Heat exchange mechanisms in energy tunnel systems

Bidarmaghz, Asal; Narsilio, Guillermo A.

doi:10.1016/j.gete.2018.07.004

Cited by 101 publications

(25 citation statements)

References 17 publications

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“…The energy performance of energy segmental linings for a variation in the conditions that govern the heat and mass transfer phenomena characterising the ground has been investigated (Di Donna and . The phenomena and interactions occurring between energy segmental linings and the underground built environment where air is present have been considered (Bourne-Webb et al, 2016;Bidarmaghz and Narsilio, 2018;Peltier et al, 2019). Comments on the influence of some design solutions applicable to energy segmental linings have also been proposed (Barla and Di Donna, 2018).…”

Section: Introductionmentioning

confidence: 99%

Energy performance and economic feasibility of energy segmental linings for subway tunnels

Cousin

Loria

Bourget³

et al. 2019

Tunnelling and Underground Space Technology

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This study focuses on the analysis of the energy performance and economic feasibility of so-called tunnel energy segmental linings: an innovative technology that couples the structural support role of the tunnel lining with the heating-cooling role of the heat exchanger harvesting both shallow geothermal and aerothermal energies. The work is based on three-dimensional time-dependent thermo-hydraulic finite element analyses of a real case-study and presents a sensitivity investigation on the energy performance of energy segmental linings for a variation of the following design solutions: (i) pipe configuration, (ii) heat carrier fluid flow rate and (iii) pipe distance from the tunnel intrados. Selecting the smaller pipe diameter for a pipe layout perpendicular to the tunnel axis involves installing a configuration with the higher pipe length per segment and represents the optimal solution in terms of thermal power harvested per unit lining surface. Increasing the heat carrier fluid flow rate to increase the turbulence in pipes represents an effective approach to improve the energy performance, with a decreasing effectiveness for a successive increase of the heat carrier fluid flow rate. Decreasing the distance between the pipes from the tunnel intrados significantly improves the energy performance, with an increasing effectiveness for a successive increase of the heat carrier fluid flow rate. The previous design solutions markedly influence the capital investment and operation costs of thermal power plants resorting to energy tunnels. For the same site conditions but different design solutions, these plants may not be considered economically attractive, with the most profitable application that is not necessarily associated with the design involving the highest harvested thermal power via the geostructure. Based on the results of this research, energy segmental linings appear a breakthrough technology for the renewable energy supply of the built environment when properly analysed and designed.

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Section: Introductionmentioning

confidence: 99%

Energy performance and economic feasibility of energy segmental linings for subway tunnels

Cousin

Loria

Bourget³

et al. 2019

Tunnelling and Underground Space Technology

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“…The advent of relatively sophisticated and accessible numerical software currently facilitates the modeling of the pipes embedded in energy geostructures that significantly characterize their geothermal operation and the associated heat and mass transfers. Through this capability, pipes can be modeled as linear elements [e.g., [101][102][103][104]39,105,106,37,[107][108][109]38] or heat sources [e.g., 110,12,100], but also as actual three-dimensional ducts [e.g., 54]. The hypotheses involved in the previous approaches can lead to predictions that may be more or less adherent to the actual thermo-hydraulic conditions occurring within the pipes.…”

Section: Simulation Of the Geothermal Operationmentioning

confidence: 99%

“…Simulating the actual dynamics of airflows characterizing underground built environments adjacent to energy geostructures is indeed feasible [e.g., 108,13]. This approach is needed to capture the development and the perturbations of the thermal and boundary layers that govern the heat transfer between energy geostructures and the embedded built environments [13].…”

Section: Modeling Of Environmental Boundary Conditionsmentioning

confidence: 99%

Energy geostructures: Theory and application

Loria

2020

E3S Web Conf.

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The subsurface represents space and resource of ever-growing importance to meet human activity needs associated with the availability of built environments and energy. So-called energy geostructures represent a breakthrough technology in this context. By integrating the structural support role of earth-contact structures with the heating-cooling role of shallow geothermal heat exchangers, energy geostructures can sustain or enclose built environments while providing them with renewable thermal energy. Despite such promising features, the integrated roles of energy geostructures pose various challenges to understand their behavior and performance, and to address the related analysis and design. Appropriate formulation and application of scientific theory are crucial for the successful analysis and design of energy geostructures. This Bright Spark Lecture Paper presents selected theory for addressing the behavior and performance of energy geostructures, and discusses the application of this theory to analysis and design. In this context, the work focuses on energy piles and barrettes, energy tunnels, as well as energy walls and slabs. The ultimate goal of this paper is to provide competence for facilitating future research and development of energy geostructures across science and engineering.

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“…Heat flow in soils affects the design and management of engineered geosystems, such as thermal solar energy storage facilities (Brosseau et al 2005), shallow and deep thermal foundations (Laloui et al 2006), hybrid renewable geothermal systems (Bajpai and Dash 2012;Bidarmaghz and Narsilio 2018), gravity-assisted steam flooding for heavy oil recovery (Wang and Dusseault 2003), and nuclear waste disposal strategies (Madsen 1998;Tang et al 2008;Gens 2010). These geosystems experience a wide range of stress and temperature conditions in addition to changes in fluid chemistry, pressure, and saturation.…”

Section: Introductionmentioning

confidence: 99%