GROUND-SOURCE HEAT PUMPS
GEOTHERMAL DIRECT USE
March 22 & 23, 2006
Salt Lake City, UT
Utah Geothermal Working Group Washington State Univ Energy Prog
U.S. DOE GeoPowering the West UU Energy & Geoscience Inst.
Sound Geothermal Utah Geological Survey SEP
OIT Geo-Heat Center
Ground-Source Heat Pumps (GHP)
• The shallow Earth maintains a nearly constant
temperature between 50° and 60°F (10°–16°C).
• Like a cave, this ground temperature is warmer
than the air above it in the winter and cooler than
the air in the summer.
• GHP systems take advantage of this resource to
heat and cool buildings.
• Three parts: 1. the ground heat exchanger, 2. the heat pump
unit, and 3. the air delivery system (ductwork).
• The heat exchanger is basically a system of pipes called a
loop, buried in the shallow ground near the building.
• A fluid (water/antifreeze) circulates through the pipes to
absorb or relinquish heat within the ground, and deliver it to
• Ground-source heat pumps use less energy than
conventional heating systems, since they draw heat from the
ground. Affordable? Reliable? Convenient?
• All areas of the United States have nearly constant shallow-
ground temperatures, which are suitable for geothermal heat
Galt House East Hotel - Louisville, KY
750,000 sq ft, 1,700 ton GHP
Canyon View High School
Cedar City, Utah
• vertical closed loop
• 300 boreholes @ 300’ deep
• 233,199 ft2
• 550 tons (1,953 kW)
• Geothermal direct use dates back thousands
of years, when people began using hot
springs for bathing, cooking food, and
loosening feathers and skin from game.
• Today, hot springs are still used as spas.
But there are now more sophisticated ways of
using this geothermal resource.
Direct-Use Geothermal System
1.A production facility — normally a well—to bring the heated
water to the surface.
2.A mechanical system—piping, heat exchanger, controls—to
deliver the heat to the space or process.
3.A disposal system—injection well or storage pond—to receive
the cooled geothermal fluid.
Milgro Nurseries, Newcastle, Utah
Geothermal Space Heating
Fish Ladder near Twin Falls, Idaho
The Homestead Crater
The Homestead Crater
60 ft Dive Pool
GEOTHERMAL RESOURCES OF UTAH - 2004
Robert E. Blackett and Sharon Wakefield
Utah Geological Survey 2004 Open-File Report 431
• Geology of Geothermal Resource Areas in Utah
• Thermal Spring and Well Database (~ 1,100)
• Thermal Gradient Boreholes Database (~ 980)
• Annotated Geothermal Bibliography
• GIS Layers - Resource, Land Ownership, Geology,
Roads, Power Grid,
For more information go to:
For more information about geothermal
resources in general:
Geothermal Resources Council
P.O. Box 1350, Davis, CA 95617 | Tel (530)
758-2360 Fax (530) 758-2839