A review on energy piles design, evaluation, and optimization

Mohamad, Zahraa; Fardoun, Farouk; Meftah, Fékri

doi:10.1016/j.jclepro.2021.125802

Cited by 49 publications

(15 citation statements)

References 151 publications

(212 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another possible use of PCMs concerns energy piles technology, where a closed loop consisting of a GHE integrated into the concrete of foundation piles of structures can be exploited [ 140 ]. Although several studies have already analyzed this technology, energy piles still face different critical challenges, such as the effect of temperature variations, due to the GCHP, on the internal stress distribution of the concrete pile or its bearing capacity [ 141 ].…”

Section: Future Challenges: Pcm–ghe Couplingmentioning

confidence: 99%

Phase Change Material Evolution in Thermal Energy Storage Systems for the Building Sector, with a Focus on Ground-Coupled Heat Pumps

et al. 2022

View full text Add to dashboard Cite

The building sector is responsible for a third of the global energy consumption and a quarter of greenhouse gas emissions. Phase change materials (PCMs) have shown high potential for latent thermal energy storage (LTES) through their integration in building materials, with the aim of enhancing the efficient use of energy. Although research on PCMs began decades ago, this technology is still far from being widespread. This work analyses the main contributions to the employment of PCMs in the building sector, to better understand the motivations behind the restricted employment of PCM-based LTES technologies. The main research and review studies are critically discussed, focusing on: strategies used to regulate indoor thermal conditions, the variation of mechanical properties in PCMs-based mortars and cements, and applications with ground-coupled heat pumps. The employment of materials obtained from wastes and natural sources was also taken in account as a possible key to developing composite materials with good performance and sustainability at the same time. As a result, the integration of PCMs in LTES is still in its early stages, but reveals high potential for employment in the building sector, thanks to the continuous design improvement and optimization driven by high-performance materials and a new way of coupling with tailored envelopes.

show abstract

Section: Future Challenges: Pcm–ghe Couplingmentioning

confidence: 99%

Phase Change Material Evolution in Thermal Energy Storage Systems for the Building Sector, with a Focus on Ground-Coupled Heat Pumps

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The heat exchanger tubes installed in energy piles are generally arranged in single U, double U in series, double U in parallel, triple U in parallel, quadruple U in series, and spiral [2], as shown in Figure 2. Different arrange forms have their own characteristics, for example, the single U-shape layout is simple but provides less heat exchange than the complex spiral layout, and different arrange forms are selected according to different use scenarios.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Softening Shear Model of the Energy Pile–Soil Contact Surface

Wang,

Zhao,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

In this paper, a finite element numerical model of thermal-hydro-mechanical of energy piles under multi-layer geological conditions was established, and field tests of ultra-long energy pile (1000-mm-diameter, 44-m-long) were carried out to reveal the temperature distribution and mechanical properties of energy pile under typical working conditions. Based on the analytical results, a softening shear model of the energy–soil interface under the condition of large shear displacement was proposed with the load transfer method, and the reliability of the model was verified. The model can simulate the shear–displacement relationship of the pile–soil interface under different geological conditions.

show abstract

“…From an energy point of view, the basic operational principles of energy piles and other energy geo‐structures are well known, and their adoption has been growing almost exponentially over the last two decades, due to their environmentally friendly features. Several review works on this topic are available in the literature 2–10 …”

Section: Introductionmentioning

confidence: 99%

“…Several review works on this topic are available in the literature. [2][3][4][5][6][7][8][9][10] From the mechanical point of view, energy piles are subjected to cyclic thermally induced internal forces that arise due to the interaction with the surrounding soil, and that add to the mechanical load transferred by the structure. This can significantly change the performance of the soil/foundation system and may have adverse effects on the serviceability of the supported structure.…”

mentioning

confidence: 99%

Numerical analysis of energy piles in a hypoplastic soft clay under cyclic thermal loading

Iodice

Laora

Tamagnini

et al. 2023

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

This work is a numerical investigation of the effect of thermally induced volumetric collapse of normally consolidated clays on the performance of energy piles. A series of coupled thermo-hydro-mechanical Finite Element simulations were carried out using the commercial software ABAQUS. These examined a single free-head energy pile embedded in a normally consolidated clay layer subjected to a constant mechanical load and to a number of heating/cooling cycles, to reproduce operating conditions. The soil behaviour was described with two advanced hypoplastic constitutive models for clays, one of which incorporates the thermally induced volumetric collapse using an ad-hoc algorithm developed by the authors. Both models predict a cyclic accumulation of settlement and excess pore water pressure, especially when the thermal collapse effect is considered. While the excess pore pressure distribution stabilises within a few cycles, the rate of settlement of the pile head does not show any tendency to decrease from one cycle to another. These results are in agreement with data from small scale tests on an isolated energy pile in normally consolidated clay, indicating that the numerical model developed in this study can be used to investigate the complex soil/pile/raft interaction processes occurring in real piled foundations incorporating energy piles.

show abstract

A review on energy piles design, evaluation, and optimization

Cited by 49 publications

References 151 publications

Phase Change Material Evolution in Thermal Energy Storage Systems for the Building Sector, with a Focus on Ground-Coupled Heat Pumps

Phase Change Material Evolution in Thermal Energy Storage Systems for the Building Sector, with a Focus on Ground-Coupled Heat Pumps

A Study on the Softening Shear Model of the Energy Pile–Soil Contact Surface

Numerical analysis of energy piles in a hypoplastic soft clay under cyclic thermal loading

Contact Info

Product

Resources

About