Optimal design of a borehole heat exchanger, as the outer part of a ground
source heat pump heating system, requires information on the thermal
properties of the soil. Those data, the effective thermal conductivity of
the soil ?eff and the average temperature of the soil T0, enable us to
determine the necessary number and depth of boreholes. The determination of
thermal conductivity of the soil in laboratory experiments does not usually
coincide with the data under in-situ conditions. Therefore, an in-situ method
of experimental determination of these parameters, the so-called thermal
response test, is presented in this paper. In addition to the description of
the experimental procedure and installation overview, the paper describes
methods based on theory and presents their basic limitations, through the
presentation of experimental data.
Elaboration of in situ phosphorus doped polysilicon films under LPCVD conditions : process modelling and characterization