Summary
Highlights
Most geothermal resources are found in areas around plate borders, volcanic eruptions, or earthquake zones. Active volcanic areas have high geothermal energy systems because hot molten rock material (magma) beneath the Earth's surface heats circulating groundwater.
The video introduces the topic of geothermal energy for Grade 9 Science, Quarter 3, Week 3-4. The Philippines ranks third globally in geothermal energy production, with 14.4% of its total power generation coming from this source. Geothermal energy is explained as the heat from the Earth's interior, derived from the Greek words 'geo' (earth) and 'thermi' (heat), originating from melted magma and decaying radioactive substances.
Geothermal energy is generated in two main ways: geothermal power plants and geothermal heat pumps. Geothermal power plants use heat from within the Earth to turn water into steam, which then spins turbines to generate electricity. These plants are typically located near geysers, hot springs, or volcanic activity.
The process involves drilling wells deep into the Earth to pump steam or hot water to the surface. The pressure drop causes water to turn into steam, which spins a turbine connected to a generator. The steam is then cooled in a cooling tower, condensing back to water, which is pumped back into the Earth to restart the cycle.
Due to its location in the Pacific Ring of Fire, the Philippines has numerous volcanic areas suitable for geothermal energy production. Examples of geothermal power plants include Tiwi Geothermal Power Plant in Tiwi, Albay, and Makban Geothermal Power Plant in Calauan, Laguna.
The energy transformation in a geothermal power plant begins with thermal energy (heat energy) from inside the Earth. This is converted into mechanical energy in a turbine and then in a generator, ultimately producing electrical energy.
The second method is through geothermal heat pumps, which remove heat from the fluid in the Earth, concentrate it, and transfer it to a building for heating or cooling purposes.
Advantages include being environmentally friendly, renewable (as reservoirs are replenished naturally), great for heating and cooling, not requiring fuel, and being widely available. Disadvantages involve minor environmental issues, the potential for earthquakes in extreme cases, high upfront costs, location specificity, and the need for proper management to ensure sustainability.