Heat-flow characteristics of one-hole and two-hole systems for winning geothermal heat

Using computational models for the behaviours of one-hole and two-hole systems, their relative characteristics have been deduced. The characteristics apply for maximum geothermal-heat extraction at different temperatures of geothermal water at only one given temperature of injected water. Exemplary characteristics at selected temperatures for the geothermal water, but at different temperatures of the injected water, were also worked out.