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Fig. 14 | Geothermal Energy

Fig. 14

From: Effect of groundwater forced seepage on heat transfer characteristics of borehole heat exchangers

Fig. 14

Average heat transfer rates per unit borehole depth of BHEs (\(\bar{q}\) = (ρrcrMΔ\(\bar{T}\))/H) in the fine sand layer over the whole operation period under different pumping–injection flow volume ∑G: aG = 0 m3 d−1; bG = 200 m3 d−1; cG = 400 m3 d−1; dG = 600 m3 d−1; eG = 800 m3 d−1; f ∑G = 1200 m3 d−1

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