ITER Project: How physical-thermal properties of soils affect the heat transfer in very shallow geothermal application

In the near future the shallow geothermal energy resource is becoming increasingly important as renewable energy resource for heating/cooling residential and tertiary buildings.
Therefore, it is worthy of interest to get a better comprehension of how the different soil typologies (i.e. sand, loamy sand...) affect and are affected by the heat transfer exchange with heat collectors, especially when horizontal ones (very shallow geothermal installations) are adopted.