Thermal and hydrogeological aquifers characterization by coupling depth-resolved thermal response test with moving line source analysis

Antelmi, Matteo; Alberti, Luca; Angelotti, Adriana; Curnis, Sara; Zille, Andrea; Colombo, L.

doi:10.1016/j.enconman.2020.113400

Cited by 20 publications

(19 citation statements)

References 54 publications

(80 reference statements)

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“…The advantage is to estimate the contribution of different GSHP systems in total aquifer thermal perturbation, which is worthy of further study (Antelmi et al, 2021). In addition, the heat transport mechanisms in the quantification of shallow geothermal resources (Alcaraz et al, 2016), the grouting material on borehole heat exchanger's performance in aquifers (Alberti et al, 2017), and the thermal response test with moving line sources (Antelmi et al, 2020) have been conducted relevant research.…”

Section: Introductionmentioning

confidence: 99%

Geothermal dynamic constraints of groundwater source heat pump system in shallow aquifers

et al. 2023

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Due to the temperature of shallow aquifers being affected by atmospheric temperature, groundwater source heat pumps (GWSHPs) become unstable and the operation efficiency of GWSHP is constrained. In the study, the coupling numerical simulation model of the groundwater flow field and temperature field is established based on the continuous monitoring results in an actual experimental site, and the water and thermal migration of shallow aquifer is simulated under the influence of the atmospheric environment. The influence of the dynamic change in ground temperature is analyzed on a GWSHP. The results indicated that the temperature of the shallow aquifer is affected by the external temperature, and the recharge temperature in the summer cooling period was 33°C, and that in the winter heating period was 6°C in the actual site, to avoid the occurrence of thermal penetration when there is a gap between the actual situation and the design situation, the single cooler can balance the insufficient cooling capacity in summer under the most unfavorable situation. The research results can also provide a reference for the development and utilization of geothermal energy resources in shallow aquifers.

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Section: Introductionmentioning

confidence: 99%

Geothermal dynamic constraints of groundwater source heat pump system in shallow aquifers

et al. 2023

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“…Indeed, research illustrating how groundwater flow can influence mean fluid temperatures (Chiasson et al, 2000), thermal performances (Fan et al, 2007;Zanchini et al, 2012;Nguyen et al, 2017), geometrical layouts (Choi et al, 2013) or operation costs (Capozza et al, 2013;Samson et al, 2018) of these systems are numerous. The result of thermal response tests being also impacted by the advection of groundwater (Signorelli et al, 2007;Chiasson and O'Connell, 2011;Angelotti et al, 2014), much work has been devoted to parameters identification with various interpretation models (Raymond et al, 2011;Wagner et al, 2013;Antelmi et al, 2020;Magraner et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Analytic expressions for the moving infinite line source model

Pasquier¹,

Lamarche²

2022

Preprint

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Groundwater flow can have a significant impact on the thermal response of ground heat exchangers. The moving infinite line source model is thus widely used in practice as it considers both conductive and advective heat transfert processes. Solution of this model involves a relatively heavy numerical quadrature. Contrarily to the infinite line source model, there is currently no known first-order approximation that could be useful for many practical applications. In this paper, known analytical expressions of the Hantush well function and generalized incomplete gamma function are first revisited. A clear link between these functions and the moving infinite line source model is then established. Then, two new exact and integral-free analytical expressions are proposed, along with two new first-order approximations. The new analytical expressions proposed take the form of convergent power series involving no recursive evaluations. It is shown that relative errors less than 1% can be obtained with only a few summands. The convergence properties of the series, their accuracy and the validity domain of the first-order approximations are also presented and discussed.

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“…Several studies investigated analytical models, which consider both conductive and advective heat transport in the subsurface for configuring BHEs [7,16,[24][25][26][27][28][29][30][31][32][33][34][35]. For instance, Claesson et al [27] introduced a groundwater g-function, which is used to reduce the values computed by a g-function for heat conduction.…”

Section: Introductionmentioning

confidence: 99%

“…Previous investigations dealing with the use of the MLS to determine the temperature change in the subsurface, e.g., [16,25,26,29,32,38,39], mostly neglect the effect of an impermeable, grouted borehole. Instead, the BHE is treated as a linear source surrounded by homogeneous ground with constant horizontal groundwater flow velocity.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Steady-State Solution of the Infinite Moving Line Source Model for the Thermal Design of Grouted Borehole Heat Exchangers with Groundwater Advection

2021

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The objective of this study is to assess the suitability of the analytical infinite moving line source (MLS) model in determining the temperature of vertical grouted borehole heat exchangers (BHEs) for steady-state conditions when horizontal groundwater advection is present. Therefore, a numerical model of a grouted borehole is used as a virtual reality for further analysis. As a result of the first analysis, it has been discovered that established analytical methods to determine the borehole thermal resistance as a mean value over the borehole radius can also be applied to BHEs with groundwater advection. Furthermore, the deviation between a finite MLS and the infinite MLS is found to be only less than 5% for BHEs of a depth of 30 m or more, and Péclet numbers greater than 0.05. Finally, the accuracy of the temperature change calculated with the infinite MLS model at the radius of the borehole wall compared to the temperature change at a numerically simulated grouted borehole is addressed. A discrepancy of the g-functions resulting in a poor dimensioning of BHEs by the infinite MLS model is revealed, which is ascribed to the impermeable grouting material of the numerical model. A correction function has been developed and applied to the infinite MLS model for steady-state conditions to overcome this discrepancy and to avoid poor dimensioning of BHEs.

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Thermal and hydrogeological aquifers characterization by coupling depth-resolved thermal response test with moving line source analysis

Cited by 20 publications

References 54 publications

Geothermal dynamic constraints of groundwater source heat pump system in shallow aquifers

Geothermal dynamic constraints of groundwater source heat pump system in shallow aquifers

Analytic expressions for the moving infinite line source model

Enhanced Steady-State Solution of the Infinite Moving Line Source Model for the Thermal Design of Grouted Borehole Heat Exchangers with Groundwater Advection

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