Heat transfer analysis of energy piles with parallel U-Tubes

Cui, Ping; Jia, Linrui; Zhou, Xinlei; Yang, W. J.; Zhang, Wenke

doi:10.1016/j.renene.2020.07.149

Cited by 18 publications

(2 citation statements)

References 27 publications

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“…Another study was by Cui et al (2020), who investigated the impact of various design parameters, including the number of heat-exchanging loops, on the heating effectiveness of multiple U-tubes connected in parallel in an energy pile of 1.0 m in diameter [27]. According to the study, using four U-tube loops was found to be the optimum number of loops to have the highest thermal effectiveness.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Alqawasmeh,

Narsilio,

Makasis

2024

Energies

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“…The results of thermal response analysis of the energy pile showed that the operation mode and heat injection rate will affect the temperature change of the soil around the pile, which in turn affects the performance of the system; they also found the number of loops, the location of the pipeline and the concrete, and the thermal conductivity significantly affect the thermal interaction between the water inlet and outlet pipes [28,29]. By establishing the analysis and numerical heat exchange model of the U-shaped tube energy reactor, the Laplace method and superposition principle were used to obtain the analytical solution, and the numerical model and finite element method were used to verify the solution of the heat exchange model [30]. Although much research has been carried out on the heat exchange characteristics of energy piles, due to the complex structural types and various heat exchange media of energy piles, the heat exchange laws of energy piles with different structural types are different.…”

Section: Introductionmentioning

confidence: 99%

Research on Heat Exchange Law and Structural Design Optimization of Deep Buried Pipe Energy Piles

et al. 2021

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A deeply buried pipe energy pile (DBP-EP) combines the advantages of a ground source heat pump (GSHP) and an inside buried pipe energy pile (IBP-EP) and is an efficient, clean, and energy-saving technology. Based on field tests and numerical simulations, this paper explores the temperature distribution and heat exchange effects of DBP-EP under different influencing factors. The results show that when the pile-to-well ratio is approximately 0.3–0.4, the heat exchange of the energy pile obtains the best benefit; the inlet water temperature is the most significant factor affecting the heat exchange effect of the energy pile, and when combined with a reasonable pile-to-well ratio, the energy pile obtains the best heat exchange effect; the flow rate has a significant impact on the heat exchange effect of the energy pile, but needs to be set reasonably according to the pile-to-well ratio; the influence of inlet water temperature, well depth, flow rate, and pile length on the heat exchange efficiency of the energy pile is gradually weakened. The research results of this paper provide a theoretical basis for the structural design optimization of DBP-EP and promote the popularization and application of energy pile technology.

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Effect of operating and geometrical parameters on real-time thermal effectiveness of closed-loop borehole heat exchangers in GSHP application

Kumar,

Murugesan

2023

J Mech Sci Technol

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Heat transfer analysis of energy piles with parallel U-Tubes

Cited by 18 publications

References 27 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

Research on Heat Exchange Law and Structural Design Optimization of Deep Buried Pipe Energy Piles

Effect of operating and geometrical parameters on real-time thermal effectiveness of closed-loop borehole heat exchangers in GSHP application

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