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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