Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger

Maria Alberdi Pagola, Søren Madsen, Rasmus Lund Jensen, Søren Erbs Poulsen

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Resumé

Pile heat exchangers are traditional foundation piles with built in heat exchangers. As such, the footing of the building both serves as a structural component and a heating/cooling supply element. The existing geotechnical design standards do not consider the nature of thermo-active foundations and, therefore, there is a need to develop guidelines to design them properly. This paper contributes by studying the thermo-mechanical behavior of the precast piles which are 15-meter long and have a quadratic cross section and a W-shape pipe heat exchanger. This article aims to numerically assess the additional changes in the pile load transfer generated by its heating and cooling. In addressing this objective, a preliminary multi-physical finite element analysis is conducted which serves as a tool for exploring: i) the thermally induced mechanical stresses within the concrete and on the pile-soil axial and shaft resistances; ii) the maximum upward/downward displacements. A one-year time span is considered under operational and extreme thermal boundary conditions. The results show that a typical geothermal utilization of the energy foundation does not generate significant structural implications on the geotechnical capacity of a single energy pile. However, ground thermal loads need to be considered in the design phase to account for potential extreme temperature changes, which could generate thermal stresses that equalize the mechanically generated ones.
OriginalsprogEngelsk
TitelProceedings of the IGSHPA Technical/Research Conference and Expo 2017
Antal sider10
Udgivelses stedDenver
ForlagInternational Ground Source Heat Pump Association
Publikationsdato2017
DOI
StatusUdgivet - 2017
BegivenhedThe IGSHPA Technical/Research Conference and Expo - Denver, USA
Varighed: 14 mar. 201716 mar. 2017

Konference

KonferenceThe IGSHPA Technical/Research Conference and Expo
LandUSA
ByDenver
Periode14/03/201716/03/2017

Fingerprint

Piles
Heat exchangers
Cooling
Heating
Pile foundations
Thermal load
Thermal stress
Pipe
Boundary conditions
Concretes
Soils
Finite element method
Temperature

Citer dette

Pagola, M. A., Madsen, S., Jensen, R. L., & Poulsen, S. E. (2017). Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger. I Proceedings of the IGSHPA Technical/Research Conference and Expo 2017 Denver: International Ground Source Heat Pump Association. https://doi.org/10.22488/okstate.17.000520
Pagola, Maria Alberdi ; Madsen, Søren ; Jensen, Rasmus Lund ; Poulsen, Søren Erbs. / Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger. Proceedings of the IGSHPA Technical/Research Conference and Expo 2017. Denver : International Ground Source Heat Pump Association, 2017.
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title = "Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger",
abstract = "Pile heat exchangers are traditional foundation piles with built in heat exchangers. As such, the footing of the building both serves as a structural component and a heating/cooling supply element. The existing geotechnical design standards do not consider the nature of thermo-active foundations and, therefore, there is a need to develop guidelines to design them properly. This paper contributes by studying the thermo-mechanical behavior of the precast piles which are 15-meter long and have a quadratic cross section and a W-shape pipe heat exchanger. This article aims to numerically assess the additional changes in the pile load transfer generated by its heating and cooling. In addressing this objective, a preliminary multi-physical finite element analysis is conducted which serves as a tool for exploring: i) the thermally induced mechanical stresses within the concrete and on the pile-soil axial and shaft resistances; ii) the maximum upward/downward displacements. A one-year time span is considered under operational and extreme thermal boundary conditions. The results show that a typical geothermal utilization of the energy foundation does not generate significant structural implications on the geotechnical capacity of a single energy pile. However, ground thermal loads need to be considered in the design phase to account for potential extreme temperature changes, which could generate thermal stresses that equalize the mechanically generated ones.",
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Pagola, MA, Madsen, S, Jensen, RL & Poulsen, SE 2017, Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger. i Proceedings of the IGSHPA Technical/Research Conference and Expo 2017. International Ground Source Heat Pump Association, Denver, Denver, USA, 14/03/2017. https://doi.org/10.22488/okstate.17.000520

Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger. / Pagola, Maria Alberdi; Madsen, Søren; Jensen, Rasmus Lund; Poulsen, Søren Erbs.

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017. Denver : International Ground Source Heat Pump Association, 2017.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

TY - GEN

T1 - Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger

AU - Pagola, Maria Alberdi

AU - Madsen, Søren

AU - Jensen, Rasmus Lund

AU - Poulsen, Søren Erbs

PY - 2017

Y1 - 2017

N2 - Pile heat exchangers are traditional foundation piles with built in heat exchangers. As such, the footing of the building both serves as a structural component and a heating/cooling supply element. The existing geotechnical design standards do not consider the nature of thermo-active foundations and, therefore, there is a need to develop guidelines to design them properly. This paper contributes by studying the thermo-mechanical behavior of the precast piles which are 15-meter long and have a quadratic cross section and a W-shape pipe heat exchanger. This article aims to numerically assess the additional changes in the pile load transfer generated by its heating and cooling. In addressing this objective, a preliminary multi-physical finite element analysis is conducted which serves as a tool for exploring: i) the thermally induced mechanical stresses within the concrete and on the pile-soil axial and shaft resistances; ii) the maximum upward/downward displacements. A one-year time span is considered under operational and extreme thermal boundary conditions. The results show that a typical geothermal utilization of the energy foundation does not generate significant structural implications on the geotechnical capacity of a single energy pile. However, ground thermal loads need to be considered in the design phase to account for potential extreme temperature changes, which could generate thermal stresses that equalize the mechanically generated ones.

AB - Pile heat exchangers are traditional foundation piles with built in heat exchangers. As such, the footing of the building both serves as a structural component and a heating/cooling supply element. The existing geotechnical design standards do not consider the nature of thermo-active foundations and, therefore, there is a need to develop guidelines to design them properly. This paper contributes by studying the thermo-mechanical behavior of the precast piles which are 15-meter long and have a quadratic cross section and a W-shape pipe heat exchanger. This article aims to numerically assess the additional changes in the pile load transfer generated by its heating and cooling. In addressing this objective, a preliminary multi-physical finite element analysis is conducted which serves as a tool for exploring: i) the thermally induced mechanical stresses within the concrete and on the pile-soil axial and shaft resistances; ii) the maximum upward/downward displacements. A one-year time span is considered under operational and extreme thermal boundary conditions. The results show that a typical geothermal utilization of the energy foundation does not generate significant structural implications on the geotechnical capacity of a single energy pile. However, ground thermal loads need to be considered in the design phase to account for potential extreme temperature changes, which could generate thermal stresses that equalize the mechanically generated ones.

U2 - 10.22488/okstate.17.000520

DO - 10.22488/okstate.17.000520

M3 - Article in proceeding

BT - Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

PB - International Ground Source Heat Pump Association

CY - Denver

ER -

Pagola MA, Madsen S, Jensen RL, Poulsen SE. Numerical Investigation on the Thermo-mechanical Behavior of a Quadratic Cross Section Pile Heat Exchanger. I Proceedings of the IGSHPA Technical/Research Conference and Expo 2017. Denver: International Ground Source Heat Pump Association. 2017 https://doi.org/10.22488/okstate.17.000520