Abstract: Although the late start of the geothermal pump technology in China, it has a rapid development in recent years. The geothermal pump has a wide application in hot air and water supplies and air conditioning areas. This paper briefly discusses the principles of the geothermal pump technology and then presents a case history of geothermal application.  The proposed site has a relatively small footprint but a single vertical U pipe could not meet the supply requirement for the building.  A new double vertical U pipe heat exchange system in combining the spiral coil heat exchange system of the foundation piles was developed for the project. The results are satisfactory.

Key words: Geothermal Pump System, Vertical Double U Pipes, Spiral Coils Attached to Pile, Heat Exchange Analysis