Investigating the thermal performance of energy soldier pile walls

Makasis, Nikolas; Narsilio, Guillermo A.

doi:10.1016/j.gete.2021.100242

Cited by 12 publications

(1 citation statement)

References 33 publications

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“…At the local scale, underground temperature increases due to anthropogenic heat fluxes into the ground are relatively well-established. In particular the effect of GHEs, such as energy piles or tunnels, on their immediate surroundings has been extensively reported [13][14][15]. Similar evidence exists for heated basements and their effects on the surrounding subsurface [16].…”

Section: Introductionmentioning

confidence: 95%

Impact of simplifications on numerical modelling of the shallow subsurface at city-scale and implications for shallow geothermal potential

Makasis

Kreitmair

Bidarmaghz

et al. 2021

Science of The Total Environment

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Section: Introductionmentioning

confidence: 95%

Impact of simplifications on numerical modelling of the shallow subsurface at city-scale and implications for shallow geothermal potential

Makasis

Kreitmair

Bidarmaghz

et al. 2021

Science of The Total Environment

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Mechanical assessment of energy wall in the long term

Dai

Zhang

2022

Acta Geotech.

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Embedded retaining walls equipped with ground heat exchangers is one kind of energy geostructures, harvesting the shallow ground energy for heating and cooling buildings. However, past investigations mainly focus on the thermal assessment of energy walls, but pay limited attention to mechanical wall behavior and associated ground response. At present, there is no standard preliminary code for assessing the long-term mechanical performance of energy walls. In this study, a comprehensive literature review is conducted to summarize the existing studies on the long-term mechanical behavior of both conventional retaining walls and thermo-active ones, respectively. The review identifies three most critical mechanical factors for energy walls (i.e., horizontal wall movement, ground settlement, and basement heave), while their permissible values can be referred to standard preliminary design criteria of conventional retaining walls in the short-term and limited long-term field measurements. For elaborating the application of design criteria, a parametric study is implemented to evaluate the long-term mechanical performance of energy walls in stiff clay under various thermal conditions, including the influence of thermal solicitations, station temperature and asymmetrical operation mode. The vivid assessing results show that the thermal-induced mechanical movements due to geothermal operation may cause unfavorable serviceability issues (e.g., cracks), but are unlikely to bring critical damages to the structural performance. The identified critical mechanical factors and evaluation of thermal influences in this study provide some guidance for the mechanical assessment of long-term energy wall behavior, particularly in the light of limited field measurements and demonstration cases.

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A Thermal Conductivity Model for Deformable and Unsaturated Soils to Assess the Thermal Behaviour of Energy Piles

Bruno,

Najdi,

Balzano

2023

Int. J. of Geosynth. and Ground Eng.

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This paper presents an empirical model that predicts the thermal conductivity of soils by accounting for the effect of both the degree of saturation and void ratio on the heat exchange capacity of shallow geothermal reservoirs. The model is generated by the product of two terms: the former accounts for the effect of void ratio on the dry thermal conductivity, whereas the latter describes the influence of the degree of saturation on the moisture-dependent thermal conductivity. The model is a function of three parameters, which are easy to calibrate based on their physical meaning. Model predictions are validated against five different sets of experimental data from literature by means of two alternative approaches: blind prediction of thermal conductivity measurements not employed during calibration and numerical simulations of thermal tests performed on energy piles. Results show that the proposed model is capable of accurately predicting both the thermal conductivity of deformable unsaturated soils as well as reproducing the thermal behaviour of energy piles.

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Investigating the thermal performance of energy soldier pile walls

Cited by 12 publications

References 33 publications

Impact of simplifications on numerical modelling of the shallow subsurface at city-scale and implications for shallow geothermal potential

Impact of simplifications on numerical modelling of the shallow subsurface at city-scale and implications for shallow geothermal potential

Mechanical assessment of energy wall in the long term

A Thermal Conductivity Model for Deformable and Unsaturated Soils to Assess the Thermal Behaviour of Energy Piles

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