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Energy and the Environment

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  1. Introduction
  2. Transport Fuels
    5 Topics
  3. Energy Sources: Fossil Fuels
    8 Topics
  4. Energy Sources: Renewables
    10 Topics
  5. Electricity
    10 Topics
  6. Energy Sources: Nuclear
    6 Topics
  7. Demand Response
    6 Topics
  8. Energy/Emissions Policy
    15 Topics
  9. Energy Economics
    2 Topics
    1 Quiz
Lesson 4, Topic 4
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Geothermal Energy

Abdulaziz July 15, 2020
Lesson Progress
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Trekking Geothermal Pool In Iceland
Geothermal Activity and Geysers
Geothermal Power Plant
Geothermal Power Plant

Geothermal (renewable or not??)

  • A USA agency estimates total energy available to be ~15,000 x energy in all known oil and gas reserves in the world
  • always be available when it is needed
  • not always available where it is needed

Geothermal Power

  • steam brought up from reservoir
  • directed past turbines
  • shaft of turbine turns generator
  • spinning magnets of generator convert rotational energy into electricity
  • depleted steam condensed and re injected
Hot steam from underground is piped directly into turbines, which powers the generator.

Direct heat energy: geothermal

  • Where sufficient accessible geothermal energy is present it can be used for:
    • heating buildings (individually or whole towns)
    • raising plants in greenhouses
    • drying crops
    • heating water (ie fish farms)
    • industrial processes (ie pasteurizing milk)

Geothermal heat pumps

  • shallow ground (upper 3m) maintains a temperature between 10 -16°C
  • in certain countries this is:
    • warmer than the air above it in winter
    • cooler than the air above it in summer
  • heat exchange occurs via:
    • a system of pipes buried in shallow ground
    • a fluid (water and anti freeze) circulates through the pipes to absorb or relinquish heat within the ground