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Table 1 Material’s physical property parameter

From: Heat transfer analysis of underground U-type heat exchanger of ground source heat pump system

  ρ [kg/m3] cp [J/kg.k] λ [W/m.k] η [Pa.s]
Water 993.9 4147 0.6265 7.275e−04
HDPE pipe 950 2300 0.45  
Backfill soil 1900 900 2.2  
Rock-soil 2530 840 2.58