Article | REF: BE8591 V1

Surface geothermal science. Presentation and heat pumps

Authors: Philippe LAPLAIGE, Jean LEMALE

Publication date: April 10, 2010

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2. Heat pumps

2.1 Principle

The heat pump principle has been known for a long time. It involves transferring heat from a low-temperature medium (cold source) to a higher-temperature medium (hot source) (figure 1 ). This transfer takes place via a refrigerant fluid, and requires the input of energy in the form of work.

In the case of a dwelling heated by a heat pump, the cold source is the outside environment, from which heat can be extracted:

  • or in ambient air ;

  • or in the land on which the house is built;

  • either in the water of a nearby river or in the water of...

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