Effects of Cyclic Temperature Variations on Thermal Response of an Energy Pile under a Residential Building

Faizal, Mohammed; Bouazza, Abdelmalek; McCartney, John S.; Haberfield, C M

doi:10.1061/(asce)gt.1943-5606.0002147

Cited by 67 publications

(24 citation statements)

References 42 publications

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“…Previous experimental and analytical studies on the thermo-active pile foundation have shown that the temperature changes and thermal-induced stresses in the soil are not critical under the operating conditions of typical applications [8][9][10][11][12][13][14][15][16][17][18][19]. However, the temperature changes in the soil may become significant under extreme thermal loading conditions (up to 30 • C) due to intensive uses of the energy piles [12,14,15,18].…”

Section: Performacne Of Thermal-active Energy Pilesmentioning

confidence: 99%

“…Similar thermal transfer analyses and temperature distribution studies were conducted extensively for thermo-active pile foundations [8][9][10][11][12][13][14][15][16][17][18][19]. In these studies, the pile was treated as a heat absorber for heat exchange between the ground surface and underground regions since the temperature at the ground surface fluctuates seasonally while the underground temperate remains constant.…”

Section: Introductionmentioning

confidence: 99%

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Group Pile Effect on Temperature Distributions inside Energy Storage Pile Foundations

et al. 2020

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Energy storage pile foundations are being developed for storing renewable energy by utilizing compressed air energy storage technology. Previous studies on isolated piles indicate that compressed air can result in pressure and temperature fluctuations in the pile, which can further affect safety of the pile foundation. Meanwhile, the temperature changes and distributions for the pile and surrounding soil also are influenced by adjacent piles in typical group pile constructions. Therefore, dynamic thermal transfer simulations were conducted in this paper to investigate the temperature changes and distributions in the concrete pile and surrounding soil for group pile construction. The main parameter in this study is the spacing of the piles. The analysis results show that the group pile effect significantly increases the temperature up to more than 100 °C depending on the location and changes its distribution in both concrete and soil due to the heat transferred from the adjacent piles. The final stabilized temperature can be as high as 120 °C in the concrete pile and 110 °C in the soil after numerous loading cycles, which is about 4 times higher than typical thermo-active energy pile applications. Thus, it is important to include the group pile effect for design and analysis of the energy storage pile foundation.

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Section: Performacne Of Thermal-active Energy Pilesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Group Pile Effect on Temperature Distributions inside Energy Storage Pile Foundations

et al. 2020

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“…Many previous studies only focused on underground thermal energy utilization and heat transferring efficiency of the heat pump system, but studying the mechanical performance of the energy pile under the impact of varying temperatures is limited. Some investigations of the field energy pile have been conducted while subjecting it to monotonic heating or cooling [5][6][7][8][9][10][11][12][13][14][15][16][17]. Laloui et al [5] Sustainability 2021, 13, 7411 2 of 12 conducted a field test on a cast-in-place energy pile located in the Lausanne Institute of Technology; it was found that its average temperature was raised by 1 • C, generating an additional axial force of 100 kN.…”

Section: Introductionmentioning

confidence: 99%

“…Murphy and McCartney [10] have numerically investigated seasonal temperature variation, and it was observed that the mobilized side shear stresses nonlinearly change with the depth; the magnitudes of thermomechanical axial stresses were observed to increase most greatly near the toe of both foundations while being heated. Fewer field-scale evaluations on radial thermal reactions of energy pile were conducted [11,14,15]. It is found that the axial strain of the pile is smaller than the radial strain when the pile body expands or contracts.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Thermal Response of Vertically Loaded Energy Pipe Pile

Wang

2021

Sustainability

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Energy piles are a relatively new technology that have dual function as heat transferring and load bearing. Due to the influence of temperature cycles, additional thermal stress and relative displacement of the pile will be generated; this is different from the load transferring mechanism of the conventional pile. In order to study the thermodynamic characteristics of the energy pipe pile under dual working conditions and temperature cycles, field tests were carried out on the PHC (prestressed high-strength concrete) energy pipe pile without constraining on the top of the piles. Displacement gauges were arranged on the top of the pile, and concrete strain gauges (temperature, strain) were embedded in the pile. The variation laws of temperature, thermal strain, thermal stress, side friction resistance, and displacement of the pile top during the temperature cycling were analyzed. The test results show that the heat exchange system reached a stable state after being heated for 5 days in summer. The average temperature of the pile increased by 15.17 °C, to 34.68 °C; it was low at both ends and high in the middle part. After 5 days in the winter environment, the average temperature of the pile decreased by 10.09 °C, to 9.54 °C, which was high at both ends and low in the middle. The thermal stress was generated inside the pile, and the maximum compressive stress was 3.446 MPa and the maximum tensile stress was 2.69 MPa. The neutral point of the side friction resistance appeared 8 m below the pile top, about 2/3 of the pile length. The maximum negative side friction resistance under the summer condition was 42.06 KPa, the maximum positive side friction resistance under the winter condition was 29.93 KPa, and the lateral resistance of the pile degraded in winter. Under the influence of thermal load, the final pile top displacements in the summer and winter were −0.7 mm (0.175%D) and 0.77 mm (0.193%D), respectively.

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“…Extensive research work, including experiments and numerical analyses, have been conducted on the temperature distribution and thermal mechanical behavior for thermo-active pile foundations [13][14][15][16][17][18][19]. However, the thermo-active pile foundation, which uses the pile as a heat absorber, is different from the proposed energy storage pile foundation system, where the pile is used as an energy storage medium through compressed air.…”

Section: Introductionmentioning

confidence: 99%

Temperature Distributions inside Concrete Sections of Renewable Energy Storage Pile Foundations

et al. 2019

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A new pile foundation system is being developed for renewable energy storage through a multi-disciplinary research project. This system utilizes the compressed air technology to store renewable energy inside the reinforced concrete pile foundation configured with hollowed sections. The compressed air can result in high air pressure to which the structural response of the pile foundation subjected has been studied. However, the temperature in the pile foundation can be affected by the compressed air if sufficient cooling is not provided. The temperature change can generate thermal stresses and affect the structural safety of the pile foundation. As a first step to investigate this thermal effect, this paper studies temperature distributions inside the concrete section for the pile foundation through non-steady state heat transfer analyses. Several parameters were considered in the study, including thermal conductivities of the concrete, specific heat capacities of the concrete, and dimensions of the pile foundation. It has been found that the temperature distribution along the concrete section varies significantly during a daily energy storage cycle as well as subsequent cycles due to the cumulative effect of residual temperatures at the end of each cycle. The temperature distribution is largely affected by the thermal conductivity of the concrete and the geometry of the pile foundation. The obtained temperature distribution can be used for investigation of the thermal stress inside the foundation and surrounding soil.

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Effects of Cyclic Temperature Variations on Thermal Response of an Energy Pile under a Residential Building

Cited by 67 publications

References 42 publications

Group Pile Effect on Temperature Distributions inside Energy Storage Pile Foundations

Group Pile Effect on Temperature Distributions inside Energy Storage Pile Foundations

Experimental Study of Thermal Response of Vertically Loaded Energy Pipe Pile

Temperature Distributions inside Concrete Sections of Renewable Energy Storage Pile Foundations

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