Fig. 3From: City-scale heating and cooling with aquifer thermal energy storage (ATES)Exemplary box model of a 2-doublet ATES system in the Neuenburg Formation in hydrogeological region 1. The injection wells are implemented via 1st kind BCs (temperature) and 2nd kind BCs (mass flow rate). The extraction wells are implemented using 2nd kind BCs (mass flow rate). The black lines mark the ± 1 K-isotherms and ± 0.5 K-isotherms, respectivelyBack to article page