Stored heat and cold for a perfect indoor climate

Malmberg Geothermal energy for Arlanda Airport

Generally, there are two different ways to utilize shallow geothermal energy for heating and cooling. Borehole storage means that a number of energy wells are drilled in a defined area forming energy volume. An aquifer system is appropriate in water-rich areas and is often used for large buildings such as hospitals, airports, and other large facilities. The geothermal energy principle is simple. During winter, heat is extracted from the groundwater and the bedrock is cooled down a few degrees. As summer begins, the stored cold accumulated as "free cooling" and the bedrock or the ground water is heated gradually and becomes the source of heat next winter.