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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 | 152Â mm (6Â in.) |
Pipe size | d | 42Â mm (1 1/4Â in.) |
Pipe c-c spacing | S p | 64Â 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) |