Transcription of GROUND-SOURCE (GEOTHERMAL) HEAT PUMPS
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GROUND-SOURCE (GEOTHERMAL) HEAT PUMPS
GROUND-SOURCE ( geothermal ) heat PUMPS by John W. LUND 1. INTRODUCTION When a geothermal resource temperature falls below the 40-50 C range, it is frequently impractical to use the fluid directly for most applications. A heat pump can be used to transfer heat from a low-temperature resource to that of a high-temperature reservoir, thus providing the higher temperature needed for space heating. The process can also be reversed by removing heat from a high-temperature resource and rejecting it to a lower temperature reservoir, thus providing cooling to a space.
The water-source uses a well or an open pond to provide an energy source or sink. Ground-coupled systems have been used in northern Europe for many years, but were not used on a commercial scale in the U.S. until 1980. Ground coupling is used where insufficient well water is available, where the quality of the well
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