Numerical Research and Parametric Study on the Thermal Performance of a Vertical Earth-to-Air Heat Exchanger System

Table 3

Several common parameters of thermo-physical properties of soil.

Type of soil	Density (kg m^−3)	Thermal conductivity (W m^−1 K^−1)
Dense clay (moisture of 15%)	1925	1.7
Dense clay (moisture of 5%)	1925	1.2
Light clay (moisture of 5%)	1285	0.7
Tight sand (moisture of 5%)	1925	2.2
Light sand (moisture of 5%)	1285	1.1