sprayed into a tank at
a much lower pressure
than the fluid.

11. VI(1): Advantages
● It is an energy source that reduces the dependence
on fossil fuels
● It causes less environmental impact than the uses
of oil and coal.
● It is a great way to save energy and money.
● It doesn’t generate any noise.

12. VI(2): Disadvantages
● Hydrogen sulfide emissions
● Pollution of nearby waters
● It damages the landscape
● It’s only avaliable in certains locations

13. VII: Worldwide production

14. VIII: Uses
●Heating and hot water
●Electrical energy
●Agriculture
●Aquaculture
●Spas
●Food and wood drying

15. IX: Conclusions
● There is a high initial investment, but after that, less
investment is needed, because it doesn’t use fossil
fuels
● There aren’t any emissions of toxic gases into the
atmosphere
● It produces bad smell
● The employers usually have little experience
● It doesn’t need backup fuel

16. Done by:
●
Catarina Susana Da Silva Lopes
●
Jorge Piñeiro Bermúdez
●
Jorge Hermo González
Bilingual section of Technology
Group 3º ESO-B
IES Praia Barraña – Boiro (Spain)
March, 2016