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Geothermal Energy

Science – Society – Technology

Fig. 3 | Geothermal Energy

Fig. 3

From: The deeper the better? A thermogeological analysis of medium-deep borehole heat exchangers in low-enthalpy crystalline rocks

Fig. 3

Comparison of thermal energy produced by constant heat extraction over 25 years, with the outlet temperature and specific heat rate at high and low flow rates for each modelled depth, location, and two collector pipe types. The highest flow rates for VIT are 5 L/s at all pipe lengths, while for HDPE pipe they are 5 L/s at 1 km and 10 L/s at 2 km and 3 km. The lowest flow rates are 1 L/s for VIT at all pipe lengths and for 1 km of HDPE pipe, and 2 L/s for 2 km and 3 km HDPE pipe. Because flow rate is not similar in all cases, the solid and dashed lines do not represent interpolation

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