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Table 1 Parameters chosen for this study

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

Parameter Symbol Size/units
Bore diameter D 152 mm (6 in.)
Pipe size d 42 mm (1 1/4 in.)
Pipe c-c spacing S p 64 mm (2 1/2 in.)
Pipe wall (HDPE) DR 11
Pipe thermal conductivity k p 0.389 W/m°C (0.225 BtuH/ft°F)
Pipe thermal resistance R p 0.089 m°C/W (0.154 ft°F/BtuH)
Grout thermal conductivity k g 0.78 W/m°C (0.45 BtuH/ft°F)