4.7 Article

Early-stage thermal performance design of thermo-active walls implemented in underground infrastructures

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出版社

ELSEVIER
DOI: 10.1016/j.gete.2020.100218

关键词

Renewable energy; Geothermal energy; Energy geostructures; Hydrothermal modeling; Thermal potential of sites; Sustainable infrastructures; Underground infrastructures; Low carbon engineering

资金

  1. European Commission via the Marie Sk?odowska-Curie Innovative Training Networks (ITN-ETN) project TERRE 'Training Engineers [H2020-MSCA-ITN-2015-675762]

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This study focuses on the thermal design of thermo-active walls and investigates heat-exchange modes involving energy walls and surrounding materials through extensive three-dimensional hydrothermal finite-element simulations. The results are presented as charts related to the thermal behavior of the heat exchangers under different hydrothermal environments.
Energy geostructures (EGs) represent an innovative technology in the sustainable energy agenda and are useful for satisfying the energy needs of the built environment. They are usually involving geostructures such as piles, walls, tunnels, shafts, and sewers. The application of such technology to infrastructure projects may have considerable thermal potential because of the large surfaces that can be thermally activated. This study focuses on thermo-active walls (energy walls, EWs), which are retaining structures used to sustain the sides of excavations. Key features related to their thermal design are examined, and a design methodology is proposed. The heat-exchange modes involving EWs and the surrounding materials (concrete, soil, air) are investigated via extensive three-dimensional hydrothermal finite-element simulations involving the non-isothermal flow in the heat exchangers (HEs), as well as all other heat-exchange modes. The results are first presented as charts related to the thermal behavior of the HEs under different hydrothermal environments. Finally, a methodology for early-stage thermal performance design is proposed, and a corresponding flowchart is presented. This study may be helpful for incorporating EGs into the engineering design.(C) 2020 The Author(s). Published by Elsevier Ltd.

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