Ground thermal conductivity estimation using the thermal response test with a horizontal ground heat exchanger

Urresta, Esteban; Moya, Marcelo; Campañá, Carlos; Cruz, Carlos

doi:10.1016/j.geothermics.2021.102213

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…The identi ed equation can predict the TC values with 87% accuracy compared to those obtained from laboratory results. Urresta et al [40] evaluated the relationship between the TC and temperature by using thermal response tests with Horizontal Ground Heat Exchangers (HGHEs) and determined the e ciency of the ground TC at shallow depths.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on Thermal Conductivity of Geotextile- Reinforced Soils

Ghazavi,

Ghoreshizadeh

2024

Preprint

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The design of thermally active ground structures such as energy geo-structures and shallow and deep geothermal systems requires knowledge of the thermally geological properties of soils and rocks. Soil thermal conductivity is a critical parameter of geological formation for designing geothermal energy foundations. This paper presents the results of thermal conductivity of soil reinforced with geotextile layers with transient method (needle probe test). Effects of different volumes of soil, sand granulation, geotextiles positions and numbers in soil, various densities, and water contents on thermal conductivity were investigated in detail. The results demonstrated that the thermal conductivity varies with the water content, soil density, different granulation, the number of geotextile layers and their positions in the test cylindrical container, and soil volume. It has been found that thermal conductivity with one geotextile layer at 1/3 of the container bottom with coarse-grained soil at the top and fine-grained at the bottom is minimum. In addition, coarser-grained soils encapsulated between geotextile layers have lower thermal conductivity than the similar case when fine-grained soils are used. Moreover, by increasing the soil mass density and decreasing the void ratio, the thermal conductivity of the soil increases.

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Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on Thermal Conductivity of Geotextile- Reinforced Soils

Ghazavi,

Ghoreshizadeh

2024

Preprint

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“…As an important part of the earth's critical zone, soil layer is a channel that controls the material transformation and energy flow 1 – 3 . In recent years, with the rise of geothermal energy 4 – 6 , understanding the soil thermal conductivity ( λ ) is crucial for designing and optimizing engineering projects 7 , 8 . λ is one of the important parameters describing the thermal properties of soil.…”

Section: Introductionmentioning

confidence: 99%

A new model to predict soil thermal conductivity

Xiong

Feng

Jin

et al. 2023

Sci Rep

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Thermal conductivity is a basic parameter of soil heat transferring, playing an important role in many fields including groundwater withdrawal, ground source heat pump, and heat storage in soils. However, it usually requires a lot of time and efforts to obtain soil thermal conductivity. To conveniently obtain accurate soil thermal conductivity, a new model describes the relationship between soil thermal conductivity (λ) and degree of saturation (Sr) was proposed in this study. Dry soil thermal conductivity (λdry) and saturated soil thermal conductivity (λsat) were described using a linear expression and a geometric mean model, respectively. A quadratic function with one constant was added to calculate λ beyond the lower λdry and upper λsat limit conditions. The proposed model is compared with five other frequently used models and measured data for 51 soil samples ranging from sand to silty clay loam. Results show that the proposed model match the measured data well. The proposed model can be used to determine soil thermal conductivity of a variety of soil textures over a wide range of water content.

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“…Moreover, geothermal power generation can make up for the elevated energy demands of numerous industrial procedures reducing their costs [9]. Heating and cooling buildings using geothermal heat pumps is the most energy-and environmentally efficient system, and the most cost-effective from an economic standpoint [10]. It has been demonstrated that the cost of heating one square meter of space utilizing geothermal systems is less expensive than traditional energy sources [11].…”

Section: Introductionmentioning

confidence: 99%

“…On-site tests, such as the Thermal Response Test (TRT) [35], are a popular tool to measure the ground thermal conductivity in situ. The main drawback is that it is essential to ensure a minimal thermal interference between the surface and the GHE in order to obtain a correct interpretation of long-term results [10], which introduces further complexity to the test. Moreover, laboratory tests have been developed to determine the thermal properties of the soil under controlled scenarios.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of the Thermal Properties of Dry Green Swales to Be Used as Part of Geothermal Energy Systems

Rey-Mahía,

Álvarez-Rabanal,

Sañudo-Fontaneda

2023

Applied Sciences

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Low-enthalpy geothermal systems are a promising source for renewable and clean energy for heating, cooling, and air conditioning residential buildings, contributing to the reduction in greenhouse gas emissions in line with the United Nations’ Sustainable Development Goals. Previous research emerged around the geothermal utilization of Sustainable Drainage Systems (SuDS) as multifunctional surfaces for stormwater control and energy saving, developing the water–energy nexus. However, these studies did not comprehensively considered the energy aspects for SuDS design, using non-standardized tests to measure the main thermal parameters. This research aims to address this gap by proposing a novel hybrid engineering procedure to study the thermal properties of SuDS layers and materials through experimental tests combined with steady-state and transient numerical simulations, using green swales operating under dry and wet conditions as a first case study for SuDS techniques. Novel materials incorporated into dry swales (expanded clay and construction and demolition waste) were tested. The results validated this new methodology, reporting an increase of 87% under dry conditions, and 51% under wet scenarios in the thermal insulation performance in comparison to standard materials. A better thermal performance of the systems can be achieved by approaching SuDS design from a holistic viewpoint that integrates energy aspects.

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Ground thermal conductivity estimation using the thermal response test with a horizontal ground heat exchanger

Cited by 11 publications

References 11 publications

Laboratory Investigation on Thermal Conductivity of Geotextile- Reinforced Soils

Laboratory Investigation on Thermal Conductivity of Geotextile- Reinforced Soils

A new model to predict soil thermal conductivity

Experimental and Numerical Study of the Thermal Properties of Dry Green Swales to Be Used as Part of Geothermal Energy Systems

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