Comparison between Measured and Calculated Thermal Conductivities within Different Grain Size Classes and Their Related Depth Ranges

Journal article


Publication Details

Author(s): Bertermann D, Müller J, Freitag S, Schwarz H
Journal: Soil Systems
Publication year: 2018
Journal issue: 2
ISSN: 2571-8789


Abstract

In the field of the efficiency of very shallow
geothermal energy systems, there is still a significant need for
research activity. To ensure the proper exploitation of this energy
resource, the decisive geophysical parameters of soil must be
well-known. Within this study, thermal conductivity, as a fundamental
property for evaluating the geothermal potential of very shallow
geothermal systems, was analyzed and measured with a TK04 device. A
dataset, consisting of various geophysical parameters (thermal
conductivity, bulk density, water content, and porosity) determined for a
large range of different textural soil classes, was collated. In a new
approach, the geophysical properties were visualized covering the
complete grain size range. The comparison between the measured and
calculated thermal conductivity values enabled an investigation with
respect to the validity of the different Kersten equations. In the
course of this comparison, the influence of effective bulk density was
taken into account. In conclusion, both Kersten formulas should be used
as recommended and regular bulk density corresponded better to the
reference dataset representing the outcomes of the TK04 laboratory
measurement. Another objective was to visualize the relation of thermal
conductivities within their corresponding textural classes and the
validity of Kersten formulas for various bulk densities, depths, and
soils. As a result, the accessibility to information for expedient
recommendations about the feasibility of very shallow geothermal systems
will be improved. Easy, accessible know-how of the fundamentals is
important for a growing renewable energy sector where very shallow
geothermal installations can also cover heating and cooling demands.


FAU Authors / FAU Editors

Bertermann, David Dr.
Lehrstuhl für Geologie (Exogene Dynamik)
Freitag, Simon
Lehrstuhl für Geologie (Exogene Dynamik)
Müller, Johannes
Lehrstuhl für Geologie (Exogene Dynamik)
Schwarz, Hans
Lehrstuhl für Geologie (Exogene Dynamik)


Additional Organisation
Lehrstuhl für Geologie (Exogene Dynamik)


How to cite

APA:
Bertermann, D., Müller, J., Freitag, S., & Schwarz, H. (2018). Comparison between Measured and Calculated Thermal Conductivities within Different Grain Size Classes and Their Related Depth Ranges. Soil Systems, 2. https://dx.doi.org/10.3390/soilsystems2030050

MLA:
Bertermann, David, et al. "Comparison between Measured and Calculated Thermal Conductivities within Different Grain Size Classes and Their Related Depth Ranges." Soil Systems 2 (2018).

BibTeX: 

Last updated on 2018-04-09 at 13:38