Influence of groundwater flow on the ground heat exchanger performance and ground temperature distributions: A comprehensive review of analytical, numerical and experimental studies

Jia, G.S.; Ma, Zongyuan; Xia, Zhenhua; Wang, J.W.; Zhang, Y.P.; Jin, Liwen

doi:10.1016/j.geothermics.2021.102342

Cited by 17 publications

(5 citation statements)

References 98 publications

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“…However, groundwater flow has not been reported. Therefore, groundwater flow is not considered in this work, which is a conservative approach as it would enhance the thermal performance of the energy piles [32,37,38].…”

Section: Geological Thermal and Operation Parametersmentioning

confidence: 99%

“…The pile length considered for this site is 40 m, as shallower piles are suitable for in-series interconnections due to the loops requiring sufficient length temperature difference between the inlet and outlet that can run the heat pump effec The layers' thermal properties have been measured under the presence of a water t a depth of 3 m from the surface. However, groundwater flow has not been rep Therefore, groundwater flow is not considered in this work, which is a conservati proach as it would enhance the thermal performance of the energy piles [32,37,38]. In addition to the geology based on the Arden site, a more generalised geo profile is also used as part of the presented analyses, extending the work to cover di influential parameters in heat transfer.…”

Section: Geological Thermal and Operation Parametersmentioning

confidence: 99%

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Impact of Geometrical Misplacement of Heat Exchanger Pipe Parallel Configuration in Energy Piles

Alqawasmeh,

Narsilio,

Makasis

2024

Energies

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Shallow geothermal or ground source heat pump (GSHP) energy systems offer efficient space heating and cooling, reducing greenhouse gas emissions and electrical consumption. Incorporating ground heat exchangers (GHEs) within pile foundations, as part of these GSHP systems, has gained significant attention as it can reduce capital costs. The design and optimisation of GHEs connected in parallel within energy piles have been researched widely, considering symmetrical placement, while the potential misplacement due to construction errors and the optimal placement remain mostly unexplored. This study utilises 3D finite element numerical methods, analysing energy piles with diameters from 0.5 m to 1.4 m, equipped with parallelly connected U-tube and W-tube GHEs. The impact of GHE loop placement is analysed, considering the influence of the ground and concrete thermal conductivities, pile length, fluid flow rate, GHE pipe diameter, and pile spacing. Results indicate a marginal impact, less than 3%, on the overall heat transfer when loops deviate from symmetry and less than 5% on the total heat transfer shared by each loop, except for highly non-symmetric configurations. Symmetrical and evenly spaced loop placement generally maintains favourable thermal performance and ease of installation. This study underscores the flexibility in GHE design and construction with a low risk of thermal yield variations due to uncertainties, particularly with a separation-to-shank distance ratio between 0.5 and 1.5 in a symmetrical distribution.

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Section: Geological Thermal and Operation Parametersmentioning

confidence: 99%

Section: Geological Thermal and Operation Parametersmentioning

confidence: 99%

Impact of Geometrical Misplacement of Heat Exchanger Pipe Parallel Configuration in Energy Piles

Alqawasmeh,

Narsilio,

Makasis

2024

Energies

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“…Zhang [21] and Molina-Giraldo et al [22] studied the effect of simultaneously considering permafrost in the soil, groundwater seepage, and heat transfer through the water pipe of an energy pile and found that increasing the distance between the energy piles reduced the heat transfer effect of the piles but improved year-round performance. Antelmi [23] and Jia et al [24] investigated the effects of groundwater seepage on heat exchange in energy piles and found that flowing groundwater was conducive to soil temperature recovery and the heat exchange of an energy pile.…”

Section: Introductionmentioning

confidence: 99%

“…First, this paper models and validates the energy pile. Then, it intends to simulate the heat transfer process of an SGHPs-P energy pile using Fluent software and mainly focus on the most commonly used helix pitches [10,[12][13][14][15][16][17][18][24][25][26][27][28][29] in engineering applications on the heat transfer of SGHEs-P and to analyze the temperature distribution of the energy pile using the G-function method. Finally, it analyzes the effects of an operation pattern (continuous and intermittent) on the ground temperature and the influence of helix pitch, helix radius, and diameter of the helical tube on the helical tube wall surface convective heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Control Strategies on the Heat Transfer Mechanism of Helical Energy Piles

Wei,

Li,

et al. 2024

Applied Sciences

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In this paper, numerical simulations of a special energy pile, which constitutes a spiral-injected pipe and one straight discharge pile for Geothermal Heat Pump Systems (SGHEs-P(parallel)), were conducted by Fluent software. The effects of the spiral pitches on the heat transfer rate based on the G-function method and peripheral soil temperature of the pile were investigated under continuous and intermittent operation strategies. The impact of spiral tube sizing on the surface heat transfer coefficients was studied. The results indicated that SGHEs-P may be preferred for office buildings under intermittent operation conditions. For a short period, the temperature profiles and heat transfer efficiency of SGHEs-P were mainly influenced by the fluid type, length of the spiral tube, and spiral pitch. The smaller the spiral pitch, the more uniform the temperature distribution, and the better the heat transfer effect, but the heat transfer per unit depth of pile decreased. The average temperature variation curve of the soil around the energy pile with different spiral pitches was simulated and obtained over time. Meanwhile, the impact of spiral radius, spiral pitch, and spiral tube radius on the convective heat transfer coefficient was also presented. Through data fitting, the formulas for the correction coefficients of spiral radius, spiral pitch, and spiral tube radius on convective heat transfer coefficient were obtained, respectively.

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“…t → ∞). These approximate formulae have been successfully applied to hydrological and geothermal studies (Jia et al, 2022;Yeh and Chang, 2013).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of modified Hantush's function

Bandos¹,

Martín-Escudero²,

Sala-Lizarraga³

2023

Preprint

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It is pointed out that Hantush's M function, commonly used in groundwater pumping modeling, is identical to the function known in the problems of heat conduction in the ground. A modified Hantush function E used in the steady-state solutions for heat conduction that take into account advection due to groundwater flow around borehole heat exchangers (BHEs) is introduced. New exact representation and twotypes of approximate expressions for this two-parametric function E are presented: one is suitable for small values of a parameter and the other for its large values.High accuracy of the approximate formulae is verified by comparison with the exact values provided by modified Hantush's function E in those validity domains.These analytical expressions can be used for designing complex borehole configurations and may be potentially useful in steady-state analysis of partially penetrated wells (PPWs) in leaky aquifer.

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Influence of groundwater flow on the ground heat exchanger performance and ground temperature distributions: A comprehensive review of analytical, numerical and experimental studies

Cited by 17 publications

References 98 publications

Impact of Geometrical Misplacement of Heat Exchanger Pipe Parallel Configuration in Energy Piles

Impact of Geometrical Misplacement of Heat Exchanger Pipe Parallel Configuration in Energy Piles

Effect of Different Control Strategies on the Heat Transfer Mechanism of Helical Energy Piles

Evaluation of modified Hantush's function

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