Relating thermal conductivity of soil skeleton with soil texture by the concept of “local thermal conductivity fluctuation”

Experimental And Numerical Invetigation Of Dependence Of Soil Thermal Conductivity On Temperature Water Content, And Soil Texture

10.32920/ryerson.14663220 ◽

2021 ◽

Author(s):

Behnam Jowkar-Baniani

Keyword(s):

Thermal Conductivity ◽

Water Content ◽

Soil Texture ◽

Conductivity Data ◽

Soil Thermal Conductivity ◽

Pump System ◽

Heat Pump System ◽

Thermal Conductivity Data ◽

Apparent Thermal Conductivity ◽

The Impact

Comprehensive set of thermal conductivity data for a loam soil was generated, for temperature variations from 5ºC to 92ºC and water content variations from dry to saturation, and compared to two other soil textures. The results exhibited similar characteristics as those of the other textures, where a significant change in soil thermal conductivity was. Using the thermal conductivity data sets, a model representing heat and mass transfer in soil was used to study the apparent thermal conductivity due to vapour migration. In addition, a computer simulation of a ground source heat pump system was developed, where the experimental data was used to investigate the impact of water content and soil texture variation on the GSHP performance. It was observed that the GSHP energy consumption varied more prominently when the soil wetness varied from dryness to full saturation and less significantly when the soil type varied from coarse to finer texture.

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Effect of dry density, soil texture and time-spatial variable water content on the soil thermal conductivity

Geomechanics and Geoengineering ◽

10.1080/17486025.2015.1048313 ◽

2015 ◽

Vol 11 (2) ◽

pp. 149-158 ◽

Cited By ~ 20

Author(s):

Saeid Nikoosokhan ◽

Hossein Nowamooz ◽

Cyrille Chazallon

Keyword(s):

Thermal Conductivity ◽

Water Content ◽

Soil Texture ◽

Spatial Variable ◽

Dry Density ◽

Soil Thermal Conductivity ◽

Variable Water

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Experimental And Numerical Invetigation Of Dependence Of Soil Thermal Conductivity On Temperature Water Content, And Soil Texture

10.32920/ryerson.14663220.v1 ◽

2021 ◽

Author(s):

Behnam Jowkar-Baniani

Keyword(s):

Thermal Conductivity ◽

Water Content ◽

Soil Texture ◽

Conductivity Data ◽

Soil Thermal Conductivity ◽

Pump System ◽

Heat Pump System ◽

Thermal Conductivity Data ◽

Apparent Thermal Conductivity ◽

The Impact

Comprehensive set of thermal conductivity data for a loam soil was generated, for temperature variations from 5ºC to 92ºC and water content variations from dry to saturation, and compared to two other soil textures. The results exhibited similar characteristics as those of the other textures, where a significant change in soil thermal conductivity was. Using the thermal conductivity data sets, a model representing heat and mass transfer in soil was used to study the apparent thermal conductivity due to vapour migration. In addition, a computer simulation of a ground source heat pump system was developed, where the experimental data was used to investigate the impact of water content and soil texture variation on the GSHP performance. It was observed that the GSHP energy consumption varied more prominently when the soil wetness varied from dryness to full saturation and less significantly when the soil type varied from coarse to finer texture.

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Temperature Changes in the Vicinity of Thermally Loaded Structure Embedded in the Soil: Effect of Sand Content and Saturation Degree

Studia Geotechnica et Mechanica ◽

10.1515/sgem-2017-0016 ◽

2017 ◽

Vol 39 (2) ◽

pp. 61-71

Author(s):

Adrian Różański

Keyword(s):

Thermal Conductivity ◽

Solid Phase ◽

Rapid Development ◽

Degree Of Saturation ◽

Soil Thermal Conductivity ◽

Soil Medium ◽

Temperature Changes ◽

Soil Skeleton ◽

Soil Conductivity ◽

Loaded Structure

Abstract Due to the rapid development of geothermal technologies, the problem of efficient and proper evaluation of soil thermal conductivity becomes extremely important. Factors mostly affecting the soil conductivity are the conductivity of solid phase and the degree of saturation. The former one is mainly affected by the mineral composition, in particular, by the content of quartz whose conductivity is the highest one among all the minerals forming soil skeleton. Organic matter, because of its relatively low conductivity, influences the solid conductivity as well. The problem addressed in the paper is the influence of mentioned factors on temperature changes in the vicinity of thermally loaded structure embedded in the soil medium. Numerical simulations are carried out for different values of soil thermal conductivity resulting from various quartz contents and degrees of saturation. In addition, a weak coupled - heat and water transport - problem is considered.

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