Renewable Energy Resources

Geothermal Energy Resource

Earth Science - STEM

Quezon City Science High School

Mr. Mark Lester M. Cabaluna

Lesson Outline

• Geothermal Energy

  ● Types of Geothermal Energy

  ● Tapping of Geothermal Energy

  ● Availability of Geothermal Energy

Learning Competencies

At the end of the lesson, you are able to:

● Describe how Earth’s internal heat can be transferred by geothermal water

● Explain how heat from the inside of the Earth (geothermal) is tapped as a source of

energy for human use.

● Demonstrate how geothermal energy can be renewal and non-renewable resource

Open Ended

What is Geothermal Energy?

What is Geothermal Energy?

● It is an internal energy beneath the Earth's surface that is accessed or tapped to convert it into electricity to be used by the consumers.

● It is usually tapped in near areas of volcanic origin.

Geothermal Energy

Types of Geothermal Energy

There are three (3) types of Geothermal Energy

• Low-Temperature – ranges from 20°C to 90°C geothermal water; used only for heating.

• Medium-temperature – ranges from 90°C to 160°C geothermal water; geothermal water in liquid form is used to heat another fluid, which vaporizes to drive the turbine of the generator.

• High-temperature – geothermal water above 160°C; water is vaporized and used directly to drive the turbine of the plant’s generator.

Geothermal Energy

Tapping of Geothermal Energy

Here's what you need to take note of:

• Only Medium- to High-Temperature types are possible for tapping.

• Geothermal waters (heated water on groundwater or injected water) were used to generate steam.

• Very hot steam is used to drive the turbine; this generates mechanical energy to electrical energy.

• Used geothermal water is injected back for cycling geothermal energy.

Multiple Choice

Is Geothermal Energy Renewable or Nonrenewable Resource?

• Renewable Resource

• Nonrenewable Resource

• Either Renewable or Nonrenewable

• Neither Renewable nor Nonrenewable

Geothermal Energy

Availability of Geothermal Energy

Geothermal as Renewable and Nonrenewable Source

Geothermal energy is basically considered as a renewable resource. However, some geothermal resources deplete fast in some cases. Here are examples of depleting geothermal resources:

1. Source of heat within is due to radioactive materials or residual heat.

2. Recycling geothermal water back to the source is slower than getting it.