Fig. 2From: An assessment of technical and economic feasibility to install geothermal well systems across UkrainePrincipal sketch to evaluate GWS thermal output. 1—reservoir; 2, 3—production and injection wells, respectively; 4—accumulator; 5—pumps; 6—heat exchanger; 7—geothermal flux; the other notations can be seen in the textBack to article page