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• W963950107 abstract "Due to varying thermal conditions in the ground caused by heat transfer or climate induced variations the local water content changes and consequently hydraulic and thermal properties change as well. Besides the climate the exchange of heat in the partially saturated subsoil strongly influences its hydraulic and thermal properties. It is important to be able to make reliable forecasts of the thermal and hydraulic properties of partially saturated soils and embedding materials for the design of structures and constructions using thermal energy in the shallow ground. The liquid water contained in partially saturated porous media is in direct interaction with the vapor phase of water. In particular, in addition to the conductive portion of the heat transported, the heat transfer in the vapor and the aqueous phase and the occurrence of a phase transition is of critical importance. Resilient data of the hydraulic and thermal properties as a function of the water content are required for the simulation of changes in working conditions. An evaporation test was accordingly developed which enables the simultaneous determination of several hydraulic and thermal parameters at variable water contents of soils and artificial bedding materials. From the data, an interrelation between thermal conductivity and water content, as well as an interrelation between thermal conductivity and water retention characteristics are derived. The retention characteristics of a backfill material or soil sample are determined in an evaporation test, while unsaturated hydraulic conductivity and thermal conductivity are measured simultaneously as a function of the water content. Thermal conductivity is determined using a full space line source embedded in the sample. These tests are currently a variety of experiments carried out to generate a statistically representative number of measurements on different soil types and artificial bedding materials. To provide technically and economically efficient heat input or heat withdrawal (e.g. through a seasonal heat storage installation), modelling of hydraulic and thermal properties of the backfill material and soil requires the input of reliable thermal and hydraulic parameters. To implement these data into FEM modelling, it is necessary to describe them by mathematical expressions representing the interdependence of water retention, unsaturated hydraulic and thermal conductivity. Currently, various mathematical models are developed on the basis of these data and validated against the growing data set." @default.
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• W963950107 date "2015-01-01" @default.
• W963950107 modified "2023-09-26" @default.
• W963950107 title "Influence of the Hydraulic Properties of Unconsolidated Rocks and Backfill Materials on the Change of the Thermophysical Characteristics by Heat Transfer" @default.
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