Technological advances and applications of geothermal energy pile foundations and their feasibility in Australia

Moel, Monique de; Bach, Peter M.; Bouazza, Abdelmalek; Singh, Rao Martand; Sun, JingLiang O.

doi:10.1016/j.rser.2010.07.027

Cited by 148 publications

(57 citation statements)

References 63 publications

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“…Thermal effects added up to mechanical ones could modify the design criteria which are stated in common foundation design codes. Many studies could be found in the literature, which justify the feasibility of this technology from an economic and energy point of view [5,6,8,22]. However, there is little research on geotechnical aspects of heat exchanger piles.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the mechanical behaviour of a heat exchanger pile using physical modelling

et al. 2014

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Abstract:This study aims to provide knowledge on the thermo-mechanical behaviour of heat exchanger piles, through a laboratory scale model. The model pile (20 mm in external diameter) was embedded in dry sand. The behaviour of the axially loaded pile under thermal cycles was investigated. After applying the axial load on the pile head, the pile"s temperature was varied between 5 °C and 30 °C. Seven tests, corresponding to various axial loads ranging from 0 to 70 % of the pile estimated bearing capacity, were performed. The results on pile head displacement show that heating under low axial load induced heave and cooling induced settlement; the pile temperature-displacement curve was found to be reversible and compatible with the thermal expansion curve of the pile. However, at higher axial loads, irreversible settlement of the pile head was observed after a few thermal cycles. The axial load profile measured by the strain gauges evidenced that the pile head load was mainly transferred to the pile toe. Nevertheless, thermal cycles modified significantly the mobilised skin friction along the pile. The total pressure measured at various locations in the soil mass was also slightly influenced by the thermal cycles.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the mechanical behaviour of a heat exchanger pile using physical modelling

et al. 2014

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“…This is in contrast to the Republic of Ireland where it is believed that no such systems exist (Hemmingway and Long, 2011a). In spite of growing interest in the area, there is a distinct lack of documented thermal response tests on energy foundations (Amis et al, 2010, de Moel et al, 2010. A thermal response test (TRT) is a controlled insitu test during which a known quantity of heat energy is injected into (or extracted from) a closed loop borehole heat exchanger via a circulating heat carrier fluid, while the change of the fluid temperature is monitored.…”

Section: Introductionmentioning

confidence: 98%

Energy piles: site investigation and analysis

Hemmingway

Long

2013

Proceedings of the Institution of Civil Engineers - Geotechnica

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Despite an increasing use world-wide of geothermal energy foundations there is a lack of published guidelines and results from thermal response testing of such installations. In this paper the results from thermal response, thermal recovery and laboratory thermal testing performed at two sites in Ireland are presented. Some practical issues concerned with use of thermal response testing rigs, designed for use with deep boreholes, on relatively short piles are discussed and addressed. Given the relatively short geothermally active depth of the energy foundations tested and due to the fact that the UCD thermal response testing rig has been designed primarily for testing on medium and deep geothermal boreholes, shorter thermal response test durations than are normally

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“…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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Technological advances and applications of geothermal energy pile foundations and their feasibility in Australia

Cited by 148 publications

References 63 publications

Experimental study on the mechanical behaviour of a heat exchanger pile using physical modelling

Experimental study on the mechanical behaviour of a heat exchanger pile using physical modelling

Energy piles: site investigation and analysis

3D transient heat transfer numerical analysis of multiple energy piles

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