A new approach to estimating temperature fields around a group of vertical ground heat exchangers in two-dimensional analyses

Sailer, E.; Taborda, David M.G.; Zdravković, Lidija

doi:10.1016/j.renene.2017.11.035

Cited by 12 publications

(8 citation statements)

References 20 publications

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“…One year of operation was simulated, with balanced heat extraction and injection, each over a period of six months. An appropriate equivalent heat load to account for the two-dimensional nature of the analyses was applied and results with the correction factor * proposed by [16] are compared to those obtained with the conventional approach whereby the heat flux is simply divided by the out-of-plane spacing between VHEs. The use of the correction factor * was deemed fundamental in the performed analyses since [16] showed that its use leads to a more accurate estimate of the temperature field in 2D plane strain analyses.…”

Section: Resultsmentioning

confidence: 99%

“…[15]). Due to the twodimensional (2D) nature of the analysis, an equivalent heat flux, 2 , was applied following the procedure outlined by [16]:…”

Section: Vertical Heat Exchangersmentioning

confidence: 99%

“…Thus, * is generally less than 1.0, providing therefore a reduction in the heat flux applied in 2D analyses and improving noticeably the prediction of temperature changes, especially for small groups of VHEs (i.e. small ), with small spacing ( ) and short length ( ) [16].…”

Section: Vertical Heat Exchangersmentioning

confidence: 99%

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Assessing the impact of vertical heat exchangers on the response of a retaining wall

et al. 2019

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Shallow geothermal energy systems, e.g. borehole heat exchangers or thermo-active structures, provide sustainable space heating and cooling by exchanging heat with the ground. When installed within densely built urban environments, the thermo-hydro-mechanical (THM) interactions occurring due to changes in ground temperature, such as soil deformation and development of excess pore water pressures, may affect the mechanical behaviour of adjacent underground structures. This paper investigates the effects of vertical heat exchangers installed near a deep basement by performing fully coupled THM finite element analyses using the Imperial College Finite Element Program. Different heat exchanger configurations are considered and their influence on the response of the basement wall is assessed in two-dimensional plane strain analyses, where different methods of modelling the heat sources in this type of analysis are employed to evaluate their effect on the temperature field and the non-isothermal soil response.

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Section: Resultsmentioning

confidence: 99%

“…[15]). Due to the twodimensional (2D) nature of the analysis, an equivalent heat flux, 2 , was applied following the procedure outlined by [16]:…”

Section: Vertical Heat Exchangersmentioning

confidence: 99%

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Assessing the impact of vertical heat exchangers on the response of a retaining wall

et al. 2019

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“…In this context, out of plane effects due to heat transfer, mass transfer and deformation phenomena are not considered. Although such approximation may be regarded as noteworthy [127], mathematical formulations allowing to correct the results of these numerical investigations have been presented for both energy piles [128] and energy walls [129].…”

Section: Reduction Of Problem Dimensionsmentioning

confidence: 99%

Energy geostructures: Theory and application

Loria

2020

E3S Web Conf.

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The subsurface represents space and resource of ever-growing importance to meet human activity needs associated with the availability of built environments and energy. So-called energy geostructures represent a breakthrough technology in this context. By integrating the structural support role of earth-contact structures with the heating-cooling role of shallow geothermal heat exchangers, energy geostructures can sustain or enclose built environments while providing them with renewable thermal energy. Despite such promising features, the integrated roles of energy geostructures pose various challenges to understand their behavior and performance, and to address the related analysis and design. Appropriate formulation and application of scientific theory are crucial for the successful analysis and design of energy geostructures. This Bright Spark Lecture Paper presents selected theory for addressing the behavior and performance of energy geostructures, and discusses the application of this theory to analysis and design. In this context, the work focuses on energy piles and barrettes, energy tunnels, as well as energy walls and slabs. The ultimate goal of this paper is to provide competence for facilitating future research and development of energy geostructures across science and engineering.

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“…Therefore, it is advantageous to calculate the lower parameters of the heat source as accurately as possible. There are many attempts to solve this problem in an analytical way and with the help of computer simulations [12][13][14][15][16][17][18][19][20][21][22][23][24], but so far there is no universal formula. Real measurement results are required for calculations and simulations.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests

Piotrowska-Woroniak

2021

Energies

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On the basis of experimental studies, the operational power of four borehole heat exchangers (BHE) under real conditions was determined. The research was carried out in 2018–2019. The theoretical power of the BHE was verified with its operating power. The amount of thermal energy absorbed from the ground by individual BHEs, the operating temperatures obtained at the inlet and outlet of the exchanger, the annual brine flow rate, and the average operating power of the tested wells in two heating seasons were compared and analyzed. Both in 2018 and 2019, none of the examined exchangers achieved an average unit capacity of a well. The aim of the work is to verify the specific ground thermal efficiency indicators adopted for the design of the lower heat source, determined using the computational method and the TRT test with data obtained on the basis of experimental tests. The differences between the results of the tests of the operating parameters of the analyzed BHEs were shown. The data obtained in real conditions is valuable in the research and development of the BHE system.

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A new approach to estimating temperature fields around a group of vertical ground heat exchangers in two-dimensional analyses

Cited by 12 publications

References 20 publications

Assessing the impact of vertical heat exchangers on the response of a retaining wall

Assessing the impact of vertical heat exchangers on the response of a retaining wall

Energy geostructures: Theory and application

Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests

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