Influence of regional groundwater flow on ground temperature around heat extraction boreholes

Scorpo, Alberto Liuzzo; Nordell, Bo; Gehlin, Signhild

doi:10.1016/j.geothermics.2015.04.002

Cited by 39 publications

(19 citation statements)

References 11 publications

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“…10. In particular, the upper and lower figures show the effects of groundwater fluxes (0.0, 2.5 · 10 −6 , and 5 · 10 −6 m/s) and aquifer thicknesses (10,20, and 30 m), respectively. At the first inspection, it is evident that both aquifer thicknesses and groundwater fluxes are negatively correlated with the outlet temperatures of the fluid, indicating an increased heat dissipation in soil.…”

Section: Groundwater Effectsmentioning

confidence: 99%

“…Multiple studies have investigated the effect of groundwater flow on borehole heat exchangers (BHE). For example, Liuzzo-Scorpo et al [10] demonstrated that even very low groundwater flow rates can significantly reduce the Influence Length of the exchanger. In another study, Wang et al [11] conducted a thermal performance experiment of a BHE under groundwater flow in China and showed that the presence of groundwater flow enhanced the thermal performance of the borehole heat exchanger and influenced the temperature profile in the aquifer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Groundwater Effectsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…The mathematical and numerical models used are described in Liuzzo‐Scorpo et al (). In the current work, a different analysis of the data presented also in Liuzzo‐Scorpo et al () is carried out, investigating the possibility to estimate the hydraulic conductivity of the aquifer starting from a TRT analysis.…”

Section: Approachmentioning

confidence: 99%

“…All computations are carried out in a mesh encompassing 1.26 × 10 6 quadrilateral and 1.48 × 10 4 triangular (total of 1.28 × 10 6 ) fifth order Lagrange elements. The same model is already used, and then validated, by Liuzzo‐Scorpo et al ().…”

Section: Approachmentioning

confidence: 99%

A Method to Estimate the Hydraulic Conductivity of the Ground by TRT Analysis

Scorpo

Nordell

Gehlin³

2016

Groundwater

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The knowledge of hydraulic properties of aquifers is important in many engineering applications. Careful design of ground-coupled heat exchangers requires that the hydraulic characteristics and thermal properties of the aquifer must be well understood. Knowledge of groundwater flow rate and aquifer thermal properties is the basis for proper design of such plants. Different methods have been developed in order to estimate hydraulic conductivity by evaluating the transport of various tracers (chemical, heat etc.); thermal response testing (TRT) is a specific type of heat tracer that allows including the hydraulic properties in an effective thermal conductivity value. Starting from these considerations, an expeditious, graphical method was proposed to estimate the hydraulic conductivity of the aquifer, using TRT data and plausible assumption. Suggested method, which is not yet verified or proven to be reliable, should be encouraging further studies and development in this direction.

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“…The results of the simulations [8] proved, a that relatively low flow rate may significantly increase the heat transfer. In the article [9] the TRT simulation had been performed using two-dimensional models of the borehole and the ground. The tests had been simulated using various values of the U coefficient (characterizing the flow rate of the ground water, expressed in m/s).…”

Section: Introductionmentioning

confidence: 99%

The analysis of the differences between the results of the thermal response test and the data from the operation of the brine-to-water heat pump’s vertical exchanger

et al. 2017

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Abstract. The article discusses the principles and the problems of obtaining an accurate data input for the design of brine-to-water heat pump's vertical exchangers. Currently, the most accurate method is the thermal response test (TRT). Unfortunately, the test procedure has its limitations and the quality of the results depends on many factors that cannot be fully controlled during the test. As an illustration of the problems, the results of the TRT were presented. The test was executed on the vertical boreholes (one actively regenerated and one not actively regenerated during the summer) which are parts of the operating heat pump system. The test results were compared to the data from the device's operation, in particular with the measurements of the undisturbed ground temperature profiles and the actual unit energy gains from the boreholes. The level of difference between the results of the test and the data from the operation of the boreholes under the real load and the threats concerning the boreholes overload were shown. Additionally the performance differences between the actively regenerated and not actively regenerated boreholes have been emphasised.

show abstract

Influence of regional groundwater flow on ground temperature around heat extraction boreholes

Cited by 39 publications

References 11 publications

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

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

A Method to Estimate the Hydraulic Conductivity of the Ground by TRT Analysis

The analysis of the differences between the results of the thermal response test and the data from the operation of the brine-to-water heat pump’s vertical exchanger

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