A model to study the thermal and fluid dynamics behavior of a system made of directly buried electrical cable in a dry or saturated soil is presented. The governing equations are solved via the finite difference method. Different evaluations are carried out assuming different characteristics for the soil and for the electrical loads. The dimensionless results include a comparison between the thermal resistance of dry and saturated soil as well as the functional link between the thermal resistivity of the soil, ρt, evaluated by means of the IEC 287 standard and the dimensionless parameters of the model proposed by the authors. Finally, a correlation for the Nusselt number is determined exclusively in relation to the design data.
A Comparison of Thermal Performances of Underground Power Cables in Dry and Saturated Soils
BUONANNO, Giorgio;
2000-01-01
Abstract
A model to study the thermal and fluid dynamics behavior of a system made of directly buried electrical cable in a dry or saturated soil is presented. The governing equations are solved via the finite difference method. Different evaluations are carried out assuming different characteristics for the soil and for the electrical loads. The dimensionless results include a comparison between the thermal resistance of dry and saturated soil as well as the functional link between the thermal resistivity of the soil, ρt, evaluated by means of the IEC 287 standard and the dimensionless parameters of the model proposed by the authors. Finally, a correlation for the Nusselt number is determined exclusively in relation to the design data.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
