Fig. 12
From: Optimizing scenarios of a deep geothermal aquifer storage in the southern Upper Rhine Graben
Efficiency of an aquifer storage (presented as recovery factor) over 10 years (10 storage-heating cycles), each with 175 d long storage and heating cycles per year. Flow rates of 5, 10, 20, 30 and 40 L s−1 were considered in three different operating modes (temperature spreads (∆T), each with constant injection temperature of 80 °C during the storage cycle, but with varying injection temperatures in the heating cycle of 50 (A), 41.6 (B) and 30 °C (C). Please note the different scales on the vertical axes