Thermal Conductivity of Standard Sands. Part III. Full Range of Saturation

Tarnawski, V. R.; McCombie, M. L.; Momose, T.; Sakaguchi, Iwao; Leong, Wey H.

doi:10.1007/s10765-013-1455-6

Cited by 63 publications

(36 citation statements)

References 16 publications

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“…However, there is a trend to utilise steadystate methods for rocks (solid mineral matter) and transient methods for soils (e.g., see Reference [40]). [20,33,34,47,66,[70][71][72][73][74]; Sr: degree of saturation, n: porosity.…”

Section: Comparison Of Methodsmentioning

confidence: 99%

“…Tarnawski and collaborators [33,71,72], who used the thermal needle probe, and Nikolaev et al [34], who employed the guarded hot plate, constitute the most recent and complete studies on the dependency of the thermal conductivity of standard sands at different degrees of saturation over a temperature range. For dry sands, in Reference [34] agreement was demonstrated, with a maximum discrepancy of 5.7%, between the measurements performed with the guarded hot plate and the thermal needle probe, as reported by References [33,73,77,78] (see Figure 8).…”

Section: Comparison Of Methodsmentioning

confidence: 99%

“…Regarding unsaturated sands, Reference [72] claimed that the thermal needle probe data exhibit higher values than those obtained from guarded hot plate experiments (data from References [73,74] at 25 • C). They explained this on grounds of induced soil moisture redistribution by substantial temperature gradients applied to the tested samples during long-lasting guarded hot plate experiments, which leads to sample inhomogeneity.…”

Section: Comparison Of Methodsmentioning

confidence: 99%

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Characterisation of Ground Thermal and Thermo-Mechanical Behaviour for Shallow Geothermal Energy Applications

et al. 2017

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Increasing use of the ground as a thermal reservoir is expected in the near future. Shallow geothermal energy (SGE) systems have proved to be sustainable alternative solutions for buildings and infrastructure conditioning in many areas across the globe in the past decades. Recently novel solutions, including energy geostructures, where SGE systems are coupled with foundation heat exchangers, have also been developed. The performance of these systems is dependent on a series of factors, among which the thermal properties of the soil play a major role. The purpose of this paper is to present, in an integrated manner, the main methods and procedures to assess ground thermal properties for SGE systems and to carry out a critical review of the methods. In particular, laboratory testing through either steady-state or transient methods are discussed and a new synthesis comparing results for different techniques is presented. In situ testing including all variations of the thermal response test is presented in detail, including a first comparison between new and traditional approaches. The issue of different scales between laboratory and in situ measurements is then analysed in detail. Finally, the thermo-hydro-mechanical behaviour of soil is introduced and discussed. These coupled processes are important for confirming the structural integrity of energy geostructures, but routine methods for parameter determination are still lacking.

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Section: Comparison Of Methodsmentioning

confidence: 99%

Section: Comparison Of Methodsmentioning

confidence: 99%

Section: Comparison Of Methodsmentioning

confidence: 99%

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Characterisation of Ground Thermal and Thermo-Mechanical Behaviour for Shallow Geothermal Energy Applications

et al. 2017

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“…In order to understand the influences of structural and physical conditions, the study on the thermal conductivity of unsaturated sandy soils has raised particular interest [15][16][17][18][19]. Chen [18] reported an experimental work using four different quartz sands, which had the same over 99% quartz content, but different particle size distribution.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Modelling of the Thermal Conductivity of Sandy Soils of Different Porosities and Water Contents

et al. 2017

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This paper at first reports an experimental work to test the thermal conductivity of formulated sandy soil specimens of different porosities and water contents. Both needle probe and hot-plate methods were conducted and compared. It has been confirmed that the needle probe method has a better accuracy for the measurement of unsaturated soil thermal conductivity, and that the pore size distribution plays an important role on unsaturated soil thermal conductivity. Secondly, it gives out an extensive review on the modelling work, and investigates two major types of empirical models in detail. Two generalized formulas have been suggested to mathematically characterise the two types of models and tested using the experimental data. Finally, in terms of the intrinsic relation to the pore size distribution and the similarity between the thermal conductivity and water retention characteristics of unsaturated soils, a soil water retention model has been suggested and tested to describe unsaturated soil thermal conductivity.

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“…Even though the LHT has been recognised as an error in measuring the thermal conductivity of unsaturated soil with the transient-state heat probe method (Tarnawski et al, 2013) and it is minor compared to heat conduction under atmospheric pressure and low temperature, the LHT is one of the typical phenomena of heat and mass transfer in soil. Under such circumstances, the conventional model (Cary, 1979;de Vries, 1958;Jury and Letey, 1979) and semi-empirical models (Campbell et al, 1994;Tarnawski et al, 2000) of the LHT are still used to estimate the LHT or the parameters relevant to the LHT for simulation of heat and mass transfer in soil for understanding thermal behaviour in soil, in application to agricultural and engineering fields (Fujimaki et al, 2014;Smits et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Issues of conventional model of transfer of latent heat in soil

Sakaguchi¹,

Mochizuki²,

Katayama³

et al. 2017

International Agrophysics

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A b s t r a c t. Upper limit of experimental coefficient between the measured transfer of latent heat and the estimated vapour flux in the frame of the conventional model of latent heat transfer in soil was examined by analysing the measured latent heat transfer and temperature gradient in soil under steady-state temperature gradient. To exclude the temperature gradient as an uncertainty factor from the experimental coefficient, the temperature gradients of overall soil and soil pore were included into the vapour fluxes in the atmosphere. The estimated experimental coefficient did not exceed unity, which indicated that both the latent heat transfer and the vapour fluxes in the soil were smaller than those in the atmosphere. The gap that appeared between the experimental coefficient and the product of the tortuosity factor and air-filled porosity implied the existence of an unidentified parameter relevant to characteristic of the circulation of water in soil which is the main mechanism of latent heat transfer in soil. By quantifying this characteristic with simultaneous measurements of the latent heat transfer, distributions of temperature, water content and solute content in various soils under the steady-state condition, the conventional model would be modified, or an alternative model being independent of the conventional model would be developed.

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Thermal Conductivity of Standard Sands. Part III. Full Range of Saturation

Cited by 63 publications

References 16 publications

Characterisation of Ground Thermal and Thermo-Mechanical Behaviour for Shallow Geothermal Energy Applications

Characterisation of Ground Thermal and Thermo-Mechanical Behaviour for Shallow Geothermal Energy Applications

Experimental Study and Modelling of the Thermal Conductivity of Sandy Soils of Different Porosities and Water Contents

Issues of conventional model of transfer of latent heat in soil

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