Fig. 5From: The deeper the better? A thermogeological analysis of medium-deep borehole heat exchangers in low-enthalpy crystalline rocksOutlet (solid line) and inlet (dashed line) temperatures of a 2000-m BHE with VIT or HDPE pipe and different volumetric rates. The left figure presents temperature development over 25Ā years of simulation and the figure on the right is a close-up of the first year of productionBack to article page