Understanding the temperature-induced mechanical behaviour of energy pile foundations

Suryatriyastuti, M.E.; Mroueh, Hussein; Burlon, Sébastien

doi:10.1016/j.rser.2012.02.062

Cited by 113 publications

(51 citation statements)

References 13 publications

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“…The 3D model contains two domains (Figure 3a): the soil and the concrete pile, which contains a line heat source mimicking the PE-X pipe (Figure 3c). The model dimensions were established following the suggestions by Suryatriyastuti et al (2012): lateral extension 25B, being B = 0.3 m (pile side), and vertical height for the soil volume 2L, being L = 15 m (pile length). A quarter of the domain has been simulated taking advantage of symmetries ( Figure 3b).…”

Section: Finite Element Model Characteristicsmentioning

confidence: 99%

“…No interface elements between the pile and the soil have been considered, allowing a perfect contact between them. This has been considered a conservative scenario since Suryatriyastuti et al (2012) andHassani Nezhad Gashti et al (2014) reported that simulated thermal stresses are larger in perfect contact. The finite element model uses a mesh with 34,505 tetrahedral elements, more refined around the pile and it gets coarser with distance (Figure 3a).…”

Section: Finite Element Model Characteristicsmentioning

confidence: 99%

“…Several numerical studies explore the thermo-mechanical phenomena of energy piles in different soil conditions. Regarding load transfer mechanisms, Suryatriyastuti et al (2012), Hassani Nezhad Gashti et al (2014)and Laloui et al (2006) encompass good examples validated against experimental data.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger

Pagola¹,

Madsen²,

Jensen³

et al. 2017

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

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Pile heat exchangers are traditional foundation piles with built in heat exchangers. As such, the footing of the building both serves as a structural component and a heating/cooling supply element. The existing geotechnical design standards do not consider the nature of thermo-active foundations and, therefore, there is a need to develop guidelines to design them properly. This paper contributes by studying the thermo-mechanical behavior of the precast piles which are 15-meter long and have a quadratic cross section and a W-shape pipe heat exchanger. This article aims to numerically assess the additional changes in the pile load transfer generated by its heating and cooling. In addressing this objective, a preliminary multi-physical finite element analysis is conducted which serves as a tool for exploring: i) the thermally induced mechanical stresses within the concrete and on the pile-soil axial and shaft resistances; ii) the maximum upward/downward displacements. A one-year time span is considered under operational and extreme thermal boundary conditions. The results show that a typical geothermal utilization of the energy foundation does not generate significant structural implications onthe geotechnical capacity of a single energy pile. However, ground thermal loads need to be considered in the design phase to account for potential extreme temperature changes, which could generate thermal stresses that equalize the mechanically generated ones.

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Section: Finite Element Model Characteristicsmentioning

confidence: 99%

Section: Finite Element Model Characteristicsmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger

Pagola¹,

Madsen²,

Jensen³

et al. 2017

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

View full text Add to dashboard Cite

show abstract

“…The primary merit of the EP is its dual functions as building structural component and heat exchanger. Moreover, concrete is regarded as an idea heat transfer intermediate owing to its good thermal conductivity and thermal storage capacity [8,9]. Studies have shown that GSHP with the EP system can save up to 75% of energy for building space heating and cooling compared to the conventional air conditioning system [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

3D transient heat transfer numerical analysis of multiple energy piles

Cui

Zhu

2017

Energy and Buildings

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This paper presents a three-dimensional (3D) transient heat transfer numerical model for multiple energy piles based on the finite volume method (FVM). The initial and boundary conditions are established and the effects of "thermal short-circulating" between two pipes of a U-tube in energy pile are investigated. Thermal partial differential equations are discretized at the spatial nodal points and solved by linear approximation method. Temperature variations of working fluid, energy pile and its surrounding soil from simulation program are compared with experimental data to validate the developed model. In addition, the influences of fluid flow rate and U-tube shank spacing are analysed. It is established that the shank spacing should be set in a range of 0.06m to 0.10m to reduce heat transfer between the two pipes and meet the structural requirement. Meanwhile, the flow rate should be controlled in a range of 0.5m 3 /h to 0.7m 3 /h to avoid the low outlet fluid temperature and decrease the influence of "thermal short-circuiting".

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“…Modeling the FPGHE with spiral coils is complex and existing studies concentrated on the numerical or experimental methods. Suryatriyastuti carried out a 3-D numerical heat transfer analysis on the energy pile under the constant heat load case (Suryatriyastuti, et al 2012). Xiang built a numerical model includes a 1-D transient convection-diffusion submodel for the fluid domain and a 1-D transient diffusion submodel for the solid domain (Xiang, et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Design and Analytical Analysis of Foundation Pile Ground Heat Exchanger with Spiral Coils

Man¹,

Qu²,

Wang³

et al. 2017

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

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Understanding the temperature-induced mechanical behaviour of energy pile foundations

Cited by 113 publications

References 13 publications

Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger

Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger

3D transient heat transfer numerical analysis of multiple energy piles

Design and Analytical Analysis of Foundation Pile Ground Heat Exchanger with Spiral Coils

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