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Table 4 Parameter values used in the model to represent different grout materials

From: Numerical investigation on the performance, sustainability, and efficiency of the deep borehole heat exchanger system for building heating

Scenario ID Grout thermal conductivity (W m−1 K−1) Description
2A 0.35 Gap filled with half air and half water
2B 0.68 Gap fully saturated with water
2C 1.3 Filled with concrete
2D 2.1 Thermally enhanced material as grout