Introduction to Geothermal Energy

What Is Geothermal Energy?

Geothermal Energy is defined as “energy from the internal heat of the earth”

• 47% of the incoming radiation from the sun
  is absorbed by the earth
• The remainder is absorbed by the atmosphere
  or reflected back into space

Translated: Geo-Thermal means “Earth-Heat”

“High Temperature” Geothermal Energy

• Energy Source for Hot springs and geysers
• Temperatures exceed 300°F
• Converted to produce useable heat and electricity

  

Energy Efficiency – Building Blocks

Step 1 – Reduce Energy Load

• Site Orientation and Building Arrangement
• Efficient and Effective Building Envelope

Step 2 – Improve Efficiency of Systems and Equipment

• HVAC Systems – Geothermal Systems
• Efficient A/C units, Boilers, Motors, Light Fixtures
• Lighting Systems – Daylighting
• Computers and Office Equipment

Step 3 – Effective Building Operations

• Proper Control – Energy Management Systems
• Commissioning
• Operations and Maintenance – Training and Support
• Leverage Utility Company Rate Schedules

Step 4 – Alternative Energy Sources

• Renewable Energy Options – Solar, Wind, Biomass

"Low Temperature” Geothermal Energy

• Heat Energy contained near the surface of the Earth
• Shallow Earth temperatures fluctuate with seasonal outside air temperature
• Earth temperature becomes more stable with increasing depth
• Nearly constant Earth temperatures at depths below 16 feet
• Earth mean temperature approaches annual average outside air temperature
• Deep Earth temperatures start to increase at depths below 400 feet – at about 1 °F per 100 feet