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Fig. 3 | Geothermal Energy

Fig. 3

From: Impact of operational temperature changes and freeze–thaw cycles on the hydraulic conductivity of borehole heat exchangers

Fig. 3

Schematic sketch of the pilot-scale experiment. Test vessel with internal latex sleeve, soil filling (A) and grouted double U-pipe BHE (B). Temperature sensors (C), flow path separation (D), inlet- and return flow temperature control of the BHE carrier fluid (E, F), temperature control of tank shell (G). Pneumatic pressure control (H inflow, J outflow and M cell pressure), hydraulic conductivity measurement via position tracking of hydraulic cylinders between flow approaching the sample from below (I) and separated return flow (L, K). Cell pressure and measurement of displacement (N), differential pressure measurement (O) and data logger (P). Not shown: external thermal insulation

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