Looking for Geothermal Heat Pump information? Check out these sites!
The International Ground Source Heat Pump Association
• Heat pump designers, installers, and dealers in your area:
The Geothermal Exchange Organization (GEO)
• Industry information and events. Check out
the fact sheets and brochures under their publications tab.
Geo-Center of the Oregon Institute of Technology
• U.S. DOE-funded information center, particularly unique for information on
direct uses such as greenhouses and building heating. Click on their interactive
map to see geothermal projects in your state.
EIA 2010 Heat Pump Report
Typical Direct Use Geothermal Heating System Configuration
Geothermal heat pumps (GHPs) take advantage of the Earth’s relatively constant
temperature at depths of about 10 ft to 300 ft. GHPs can be used almost
everywhere in the world, as they do not share the requirements of fractured rock
and water as are needed for a conventional geothermal reservoir. GHPs circulate
water or other liquids through pipes buried in a continuous loop, either
horizontally or vertically, under a landscaped area, parking lot, or any number
of areas around the building. The Environmental Protection Agency considers them
to be one of the most efficient heating and cooling systems available.
Animals burrow underground for warmth in the winter and to escape the heat of
the summer. The same idea is applied to GHPs, which provide both heating and
cooling solutions. To supply heat, the system pulls heat from the Earth through
the loop and distributes it through a conventional duct system. For cooling, the
process is reversed; the system extracts heat from the building and moves it
back into the earth loop. It can also direct the heat to a hot water tank,
providing another advantage — free hot water. GHPs reduce electricity use 30–60%
compared with traditional heating and cooling systems, because the electricity
which powers them is used only to collect, concentrate, and deliver heat, not to
Geothermal Heat Pump Diagram