Thermal performance analysis of an energy pile with triple helix ground heat exchanger

Farajollahi, Amir Hamzeh; Asgari, Behrad; Rostami, Mohsen

doi:10.1016/j.geothermics.2022.102459

Cited by 12 publications

(2 citation statements)

References 47 publications

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“…It has been found that energy piles in the form of buried spiral pipes have a higher average temperature, a more uniform temperature distribution in the cross section, and better thermal performance than piles in other pipe shapes. It is suggested that spiral pitch is an important factor affecting thermal conductivity [1][2][3]. It has also been found that the thermal conductivity of the soil around a pile also greatly influences that of the energy pile [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A Multiphysics Simulation Study of the Thermomechanical Coupling Response of Energy Piles

Xu,

Wang,

Meng

et al. 2024

Buildings

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The global demand for energy is on the rise, accompanied by increasing requirements for low-carbon environmental protection. In recent years, China’s “double carbon action” initiative has brought about new development opportunities across various sectors. The concept of energy pile foundation aims to harness geothermal energy, aligning well with green, low-carbon, and sustainable development principles, thus offering extensive application prospects in engineering. Drawing from existing research globally, this paper delves into four key aspects impacting the thermodynamic properties of energy piles: the design of buried pipes, pile structure, heat storage materials within the pipe core, and soil treatment around the pile using carbon fiber urease mineralization. Leveraging the innovative mineralization technique known as urease-induced carbonate mineralization precipitation (EICP), this study employs COMSOL Multiphysics simulation software to analyze heat transfer dynamics and establish twelve sets of numerical models for energy piles. The buried pipe design encompasses two types, U-shaped and spiral, while the pile structure includes concrete solid energy piles and tubular energy piles. Soil conditions around the pile are classified into undisturbed sand and carbon fiber-infused EICP mineralized sand. Different inner core heat storage materials such as air, water, unaltered sand, and carbon fiber-based EICP mineralized sand are examined within tubular piles. Key findings indicate that spiral buried pipes outperform U-shaped ones, especially when filled with liquid thermal energy storage (TES) materials, enhancing temperature control of energy piles. The carbon fiber urease mineralization technique significantly improves heat exchange between energy piles and surrounding soil, reducing soil porosity to 4.9%. With a carbon fiber content of 1.2%, the ultimate compressive strength reaches 1419.4 kPa. Tubular energy piles mitigate pile stress during summer temperature fluctuations. Pile stress distribution varies under load and temperature stresses, with downward and upward friction observed at different points along the pile length. Overall, this research underscores the efficacy of energy pile technologies in optimizing energy efficiency while aligning with sustainable development goals.

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Section: Introductionmentioning

confidence: 99%

A Multiphysics Simulation Study of the Thermomechanical Coupling Response of Energy Piles

Xu,

Wang,

Meng

et al. 2024

Buildings

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“…There have been numerous studies demonstrating the efficiency of GHEs in both heating and cooling [7] . Ground-source heat pumps (GSHP) achieve optimal performance due to the thermal interaction of the pipes with the surrounding soil in addition to the surface area between the pipes and the soil [8] . For buildings, GHEs are generally used in conjunction with heat pumps for cooling and heating; such systems are called GSHPs [9] .…”

Section: Introductionmentioning

confidence: 99%

An Estimation of the Performance of a Passive Cooling System Incorporating a Ground Heat Exchanger Using a Multilayer Artificial Neural Network

2022

J Mod Green Energy

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Objective: This paper examines the cooling of an office building without a heat pump, using only ground heat exchangers (GHE) and implementing artificial neural network (ANN) to train it on experimental data. Methods:The office building is situated at 38° 40′ 57′′ N latitude and 39° 10′ 29′′ E longitude in the province of Elazig. Each minute, the installed system was monitoring the office's external meteorological data, the office's indoor meteorological data, the GHE inlet and outlet temperatures, and the amount of heat load developed during the cooling process. In this study, the passive cooling system's cooling load and coefficient of performance (COP) were experimentally examined. A second important contribution of this paper is the multilayer ANN model that was created using data selected from the experimental setup, which was measured and recorded.Results: During the summer months of 2018, the COP of the system was measured to be 1.67 on average. The accuracy rates of the multilayer ANN model proposed for cooling systems were calculated to be over 99% and 95% in the training and test datasets, respectively. It was observed that the performance value estimated by ANN converges to the true value by 99%. Conclusion:Having performed this study, it has been demonstrated that passive cooling can be achieved with GHE, and by conducting this study without utilizing a heat pump system, we intend to contribute significantly to the relevant scientific literature.

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Successive expansion and contraction of tubes (SECT) in a novel design of shell-and-tube heat exchanger: entropy generation analysis

Avecilla,

Farajollahi,

Rostami

et al. 2024

J Braz. Soc. Mech. Sci. Eng.

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Thermal performance analysis of an energy pile with triple helix ground heat exchanger

Cited by 12 publications

References 47 publications

A Multiphysics Simulation Study of the Thermomechanical Coupling Response of Energy Piles

A Multiphysics Simulation Study of the Thermomechanical Coupling Response of Energy Piles

An Estimation of the Performance of a Passive Cooling System Incorporating a Ground Heat Exchanger Using a Multilayer Artificial Neural Network

Successive expansion and contraction of tubes (SECT) in a novel design of shell-and-tube heat exchanger: entropy generation analysis

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