Aquifer Seasonal Storage
Aquifer thermal energy storage relies on naturally occurring aquifer layers. The system consists of two groups of wells. Groundwater is extracted from one of the well groups and the energy is transferred through a heat exchanger to the district energy system and then the aquifer water is re-injected in the other well group.
During winter the heat of the warm aquifer water is transferred to the district heating system through the heat exchangers. The warm district energy water can then be used directly in ultra-low temperature heating systems like preheating ventilation air or in-floor heating. The cold return water is then re-injected into the cold aquifer. During summer the flow is reversed. Cold aquifer water is used for cooling and re-injected into the warm aquifer.