Influence of Different Ground Thermal Properties in a Borehole Heat Exchangerï¿½s Performance Using the B2g Dynamic Model

Cazorla-Marín, Antonio; Montagud, Carla; Montero, Álvaro; Martos, Julio; Corberán, José M.

doi:10.22488/okstate.17.000501

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…𝑅 𝑝𝑝 = 𝑊 − 𝐷 𝑝,𝑒 𝐷 𝑝,𝑒 𝑑𝑧 𝑘 𝑏 (29) • The thermal resistance between the two grout nodes (𝑅 𝑏𝑏 ) is estimated as a one-dimensional heat transfer, as represented in the (30).…”

Section: Acknowledgements 102 Radial Thermal Resistancesmentioning

confidence: 99%

“…The B2G model was previously used as a parameter estimation tool in [30] where a very preliminary version of the model (only one ground node that was experimentally adjusted) for single U BHEs was used to estimate the effective ground thermal conductivity using data from the first 15 hours of a standard TRT. The BHE was located at the Universitat Politècnica de València campus in Valencia (Spain).…”

Section: Introductionmentioning

confidence: 99%

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A TRNSYS assisting tool for the estimation of ground thermal properties applied to TRT (thermal response test) data: B2G model

Cazorla-Marín

Montagud

Corberán

et al. 2021

Applied Thermal Engineering

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Section: Acknowledgements 102 Radial Thermal Resistancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A TRNSYS assisting tool for the estimation of ground thermal properties applied to TRT (thermal response test) data: B2G model

Cazorla-Marín

Montagud

Corberán

et al. 2021

Applied Thermal Engineering

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“…Double U-tube and coaxial model configurations have been developed and validated against finite element numerical solutions [45]. Other authors have also added additional resistance-capacitance elements with the TRC model to improve the short-term transient behavior of the models [33,34,46,47].…”

Section: Thermal Resistance-capacitance Modelsmentioning

confidence: 99%

An Enhanced Vertical Ground Heat Exchanger Model for Whole-Building Energy Simulation

Mitchell

Spitler

2020

Energies

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This paper presents an enhanced vertical ground heat exchanger (GHE) model for whole-building energy simulation (WBES). WBES programs generally have computational constraints that affect the development and implementation of component simulation sub-models. WBES programs require models that execute quickly and efficiently due to how the programs are utilized by design engineers. WBES programs also require models to be formulated so their performance can be determined from boundary conditions set by upstream components and environmental conditions. The GHE model developed during this work utilizes an existing response factor model and extends its capabilities to accurately and robustly simulate at timesteps that are shorter than the GHE transit time. This was accomplished by developing a simplified dynamic borehole model and then exercising that model to generate exiting fluid temperature response factors. This approach blends numerical and analytical modeling methods. The existing response factor models are then extended to incorporate the exiting fluid temperature response factor to provide a better estimate of the GHE exiting fluid temperature at short simulation timesteps.

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“…The experimental thermal response test (TRT) data and finite length line source model results were analysed by the different geological characteristics validating the temperature profiles. The Borehole-to-Ground dynamic model was developed and validated by Cazorla-Marín et al (2017) considering the heterogeneous borehole surrounding of different ground materials. The groundwater level changes should be taken into account in BHE's design study as stated by Luo et al (2018).…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of vertical borehole heat exchangers performance under Lithuanian Quaternary conditions

Indriulionis¹,

Palaitis²,

Šinkūnas³

et al. 2019

Baltica

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The vertical borehole heat exchangers were surrounded by the heterogeneous multilayered geological environment and groundwater flow that affected the performance of borehole plants. In this paper, the field investigation of vertical borehole ground heat exchangers in capital city Vilnius (Visoriai), Lithuania is presented. The numerical heat transfer model considering seven different geological strata was developed using the cylindrical heat sink model for vertical borehole inside by solving the soil mass and heat transfer equations with groundwater flow. The numerical multilayered ground vertical borehole heat transfer model was calculated and validated by in-situ thermal response test data. The numerical model results were also compared with the homogeneous finite difference model expressed by the temperature response functions (well known as “g-functions”). The practical realization of g-functions was designed in the Earth Energy Designer as a practical tool for geoengineers designing the vertical borehole plants. The temperature profiles at borehole wall at different heating times were presented and explored together with relative errors. The numerical model will be used as a practical tool for the Lithuanian Geological Survey under the Ministry of Environment to estimate the underground conditions for the consumption of shallow geothermal energy.

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Influence of Different Ground Thermal Properties in a Borehole Heat Exchangerï¿½s Performance Using the B2g Dynamic Model

Abstract: Ground source heat pump (GSHP) systems for heating and cooling represent an efficient alternative to conventional air

Cited by 3 publications

References 8 publications

A TRNSYS assisting tool for the estimation of ground thermal properties applied to TRT (thermal response test) data: B2G model

A TRNSYS assisting tool for the estimation of ground thermal properties applied to TRT (thermal response test) data: B2G model

An Enhanced Vertical Ground Heat Exchanger Model for Whole-Building Energy Simulation

Numerical modelling of vertical borehole heat exchangers performance under Lithuanian Quaternary conditions

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