Evaluation of the thermal efficiency and a cost analysis of different types of ground heat exchangers in energy piles

Yoon, Seok; Lee, Seung-Rae; Xue, Jianfeng; Zoßeder, Kai; Go, Gyu-Hyun; Park, Hyunku

doi:10.1016/j.enconman.2015.08.002

Cited by 87 publications

(29 citation statements)

References 30 publications

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“…In the previous studies, spiral tube HEX was found to have a higher heat transfer rate than double U-tube HEX 13 and W-tube HEX. 22 While triple U-tube HEX was found to have a higher heat transfer rate than double U-tube and single U-tube 12,16 , and higher than that of W-tube HEX, 12 16,17 Jalaluddin et al 20 found that increasing the flow rate of the working fluid from 2 L/min to 4 L/min led to an increase in the amount of heat transferred. They only found a slight increase in the amount of heat transferred after increasing the flow rate from 4 L/min to 8 L/min.…”

Section: Energy Pile Designmentioning

confidence: 99%

Underground energy storage utilizing concrete building foundation: Experimental and numerical approach

Mousa

Bayomy

Wang³

et al. 2020

Int J Energy Res

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Space heating and cooling represent 63% of total building energy demand. In the present study, the concept of concrete foundation piles was used as an underground storage medium. This system requires no additional drilling costs or space, unlike conventional boreholes. A laboratory-scaled experiment facility was designed to experimentally investigate the thermal response of a concrete pile during the charging and discharging processes. The amount of energy stored and released during each process was evaluated. A flow rate parametric study was also conducted to explore the effect of the laminar and turbulent flow behavior. In order to complement the experimental study, an extensive CFD model was developed and compared with the experimental data. There was good agreement between the numerical and experimental results for each process at different flow rates. The results revealed that increasing the flow rate increases not only the heat rejection and extraction but also the storage efficiency.

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Section: Energy Pile Designmentioning

confidence: 99%

Underground energy storage utilizing concrete building foundation: Experimental and numerical approach

Mousa

Bayomy

Wang³

et al. 2020

Int J Energy Res

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“…Park et al 2013;Go et al 2014;Man et al 2011). Comparative studies have shown helical pipe arrangements to potentially offer greater heat transfer rates compared to standard energy pile arrangements Yoon et al 2015). At least some of this advantage is due to the greater pipe lengths that can be accommodated within the pile using the spiral arrangement.…”

Section: Pipe Arrangements and Pile Geometrymentioning

confidence: 99%

“…Energy geostructures are foundations or other buried geotechnical structures which have been equipped with heat transfer pipes so that they may act as the ground heat exchanger (GHE) part of a GSHP system. Therefore, energy geostructures remove the need for construction of special purpose GHEs, offering opportunities to reduce capital costs for shallow geothermal energy (CIBSE, 2013;Park et al 2015;Lu and Narsilio 2019;Akrouch et al 2018). Piles are the most common type of energy geostructure, having been first constructed in northern Europe in the 1980's (Brandl 2006).…”

Section: Introductionmentioning

confidence: 99%

Energy geostructures: A review of analysis approaches, in situ testing and model scale experiments

Loveridge

McCartney

Narsilio

et al. 2020

Geomechanics for Energy and the Environment

102

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TThis position paper was developed by members of the task force on "Energy Geostructures" of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE) Technical Committee TC308 on 'Energy Geotechnics'. The article includes a summary and review of some of the most recent analysis approaches, in situ testing, full scale testing and model scale experiments with a focus on energy piles and other energy geostructures. The geotechnics literature in these topics has increased rapidly in the last five years suggesting a surge in this emerging research area. Here complementary lines of research can be distinguished, one focusing on thermal analysis and another focusing on thermo-geomechanical analysis. Limitations, shortcomings and knowledge gaps are identified and needs for further research and development within the geotechnical community are highlighted.

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“…Several scholars had conducted research on the heat exchange efficiency of energy piles. Bozis et al (2011) evaluated the effects of design parameters on the efficiency of heat transfer in energy piles [13]; estimated the constructability and heat exchange efficiency of large diameter cast-in-place energy piles with various configurations of heat exchange pipes [14]; Yoon et al (2015) reported the thermal efficiency and cost analysis of different types of ground heat exchangers in energy piles [15]; Cecinato and Loveridge (2015) analyzed the factors influencing the thermal efficiency of energy piles [16]; Astrain et al (2016) performed a comparative study of different heat exchanger systems in a thermoelectric refrigerator and their influence on efficiency [17]; Akrouch et al (2016) conducted experimental, analytical, and numerical studies on the thermal efficiency of energy piles in unsaturated soils [18]. On energy piles, there are some more research papers which provide technical guidelines for the construction of heat exchanger [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Thermal Effect on Structural Interaction between Energy Pile and Its Host Soil

2017

Advances in Materials Science and Engineering

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Energy pile is one of the promising areas in the burgeoning green power technology; it is gradually gaining attention and will have wide applications in the future. Because of its specific structure, the energy pile has the functions of both a structural element and a heat exchanger. However, most researchers have been paying attention to only the heat transfer process and its efficiency. Very few studies have been done on the structural interaction between the energy pile and its host soil. As the behavior of the host soil is complicated and uncertain, thermal stresses appear with inhomogeneous distribution along the pile, and the peak value and distribution of stress will be affected by the thermal and physical properties and thermal conductivities of the structure and the host soil. In view of the above, it is important to determine thermal-mechanical coupled behavior under these conditions. In this study, a comprehensive method using theoretical derivations and numerical simulation was adopted to analyze the structural interaction between the energy pile and its host soil. The results of this study could provide technical guidance for the construction of energy piles.

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Evaluation of the thermal efficiency and a cost analysis of different types of ground heat exchangers in energy piles

Cited by 87 publications

References 30 publications

Underground energy storage utilizing concrete building foundation: Experimental and numerical approach

Underground energy storage utilizing concrete building foundation: Experimental and numerical approach

Energy geostructures: A review of analysis approaches, in situ testing and model scale experiments

Thermal Effect on Structural Interaction between Energy Pile and Its Host Soil

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