A new heating-cooling system for centrifuge testing of thermo-active geo-structures

Davide Vitali (Lead / Corresponding author), Anthony Leung, Rui Zhao, Jonathan Knappett

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

Centrifuge modelling has been considered as an effective means for investigating the energy and geotechnical performance of thermo-active geo-structures. A major challenge to correctly model (i) soil-structure heat trans-fer and (ii) thermo-mechanical behaviour of the geo-structure in a centrifuge is to design a system that could deliver sufficient heat energy (i.e. in terms of flowrate and temperature) under enhanced gravity conditions. This paper reports a new and robust heating/cooling system developed for these purposes and evaluates its performance. The proof heating tests performed up to 50-g suggest that when an appropriate pipe configura-tion is designed, the heating system is capable of producing a water flowrate up to 13.5 ml/s, which is suffi-cient to generate a turbulent flow regime within the water circulation pipe, hence maximising the convective heat transfer mechanism. The heating system has been successfully applied to deliver a controllable amount of heat energy, simultaneously, to multiple thermo-active piles in a row for warming up the surrounding soil. With proper thermal insulation of the pipework of the system, temperature loss between the target value at the pipe inlet and the one registered at the entrance of the model structure could be less than 2 ˚C. An idea for ex-tending the system to lower the temperature below ambient is also presented.
Original languageEnglish
Title of host publicationPhysical Modelling in Geotechnics
Subtitle of host publicationProceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom
EditorsAndrew McNamara, Sam Divall, Richard Goodey
PublisherTaylor & Francis
Pages475-480
Number of pages6
Volume1
ISBN (Print)978-1-138-34419-8
DOIs
Publication statusPublished - 24 Oct 2018
Event9th International Conference on Physical Modelling in Geoetchnics - City University, London, United Kingdom
Duration: 17 Jul 201820 Jul 2018

Conference

Conference9th International Conference on Physical Modelling in Geoetchnics
CountryUnited Kingdom
CityLondon
Period17/07/1820/07/18

Fingerprint

Centrifuges
Cooling systems
Heating
Pipe
Testing
Soils
Thermal insulation
Model structures
Temperature
Turbulent flow
Piles
Water
Gravitation
Heat transfer
Hot Temperature

Cite this

Vitali, D., Leung, A., Zhao, R., & Knappett, J. (2018). A new heating-cooling system for centrifuge testing of thermo-active geo-structures. In A. McNamara, S. Divall, & R. Goodey (Eds.), Physical Modelling in Geotechnics: Proceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom (Vol. 1, pp. 475-480). Taylor & Francis. https://doi.org/10.1201/9780429438646
Vitali, Davide ; Leung, Anthony ; Zhao, Rui ; Knappett, Jonathan. / A new heating-cooling system for centrifuge testing of thermo-active geo-structures. Physical Modelling in Geotechnics: Proceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom. editor / Andrew McNamara ; Sam Divall ; Richard Goodey. Vol. 1 Taylor & Francis, 2018. pp. 475-480
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abstract = "Centrifuge modelling has been considered as an effective means for investigating the energy and geotechnical performance of thermo-active geo-structures. A major challenge to correctly model (i) soil-structure heat trans-fer and (ii) thermo-mechanical behaviour of the geo-structure in a centrifuge is to design a system that could deliver sufficient heat energy (i.e. in terms of flowrate and temperature) under enhanced gravity conditions. This paper reports a new and robust heating/cooling system developed for these purposes and evaluates its performance. The proof heating tests performed up to 50-g suggest that when an appropriate pipe configura-tion is designed, the heating system is capable of producing a water flowrate up to 13.5 ml/s, which is suffi-cient to generate a turbulent flow regime within the water circulation pipe, hence maximising the convective heat transfer mechanism. The heating system has been successfully applied to deliver a controllable amount of heat energy, simultaneously, to multiple thermo-active piles in a row for warming up the surrounding soil. With proper thermal insulation of the pipework of the system, temperature loss between the target value at the pipe inlet and the one registered at the entrance of the model structure could be less than 2 ˚C. An idea for ex-tending the system to lower the temperature below ambient is also presented.",
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Vitali, D, Leung, A, Zhao, R & Knappett, J 2018, A new heating-cooling system for centrifuge testing of thermo-active geo-structures. in A McNamara, S Divall & R Goodey (eds), Physical Modelling in Geotechnics: Proceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom. vol. 1, Taylor & Francis, pp. 475-480, 9th International Conference on Physical Modelling in Geoetchnics, London, United Kingdom, 17/07/18. https://doi.org/10.1201/9780429438646

A new heating-cooling system for centrifuge testing of thermo-active geo-structures. / Vitali, Davide (Lead / Corresponding author); Leung, Anthony; Zhao, Rui; Knappett, Jonathan.

Physical Modelling in Geotechnics: Proceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom. ed. / Andrew McNamara; Sam Divall; Richard Goodey. Vol. 1 Taylor & Francis, 2018. p. 475-480.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - Centrifuge modelling has been considered as an effective means for investigating the energy and geotechnical performance of thermo-active geo-structures. A major challenge to correctly model (i) soil-structure heat trans-fer and (ii) thermo-mechanical behaviour of the geo-structure in a centrifuge is to design a system that could deliver sufficient heat energy (i.e. in terms of flowrate and temperature) under enhanced gravity conditions. This paper reports a new and robust heating/cooling system developed for these purposes and evaluates its performance. The proof heating tests performed up to 50-g suggest that when an appropriate pipe configura-tion is designed, the heating system is capable of producing a water flowrate up to 13.5 ml/s, which is suffi-cient to generate a turbulent flow regime within the water circulation pipe, hence maximising the convective heat transfer mechanism. The heating system has been successfully applied to deliver a controllable amount of heat energy, simultaneously, to multiple thermo-active piles in a row for warming up the surrounding soil. With proper thermal insulation of the pipework of the system, temperature loss between the target value at the pipe inlet and the one registered at the entrance of the model structure could be less than 2 ˚C. An idea for ex-tending the system to lower the temperature below ambient is also presented.

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BT - Physical Modelling in Geotechnics

A2 - McNamara, Andrew

A2 - Divall, Sam

A2 - Goodey, Richard

PB - Taylor & Francis

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Vitali D, Leung A, Zhao R, Knappett J. A new heating-cooling system for centrifuge testing of thermo-active geo-structures. In McNamara A, Divall S, Goodey R, editors, Physical Modelling in Geotechnics: Proceedings of the 9th International Conference on Physical Modelling in Geotechnics (ICPMG 2018), July 17-20, 2018, London, United Kingdom. Vol. 1. Taylor & Francis. 2018. p. 475-480 https://doi.org/10.1201/9780429438646