Examples of the assessment of temperatures on the surface of solid ground in the design of the shallow geothermal energy extractions

Rajver, Dušan; Pestotnik, Simona; Prestor, Joerg

doi:10.5474/geologija.2019.005

Cited by 1 publication

(1 citation statement)

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“…undisturbed ground temperature profile, which varies in the shallower layers due to annual variation of the ground surface temperature, while from about 10 m, is stable throughout the year and increases with depth based on the local geothermal heat f lux. Regarding determination of the annual mean ground temperature, if this cannot be measured it can be assessed using an alternative approach presented by Rajver et al (2019) in four ways according to the available data at a given location.…”

Section: Introductionmentioning

confidence: 99%

Overview of the thermal properties of rocks and sediments in Slovenia

Rajver¹,

Adrinek²

2023

Geologija

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The use of geothermal energy, which comes from both deep geothermal systems and the shallow underground, has been developing rapidly in the last few decades. The purpose of the paper is to present the results of measurements of the thermal properties of all rock samples and sediments that were available from boreholes, two tunnels and numerous surface locations in Slovenia in the period from 1982 to the end of 2022. In relation to the shallow geothermal potential, a special effort is needed to characterize the thermal properties of the rocks and sediments and to implement thermal energy transfer technology. In this sense, knowledge of the thermal conductivity of rocks and sediments is required to assess the possibility of low-enthalpy heat exchange in a given local area. The largest number of measurements was taken to determine thermal conductivity. Determinations of thermal diffusivity were carried out on a much smaller number of rock and sediment samples, as well as determinations of radiogenic heat production in rocks. The results of thermal conductivity measurements on 430 samples from 119 wells, 20 samples from two tunnels and 156 samples from surface locations are shown. The highest thermal conductivities are shown by samples of dolomite, quartz conglomerate and conglomerate, phyllonite, quartz phyllite and gneiss, while the lowest are measured in sediments such as clay, lignite with clay, peat and dry sand. The determined radioactive heat generation is the lowest for milonitized dolomite and highest for dark grey sandstone with shale clasts. Our results are comparable to those already published worldwide, and they could be the basis for the possible future Slovenian standard for the thermal properties of measured rocks and sediments.

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Section: Introductionmentioning

confidence: 99%