Geothermal Energy Responsible for information in Yellow..

Geothermal Features Boyle, Renewable Energy, 2 nd edition, 2004

1. Geysers – Hot water and steam Clepsydra Geyser in Yellowstone

2. Hot Springs – Hot water only Hot springs in Steamboat Springs area.

3. Fumaroles – Steam only Clay Diablo Fumarole (CA) White Island Fumarole New Zealand

Geothermal Energy

Geothermal in Context Energy Source P P Total a a Fossil Fuels Coal Coal Coke Net Imports Natural Gas b b Petroleum c c Electricity Net Imports Nuclear Electric Power Renewable Energy Conventional Hydroelectric Geothermal Energy Biomass d d Solar Energy Wind Energy U.S. Energy Consumption by Energy Source, (Quadrillion Btu) energy-do-we-use/

Advantages of Geothermal Low CO 2 production Very cheap

Global Geothermal Sites

Geothermal Sites in US

Extracting Geothermal Energy

Geothermal Energy for Electricity: How it works Holes are drilled down to the geothermal hot region, steam or hot water comes up which is used to drive turbines. The turbines drive generators that make electricity.

Types of Geothermal Power Plants: Dry steam power plant: Steam comes directly from ground to drive turbines. Single flash power plant: Hot water (360F) under pressure is pumped from ground and “flashed” to steam which drives turbines. Binary Cycle power plant: Hot water ( F) is used to turn an organic liquid into a vapor which drives turbines. Boyle, Renewable Energy, 2 nd edition, 2004

Dry Steam Schematic Boyle, Renewable Energy, 2 nd edition, 2004

Single Flash Steam Schematic Boyle, Renewable Energy, 2 nd edition, 2004

Binary Cycle Schematic Boyle, Renewable Energy, 2 nd edition, 2004

Hot Dry Rock Technology 1.Wells drilled 2-3 miles into crust 2.Water pumped in, 3.Hot water/steam returns to surface 4.Steam used to generate power

Hot Dry Rock Technology Fenton Hill, NM plant

Is Geothermal Renewable? Heat is depleted as ground cools but it is considered a renewable resource as long as the ground is not cooled too fast.

Instructions: Use a Texas geothermal map to answer the following questions: 1.What is the temperature of the geothermal reservoir in Collin County? F 1.Power plant an option? NO 2.Other uses? Heat homes, swimming pools, fish farms

Geothermal Heat Pump Heats and cools your house

For heating: A substance called a refrigerant carries the heat from one area to another. When compressed, it is a high temperature, high-pressure liquid. This hot liquid heats the house. For cooling: If the refrigerant in the lines is allowed to expand, it turns into a low temperature, low pressure gas. The gas then absorbs heat from the house and transfers it down into the ground. Geothermal Heat pump: How it works

ng_cooling/geothermal.html heat-pumps Geothermal Heat pump diagram/Video

Heat pumps are about 45% more efficient than a traditional air conditioning/heater combination. You spend about 30%-40% less on your electric bill. (Pays itself off in about 5-10 years.) Geothermal Heat Pump Efficiency