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Table 2 Two-loop borehole resistance model results

From: Thermal resistance of borehole heat exchangers composed of multiple loops and custom shapes

N 100p =  2   
Case 1. (mm) f R b
Z =  63.5 0.878 0.196
Z/√2 =  44.9 0.828 0.205
   Avg/2N L =  0.100