Determining optimal designs for conventional and geothermal energy piles

Jelušič, Primož; Žlender, Bojan

doi:10.1016/j.renene.2018.08.016

Cited by 19 publications

(13 citation statements)

References 17 publications

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“…Piles for geothermal energy must be able to bear the applied structural load (Jelušič and Žlender, 2020). This load transfer of the structural load to the ground takes place through friction between the ground and the surface of the pile and by end bearing.…”

Section: Geotechnical Constrainsmentioning

confidence: 99%

3rd International Conference on Technologies & Business Models for Circular Economy: Conference Proceedings

2022

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In recent years great attention has been placed by the building sector on alkali-activated technology based on metakaolin, fly ash and ground granulated blast furnace slag (GGBFS), but also on emerging precursors such as by-products from non-ferrous metallurgy. The present work focuses on the development of alkali-activated binders from two slags, one from primary and one from secondary copper production, which were finely milled, blended with GGBFS, and activated with K-based alkali silicate solution with a 1.7 SiO2/K2O molar ratio. The aggregate to paste mass ratio was 2. The mixtures were cast, and cured for a designated time at room temperature and 60% RH. The so-obtained paving blocks were then tested in accordance with European standard for concrete paving blocks. The following properties were measured: splitting tensile strength, abrasion resistance, slip and skid resistance, resistance to freeze-thaw and resistance to freeze-thaw in the presence of de-icing salts. Their properties were compared to those of commercially available concrete paving blocks, and it was found that the performance of the alkali-activated pavers was generally comparable with the concrete pavers, while certain properties (e.g., abrasion resistance, freeze-thaw resistance and freeze-thaw resistance in presence of de-icing salts) were considerably better. 2 3 RD INTERNATIONAL CONFERENCE ON TECHNOLOGIES & BUSINESS MODELS FOR CIRCULAR ECONOMY: CONFERENCE PROCEEDINGS.

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Section: Geotechnical Constrainsmentioning

confidence: 99%

3rd International Conference on Technologies & Business Models for Circular Economy: Conference Proceedings

2022

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“…The design parameters used in the reviewed studies to optimize the vertical heat exchangers have thermal effects, not structural parameters (Table 8). Jelušič and Žlender [147] fill this gap in their new study to optimize the cost of energy piles. The vertical loads, the number of reinforcing steel bars, and the young soil modulus are the decision variables studied.…”

Section: Decision Variablesmentioning

confidence: 99%

“…However, unlike boreholes, energy piles are primarily designed to meet structural purposes and, therefore, parametric optimization must be controlled to avoid exceeding the limits of the structure. The stresses, strains, and the displacement of the pile should be below the allowable limits to avoid system failure resulting from temperature changes [91,147]. Determining the pile end conditions that can be unrestrained, fully restrained, or partially restrained also plays an essential role in the evolution of the foundation constraints.…”

Section: Constraintsmentioning

confidence: 99%

A review on energy piles design, evaluation, and optimization

Mohamad

Fardoun

Meftah

2021

Journal of Cleaner Production

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Alberdi-Pagola et al [5] verified and optimized an actual energy pile foundation in Denmark through multiple pile g-functions and optimization algorithms, reducing the number of energy piles required by 32.4%. Jelušič and Žlender [6] proposed optimal design suggestions for conventional and geothermal energy piles through a comparative analysis of conventional and geothermal energy piles optimized based on mixed integer and nonlinear programming (MINLP). Some scholars have proposed calculation methods for different numerical model parameters to optimize the accuracy of energy piles in numerical simulations [7,8].…”

Section: Introductionmentioning

confidence: 99%

Simulation and Analysis of the Thermal-Mechanical Response of an Energy Pile

Zhang

Liu

et al. 2022

Lithosphere

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An energy pile undertakes the functions of supporting the superstructure and controlling the indoor temperature of the building, and the thermal-mechanical coupling response of an energy pile makes its load transfer mechanism different from that of conventional engineering piles. Moreover, the thermal-mechanical coupling responses of the energy piles in summer and winter conditions are also different and need to be explored separately. Based on a ground source heat pump pile foundation workshop project in Kunshan city, Jiangsu Province, a multiphysics simulation study was carried out. The simulation results of the outlet water temperature and pile settlement are consistent with the real-world measurements, which verifies the reliability of the numerical simulation. The responses of the temperature distribution, axial stress, lateral shear stress, and settlement of the energy pile in summer and winter were analyzed, and the response laws of the energy pile in different seasons were obtained. Compared with the pure conventional load state, under the effect of thermal-mechanical coupling in winter conditions, the maximum compressive stress of the pile body is reduced by about 11.5%, but the settlement of the pile top increases by about 47.66%. Therefore, the winter conditions should be used as the design energy for the normal use of the pile. The control condition of the limit state: compared with the pure conventional load state, the maximum compressive stress of the pile increases by about 12% and the settlement of the pile top decreases by about 7.23% under the thermal-mechanical coupling effect of the summer condition. Therefore, the summer condition is the pile control conditions for the limit state of the body’s carrying capacity.

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Determining optimal designs for conventional and geothermal energy piles

Cited by 19 publications

References 17 publications

3rd International Conference on Technologies & Business Models for Circular Economy: Conference Proceedings

3rd International Conference on Technologies & Business Models for Circular Economy: Conference Proceedings

A review on energy piles design, evaluation, and optimization

Simulation and Analysis of the Thermal-Mechanical Response of an Energy Pile

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