Presentación

THERMAL CONDUCTIVITY OF SOILS—COMPARISON

OF EXPERIMENTAL RESULTS AND ESTIMATION METHODS

1Usowicz Boguslaw, 2Usowicz Lukasz

1 Institute of Agrophysics, Polish Academy of Sciences, ul, Doświadczalna 4, 20-290 Lublin 27

e-mail: Usowicz@demeter.ipan.lublin.pl

2 ul. Królowej Jadwigi 6/56, 20-282 Lublin, e-mail: lusowicz@gonzo.umcs.lublin.pl

Introduction

To predict heat transfer in soil under the conditions of steady and non-steady heat flow

requires the knowledge of the basic thermal properties of soil (Noborio et al. 1996). While it

is possible to determine the heat capacity per unit volume of soil with fairly good accuracy,

numerous problems are encountered in the determination of thermal conductivity (Kersten

1949; de Vries, 1963, 1986, 1987; Kohnke and Nakshabandi, 1964; Kasubuchi, 1975;

Kossowski, 1977; de Vries and Philip, 1986; Hopmans and Dane, 1986; Abu-Hamdeh, 2001,

2003, Abu-Hamdeh et al., 2001; Bachmann 2001; Gori and Corasaniti, 2003; Nusier and Abu-

Hamdeh, 2003; Tarnawski and Leong, 2000; Usowicz, 1991, 1992).

The propose of this study is to presents an evaluation of method for the calculation of the

thermal conductivity of soil on the basis of comparison of the thermal conductivity of sand,

clay, sandy loam, clay loam, silty loam, silty clay loam and peat, measured and calculated

from the statistical-physical model, de Vries model and numerical method. For loam, the

evaluation was performed on the basis of comparison of results obtained experimentally,

models, Laplace transform, and the method of null-alignment, with and without taking into

account the thermal conductivity resulting from water vapour movement due to temperature

gradient in the soil.

...