Simulation Model for Thermally Interacting Heat Extraction Boreholes

Eskilson, Per; Claesson, Johan

doi:10.1080/10407788808913609

Cited by 215 publications

(116 citation statements)

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“…Building on the quasi-steady-state modeling (Eskilson 1988) for vertical ground heat exchange, there have been a numerous publications on borehole resistance for a single loop. Previous studies employed finite element numerical techniques (Sharqawy 2009;Sagia 2012;Liao 2012).…”

mentioning

confidence: 99%

Thermal resistance of borehole heat exchangers composed of multiple loops and custom shapes

Koenig

2015

Geotherm Energy

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Background: The thermal resistance of a borehole can be reduced by employing thermally enhanced grout, increasing the surface area of the loop and locating the legs proximal to the bore wall. Thermal models that are used to predict borehole heat exchange are characterized by either simplified formulations that are restrictive in their application, but utilitarian, or complex multi-dimensional analyses that are cumbersome to implement. Methods: The borehole resistance methodology presented here offers a straightforward solution that is built on single loop conduction shape factor analysis with thermal shunt accounting and pipe-pipe configuration analysis, to extend to multi-loop borehole configurations and custom kidney extrusions. Results: The borehole resistance predictions are compared to published data and information listed by manufacturers of multi-loop products in third party thermal tests against standard loops. The results are found to agree within the constraints posed by the model assumptions. The methodology offers a straightforward solution that can be incorporated into popular geothermal loop sizing software such as GLD, GLHEPRO and other system software. Conclusions: The advantages and challenges of these advanced loop designs are discussed and conclusions drawn. By reducing the bore resistance, one can take advantage of less drilling and proportionally less capital cost for the bore field, while achieving the same loop temperatures.

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confidence: 99%

Thermal resistance of borehole heat exchangers composed of multiple loops and custom shapes

Koenig

2015

Geotherm Energy

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“…Based on the finite line source model presented by Eskilson [5], Zeng et al [6] have given an analytical solution by using a constant temperature for the upper boundary. By using the temporal superposition, L. Lamarche [7] developed the finite line source model in Equation (1):…”

Section: Finite Line Source Model (Fls)mentioning

confidence: 99%

“…M et al [4] developed the cylindrical heat source model by using multiple load aggregation algorithms to simulate hourly energy variations. Eskilson [5] proposed a finite line source (FLS) model in the ground [43][44][45]. Recently, a zoning operation strategy, in which only the relatively central part of the GHE runs during the low load season, was adopted by Yu Mingzhi et al [46] to alleviate the thermal accumulation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Thermal Anomalies in Multi-Boreholes Field Considering the Effects of Groundwater Flow

Song

Han

et al. 2016

Sustainability

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Abstract:In this paper, the performance of multiple boreholes (multi-BHEs) field is evaluated by considering the groundwater flow. Optimization strategies are presented to mitigate thermal anomalies in the BHEs field. This study shows that groundwater flow greatly improves the heat transfer but causes thermal anomalies downstream. To overcome this problem, a heat transfer model is established for multi-boreholes based on temperature field superposition and moving finite line source model (MFLS). The MFLS multi-boreholes model considers the axial effect and groundwater flow and produces results in agreement with the field tested data of a 4ˆ4 boreholes field. Using a dynamic annual load pattern, the long-term performance of the 4ˆ4 boreholes field is analyzed. Three dynamic diurnal cooling load models are proposed to evaluate the temperature changes in the underground. The intermittent load model could reduce the local temperature anomalies in downstream tubes. The optimization model for cooling cases for multi-BHEs is elaborated to keep the outlet temperature as low as possible and minimize the extreme temperature anomalies, and by this, ultimately improve the system performance. Furthermore, the temperature variations and thermal anomalies downstream of multi-BHEs are investigated by evaluating the arrangement optimization and load optimization. The results show that the optimization could mitigate thermal anomalies downstream and reduce the rate of temperature imbalance of the BHEs field.

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“…In these methods, usually analytical solutions are combined with the numerical methods or analytical expressions requiring numerical integrations for evaluation of temperature rise and heat flows. Eskilson and Claesson [10] model the interaction between the convective heat flow in a heat exchanger and heat conduction in the soil using a combination of Laplace transforms and the finite difference method. …”

Section: Modeling Ground Heat Exchangersmentioning

confidence: 99%

A Review of the Modelling of Thermally Interacting Multiple Boreholes

Koohi-Fayegh

Rosen

2013

Sustainability

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Much attention is now focused on utilizing ground heat pumps for heating and cooling buildings, as well as water heating, refrigeration and other thermal tasks. Modeling such systems is important for understanding, designing and optimizing their performance and characteristics. Several heat transfer models exist for ground heat exchangers. In this review article, challenges of modelling heat transfer in vertical heat exchangers are described, some analytical and numerical models are reviewed and compared, recent related developments are described and the importance of modelling these systems is discussed from a variety of aspects, such as sustainability of geothermal systems or their potential impacts on the ecosystems nearby.

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Simulation Model for Thermally Interacting Heat Extraction Boreholes

Cited by 215 publications

References 1 publication

Thermal resistance of borehole heat exchangers composed of multiple loops and custom shapes

Thermal resistance of borehole heat exchangers composed of multiple loops and custom shapes

Evaluation of Thermal Anomalies in Multi-Boreholes Field Considering the Effects of Groundwater Flow

A Review of the Modelling of Thermally Interacting Multiple Boreholes

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