Influence on thermal response test by groundwater flow in vertical fractures in hard rock

Gehlin, Signild; Hellström, Göran

doi:10.1016/s0960-1481(03)00128-9

Cited by 113 publications

(51 citation statements)

References 2 publications

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“…This is because longer test durations allow borehole heat transfer to reach quasi-steady state, while simultaneously reducing statistical errors due to power and thermal fluctuations. The American Society of Heating, Refrigerating and Air-Conditioning Engineers [117] h. However, in References [139,140], minimum test durations of 50 and 60 h were emphasised, respectively. Long-duration thermal response tests (>100 h) were performed in References [120,129] to study the effects of different test lengths on the estimated properties.…”

Section: Distributed and Enhanced Thermal Response Testingmentioning

confidence: 99%

“…One factor of scale which will always results in higher values of effective thermal conductivity is the presence of advecting groundwater (e.g., [140]Reference [170], where 57 boreholes were tested in situ and compared the results of laboratory tests on 1398 rock core samples. They found that those geological formations which were known to be karstic, highly fractured, or porous and were thus associated with regional flow conditions, were also the formations where there was the biggest difference between laboratory and field scale thermal conductivity values.…”

Section: Groundwater Effectsmentioning

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: Distributed and Enhanced Thermal Response Testingmentioning

confidence: 99%

Section: Groundwater Effectsmentioning

confidence: 99%

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

et al. 2017

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“…Moreover, groundwater can introduce significant nonlinearities in the measured temperatures which cannot be interpreted accurately with a simplified model based on an infinite line source. It must be emphasized that while previous modeling studies have already investigated the effect of groundwater [19,43,44], none of these studies could fully exploit the features of a complex hydrological model, such as HYDRUS, which can give a comprehensive description of a variety of subsurface physical processes. The proposed modeling framework has been used to investigate the influence of groundwater on the borehole heat exchanger.…”

Section: Groundwater Effectsmentioning

confidence: 99%

A computationally efficient pseudo-3D model for the numerical analysis of borehole heat exchangers

Brunetti

Saito

et al. 2017

Applied Energy

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“…Similar to the models discussed in the previous sections, here as well, the objective is to evaluate the temperature response in the soil surrounding GHEs. The effect of ground water is analyzed using numerical [26,[64][65][66] and analytical approaches [63,67].…”

Section: Other Modeling Aspectsmentioning

confidence: 99%

A Review of the Modelling of Thermally Interacting Multiple Boreholes

Koohi-Fayegh

Rosen

2013

Sustainability

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Much attention is now focused on utilizing ground heat pumps for heating and cooling buildings, as well as water heating, refrigeration and other thermal tasks. Modeling such systems is important for understanding, designing and optimizing their performance and characteristics. Several heat transfer models exist for ground heat exchangers. In this review article, challenges of modelling heat transfer in vertical heat exchangers are described, some analytical and numerical models are reviewed and compared, recent related developments are described and the importance of modelling these systems is discussed from a variety of aspects, such as sustainability of geothermal systems or their potential impacts on the ecosystems nearby.

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Influence on thermal response test by groundwater flow in vertical fractures in hard rock

Cited by 113 publications

References 2 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

A computationally efficient pseudo-3D model for the numerical analysis of borehole heat exchangers

A Review of the Modelling of Thermally Interacting Multiple Boreholes

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