Feasibility study of snow melting system for bridge decks using geothermal energy piles integrated with heat pump in Canada

Liu, Hongwei; Maghoul, Pooneh; Bahari, Ali; Kavgic, Miroslava

doi:10.1016/j.renene.2018.09.109

Cited by 39 publications

(14 citation statements)

References 6 publications

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“…where ℎ is the convective heat transfer coefficient whose value is assumed to be equal to 6 W/m 2°C [5], is the basement indoor air temperature that is assumed constant and equal to 20°C, is the temperature at the ground surface.…”

Section: Governing Equationsmentioning

confidence: 99%

“…However, during spring, thawing occurs at the soil-pile interface, which decreases the bearing capacity of the piles significantly. The occurrence of such freezing and thawing cycles at the soilpile interface adversely affects the structural integrity as well as the energy efficiency of such systems [5]. Therefore, it is important to consider the potential occurrence of ground thermal imbalance, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles

2020

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Harvesting geothermal energy through the use of thermo-active pile systems is an eco-friendly technique to provide HVAC energy demand of buildings. Mechanical behaviour of thermo-active piles is impacted by thermal cycles. Moreover, in urban areas, the temperature of the ground is higher than non-constructed areas due to the heat loss through the below-grade enclosure of buildings. This heat dissipation increases the thermal capacity of the soil and affects the mechanical response of the geothermal pile foundation subjected to thermo-mechanical loading. To investigate the effect of buildings heat loss on thermo-active piles, a numerical thermo-mechanical (TM) analysis was carried out on a proposed energy foundation system for an institutional building, the Stanley Pauley Engineering Building (SPEB) in the campus of the University of Manitoba, Winnipeg, Canada. The mechanical response of the geothermal piles to the thermal cycles with and without considering heat leakage through the basement of the SPEB is compared. Results showed that the cooling loads induced a maximum vertical pile head displacement of -1.18 mm. After 5 years operation of the system, the maximum vertical pile head displacement decreased to -1.05 mm for the case in which heat loss through the basement in considered in the models. In addition, the maximum axial load effective along the pile axis was 6% higher for the case that considers heat loss through the basement compared to the case without considering heat leakage through the building’s below-grade envelope.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles

2020

Self Cite

View full text Add to dashboard Cite

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“…The occurrence of such freezing and thawing cycles at the soil-pile interface adversely affects the structural integrity as well as the energy efficiency of such systems [26]. Therefore, it is of paramount importance to consider the potential occurrence of ground thermal imbalance, i.e.…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical performance of a proposed energy pile system in cold regions

Saaly¹,

Maghoul²,

Hollaender³

et al. 2020

Preprint

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Energy piles are bi-functional structural elements that are used to support the structural loads of a building and to operate as a geo-heat exchanger for shallow geothermal energy systems. In urban areas, energy piles can eventually be used to harvest the heat loss through the basement enclosure and re-inject the energy to the building for the heating and cooling purposes. In spite of a higher thermal profile beneath the buildings due to energy loss through the below-grade envelope, an underground thermal imbalance may still occur due to the application of energy piles in cold regions. This paper aims to study the structural performance of an energy pile in cold regions considering the potential occurrence of thermal imbalance in the foundation soil through a Thermo-Mechanical (TM) analysis. This will be the first step of adoption of such a technology in Canadian cold climate. Results showed a safe margin between the pile settlement and the allowable settlement. However, the axial stress applied to the pile increased by 9% due to thermal loads. In addition, a maximum decrease of 9% in mobilized shaft friction along the pile-soil interface was recorded due to the thermal loads. To consider the energy piles as an alternative for buildings energy supply in cold regions, further considerations should be made to keep the mechanical response of the energy piles in the admissible range.

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“…In recent years, the advancement of new methods and applications of wireless networks drives the demand on microenergy harvesting for continuous power supply [11]. Among these various renewable energy sources, such as biomass [12,13], heat [14] and vibration [15,16], vibration-based energy harvesting has attracted the interest of many researchers because of the ubiquity and availability of various vibration sources. In addition to energy harvesting, piezoelectric materials have a wide range of applications [17][18][19][20][21] in various science and engineering disciplines.…”

Section: Introductionmentioning

confidence: 99%

Performance Enhancement of a Multiresonant Piezoelectric Energy Harvester for Low Frequency Vibrations

et al. 2019

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Harvesting electricity from low frequency vibration sources such as human motions using piezoelectric energy harvesters (PEH) is attracting the attention of many researchers in recent years. The energy harvested can potentially power portable electronic devices as well as some medical devices without the need of an external power source. For this purpose, the piezoelectric patch is often mechanically attached to a cantilever beam, such that the resonance frequency is predominantly governed by the cantilever beam. To increase the power generated from vibration sources with varying frequency, a multiresonant PEH (MRPEH) is often used. In this study, an attempt is made to enhance the performance of MRPEH with the use of a cantilever beam of optimised shape, i.e., a cantilever beam with two triangular branches. The performance is further enhanced through optimising the design of the proposed MRPEH to suit the frequency range of the targeted vibration source. A series of parametric studies were first carried out using finite-element analysis to provide in-depth understanding of the effect of each design parameters on the power output at a low frequency vibration. Selected outcomes were then experimentally verified. An optimised design was finally proposed. The results demonstrate that, with the use of a properly designed MRPEH, broadband energy harvesting is achievable and the efficiency of the PEH system can be significantly increased.

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Feasibility study of snow melting system for bridge decks using geothermal energy piles integrated with heat pump in Canada

Cited by 39 publications

References 6 publications

Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles

Investigation of the effects of heat loss through below-grade envelope of buildings in urban areas on thermo-mechanical behaviour of geothermal piles

Thermo-mechanical performance of a proposed energy pile system in cold regions

Performance Enhancement of a Multiresonant Piezoelectric Energy Harvester for Low Frequency Vibrations

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