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Table 1 Material properties used in simulation

From: Optimization of operating parameters of earth air tunnel heat exchanger for space cooling: Taguchi method approach

Material Density (kg/m3) Specific heat (J/kg-K) Thermal conductivity (W/m-K)
Air 1.22 1006 0.02
Soil 2050 1840 0.52
PVC pipe 1380 900 0.16