A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields

Monzó, Patricia; Mogensen, Palne; Acuña, José; Ruiz-Calvo, Félix; Montagud, C.

doi:10.1016/j.geothermics.2015.03.003

Cited by 41 publications

(33 citation statements)

References 11 publications

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“…In this paper, the g-function is generated from a FEM (Finite Element Method) model described in [39]. Numerical modeling of multiple borehole fields usually is handicapped with large computing times in comparison with analytical solutions; however, a detailed description of the thermal process is achieved with numerical solutions.…”

Section: G-function Generationmentioning

confidence: 99%

“…Numerical modeling of multiple borehole fields usually is handicapped with large computing times in comparison with analytical solutions; however, a detailed description of the thermal process is achieved with numerical solutions. For the sake of simplicity in the long term analysis and reduction of the computing time, the model presented in [39], which will be referred as the HCM-model, considers the boreholes as cylinder sources which are filled with a highly conductive material (HCM). Moreover, the HCM model takes advantage of the thermal conductivity of the highly conductive material to impose a uniform temperature boundary condition at the borehole wall.…”

Section: G-function Generationmentioning

confidence: 99%

“…The procedure to impose a uniform temperature boundary condition at the borehole walls with the concept of the HCM material is explained briefly below and further details can be found in [39]. In the HCM model, a uniform temperature condition is imposed by physically connecting the boreholes, which are filled with the fictitious HCM, with a bar, made of HCM and placed some centimeters above the ground surface by using auxiliary HC cones.…”

Section: G-function Generationmentioning

confidence: 99%

“…Table 3: Geometrical aspect ratios -UPV site The computational domain, surrounding ground and borehole field, presents a total volume of about 200x200 m in the horizontal plane with 300 m depth, while the borehole field volume is only 1.57x6.15 m with 51 m depth (for the execution of the boreholes, a ditch of 1 m depth was drilled apart from the 50 m depth of the boreholes). The HCM elements, cylinders to fill the boreholes, bar, and auxiliary cones; are then inserted, as explained in [39].…”

Section: G-function Generationmentioning

confidence: 99%

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Coupling short-term (B2G model) and long-term (g-function) models for ground source heat exchanger simulation in TRNSYS. Application in a real installation

Ruiz-Calvo

Роса

Monzó

et al. 2016

Applied Thermal Engineering

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Coupling short-term (B2G model) and long-term (g-function) models for ground source heat exchanger simulation in TRNSYS. Application in a real installation.. Applied Thermal Engineering AbstractGround-source heat pump (GSHP) systems represent one of the most promising techniques for heating and cooling in buildings. These systems use the ground as a heat source/sink, allowing a better efficiency thanks to the low variations of the ground temperature along the seasons. The ground-source heat exchanger (GSHE) then becomes a key component for optimizing the overall performance of the system. Moreover, the short-term response related to the dynamic behaviour of the GSHE is a crucial aspect, especially from a regulation criteria perspective in on/off controlled GSHP systems. In this context, a novel numerical GSHE model has been developed at the Instituto de Ingeniería Energética, Universitat Politècnica de València. Based on the decoupling of the short-term and the longterm response of the GSHE, the novel model allows the use of faster and more precise models on both sides. In particular, the short-term model considered is the B2G model, developed and validated in previous research works conducted at the Instituto de Ingeniería Energética. For the long-term, the g-function model was selected, since it is a previously validated and widely used model, and presents some interesting features that are useful for its combination with the B2G model. The aim of the present paper is to describe the procedure of combining these two models in order to obtain a unique complete GSHE model for both short-and long-term simulation. The resulting model is then validated against experimental data from a real GSHP installation.

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Section: G-function Generationmentioning

confidence: 99%

Section: G-function Generationmentioning

confidence: 99%

Section: G-function Generationmentioning

confidence: 99%

Section: G-function Generationmentioning

confidence: 99%

See 2 more Smart Citations

Coupling short-term (B2G model) and long-term (g-function) models for ground source heat exchanger simulation in TRNSYS. Application in a real installation

Ruiz-Calvo

Роса

Monzó

et al. 2016

Applied Thermal Engineering

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“…A novel approach to numerically model borehole fields using a highly conductive material (HCM) was presented by Monzó et al (2015) and later improved (Monzó, 2018). Other numerical models have been developed but are not discussed here.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Design of a laboratory borehole storage model

Mazzotti¹,

Jiang²,

Monzó³

et al. 2018

Proceedings of the IGSHPA Research Track 2018

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This paper presents the design process of a 4x4 Laboratory Borehole Storage (LABS) model through analytical and numerical analyses. This LABS is intended to generate reference Thermal Response Functions (TRFs) as well as to be a validation tool for borehole heat transfer models. The objective of this design process is to determine suitable geometrical and physical parameters for the LABS. An analytical scaling analysis is first performed and important scaling constraints are derived. In particular, it is shown that the downscaling process leads to significantly higher values for Neumann and convective boundary conditions whereas the Fourier number is invariant. A numerical model is then used to verify the scaling laws, determine the size of the LABS, as well as to evaluate the influence of top surface convection and borehole radius on generated TRFs. An adequate shape for the LABS is found to be a quarter cylinder of radius and height 1.0 m, weighing around 1.2 tonnes. Natural convection on the top boundary proves to have a significant effect on the generated TRF with deviations of at least 15%. This convection effect is proposed as an explanation for the difference observed between experimental and analytical results in Cimmino and Bernier (2015). A numerical reproduction of their test leads to a relative difference of 1.1% at the last reported time. As small borehole radii are challenging to reproduce in a LABS, the effect of the borehole radius on TRFs is investigated. It is found that Eskilson's radius correction (1987) is not fully satisfactory and a new correction method must be undertaken.

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Vertical borehole ground heat exchanger design methods

Spitler¹,

Bernier²

2016

Advances in Ground-Source Heat Pump Systems

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A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields

Abstract: ElsevierMonzó Cárcel, PM.; Mogensen, P.; Acuña, J.; Ruiz Calvo, F.; Montagud Montalvá, CI. (2015). A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields. Geothermics. 56:35-44.

Cited by 41 publications

References 11 publications

Coupling short-term (B2G model) and long-term (g-function) models for ground source heat exchanger simulation in TRNSYS. Application in a real installation

Coupling short-term (B2G model) and long-term (g-function) models for ground source heat exchanger simulation in TRNSYS. Application in a real installation

Design of a laboratory borehole storage model

Vertical borehole ground heat exchanger design methods

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