Long-term performance and life cycle assessment of energy piles in three different climatic conditions

Sütman, Melis; Speranza, Gianluca; Ferrari, Alessio; Larrey-Lassalle, Pyrène; Laloui, Lyesse

doi:10.1016/j.renene.2019.07.035

Cited by 58 publications

(19 citation statements)

References 22 publications

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“…As regards initial conditions, the initial temperature in the solid domain was obtained upon running a 'thermal initialization' simulation, i.e. a transient heat conduction simulation (while disabling any fluid movement and convective heat exchange within the pipes) for 180 days, starting from an initial homogeneous temperature condition T0=16 °C, and keeping a constant boundary temperature at the top of the concrete slab (in the absence of the overlying EPS insulating layer) equal to 23°C, representing the average warm-season air temperature in the Italian/Southern European area (e.g., see [44]). Although the real boundary temperature will exhibit natural fluctuations over a 180day period, a fixed average temperature value was chosen (i) for the sake of simplicity and (ii) for ease of comparison between short-and long-term results.…”

Section: Numerical Modelmentioning

confidence: 99%

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Energy performance assessment of thermo-active micro-piles via numerical modeling and statistical analysis

Cecinato

Salciarini

2022

Geomechanics for Energy and the Environment

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Energy micro-piles (EMPs) constitute a promising emerging technology, able to provide both energy and structural retrofitting to existing buildings. Although a number of studies have been published on the energy performance of standard energy piles (EPs), bespoke analysis is required for EMPs due to their different geometry and peculiar design and site constraints. In this work, a parametric study is carried out by means of numerical Finite Element simulations complemented by statistical analysis, aimed at identifying the dominant parameters in maximizing EMP thermal efficiency. Two categories of parameters, namely design-dependent and site-dependent ones, are separately considered to provide guidance for practitioners on both detailed geothermal sizing and overall feasibility assessment. The parameter space is efficiently explored resorting to Taguchi Experimental Design statistical tools. Results show that different design criteria to those for EPs should be used for EMPs. Notably for the latter, contrary to the former, the diameter of heat exchanger pipes emerges as one of the most important factors promoting thermal efficiency, while being the single easiest parameter to engineer. On the other hand, while maximizing the number of U-pipes and pile diameter is crucial for EPs, it does not impact the energy performance of EMPs, due to geometry constraints and the expected occurrence of thermal interferences. Among site-dependent factors, a large ground thermal conductivity is confirmed as an important feature to ensure a high energy performance, while interesting insights are obtained about the role of basement thermal insulation in the long-term EMP thermal output.

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Section: Numerical Modelmentioning

confidence: 99%

“…To allow for such variability, realistic lower and upper bounds for Ta can be set as the minimum and maximum summertime average air temperature at the ground recorded in the Southern European zone (Rome), Ta=15-30 °C (e.g. see [44]).…”

Section: Site Dependent Parametersmentioning

confidence: 99%

Energy performance assessment of thermo-active micro-piles via numerical modeling and statistical analysis

Cecinato

Salciarini

2022

Geomechanics for Energy and the Environment

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“…The numerical simulation compared to a field scale experiment was the most quick and cheap option considering that one year was considered as the minimum period to simulate at the design stage. In recent years, a large number of studies have been published and models of varying complexity have been implemented [14][15][16][17][18][19][20][21].…”

Section: Numerical Simulation Of Hybrid Piles As Heat Exchangers For Gshp Recent Trends In Simulation Of Piles As Heat Exchangersmentioning

confidence: 99%

Hybrid Energy Piles as a Smart and Sustainable Foundation

Russo¹,

Marone²,

Girolamo³

2021

J. Hum. Earth Future

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The disused factories’ areas represent a considerable part of the industrial archaeology of the city of Naples. In the last decades of the previous century, many of these factories were disused also because of the ban of asbestos production by the Italian law 257/1992. Of course, this was not the only problem that concurred to create a large amount of disused industrial areas. Often the simple delocalisation of manufactories in other countries contributed to this problem. The reuse of these areas requires polluted and contaminated land reclamation. The simple removal of the shallow soil layers is a widely used reclamation procedure. Furthermore, drilling operations either for piling or for tunnelling may incur in the same type of problem taking into account that this movement can be very expensive depending on the total volume of soil to be removed and to be taken to disposal. In this study a hybrid pile type is proposed as an environmentally friendly and a cheap solution. Hybrid piles are installed by a combination of pushing and augering technique. This installation method allows avoiding the removal and the subsequent disposal of shallow contaminated soil. The mechanical behaviour of three hybrid piles equipped with strain gauges along the shaft is investigated via three loading tests. In the framework of the design of a new mall in a disused industrial area, the opportunity to provide a fully sustainable foundation solution by equipping the piles with heat exchangers pipes is also investigated. Numerical simulations of the energy hybrid pile behaviour are presented outlining further benefits of the new hybrid installation technique and comparing two different configuration of the heat exchanger pipes. Doi: 10.28991/HEF-2021-02-03-010 Full Text: PDF

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“…In addition to the development of new design concepts through cutting-edge research, TERRE has worked towards the development of tools for industrial applications as there are relatively few tools available in the geotechnical engineering industry for carbon-driven design at present. Tools have included new techniques for geoinfrastructure design incorporating optimisation for minimum energy/carbon [26,27], a Decision Support System for geo-infrastructure carbon-driven project appraisal [28], and method for carbon footprint assessment of geotechnical construction [29].…”

Section: Operational Toolsmentioning

confidence: 99%

TERRE project: interplay between unsaturated soil mechanics and low-carbon geotechnical engineering

et al. 2020

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The geotechnical construction industry is a major component of the overall construction sector and is strategically important in infrastructure development (transportation, flood and landslide protection, building foundations, waste disposal). Although industry and research in the overall construction sector have been investing significantly in recent years to produce innovative low-carbon technologies, little innovation has been created in geotechnical construction industry, which is lagging behind other construction industry sectors. This paper discusses the interplay between low-carbon geotechnical engineering and unsaturated soil mechanics based on the research carried out within the project TERRE (Marie Skłodowska-Curie Innovative Training Networks funded by the European Commission, 2015-2019,H2020-MSCA-ITN-2015-675762).

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Long-term performance and life cycle assessment of energy piles in three different climatic conditions

Cited by 58 publications

References 22 publications

Energy performance assessment of thermo-active micro-piles via numerical modeling and statistical analysis

Energy performance assessment of thermo-active micro-piles via numerical modeling and statistical analysis

Hybrid Energy Piles as a Smart and Sustainable Foundation

TERRE project: interplay between unsaturated soil mechanics and low-carbon geotechnical engineering

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