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Table 2 Thermal properties of pipe materials

From: Earth-air heat exchanger as a green retrofit for Chandīgarh—a critical review

Property Concrete PVC Steel
Density (kg/m3) 1800 1400 7800
Thermal conductivity(W/kg/K) 1.15 0.2 45
Specific heat (J/kg/K) 1000 1470 505