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A Model of a Diaphragm Wall Ground Heat Exchanger

Author

Listed:
  • Ida Shafagh

    (School of Civil Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
    Current address: School of Civil Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK.)

  • Simon Rees

    (School of Civil Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK)

  • Iñigo Urra Mardaras

    (Tecnalia, Anardi Industrigunea, 5 E-20730 Azpeitia-Gipuzkoa, Spain)

  • Marina Curto Janó

    (ARC BCN, Pau Claris 97, 08009 Barcelona, Spain)

  • Merche Polo Carbayo

    (Comsa Corporación, Av. Roma 25–27, 08029 Barcelona, Spain)

Abstract

Ground thermal energy is a sustainable source that can substantially reduce our dependency on conventional fuels for heating and cooling of buildings. To exploit this source, foundation sub-structures with embedded heat exchanger pipes are employed. Diaphragm wall heat exchangers are one such form of ground heat exchangers, where part of the wall is exposed to the basement area of the building on one side, while the other side and the further depth of the wall face the surrounding ground. To assess the thermal performance of diaphragm wall heat exchangers, a model that takes the wall geometry and boundary conditions at the pipe, basement, and ground surfaces into account is required. This paper describes the development of such a model using a weighting factor approach, known as Dynamic Thermal Networks (DTN), that allows representation of the three-dimensional geometry, required boundary conditions, and heterogeneous material properties. The model is validated using data from an extended series of thermal response test measurements at two full-scale diaphragm wall heat exchanger installations in Barcelona, Spain. Validation studies are presented in terms of comparisons between the predicted and measured fluid temperatures and heat transfer rates. The model was found to predict the dynamics of thermal response over a range of operating conditions with good accuracy and using very modest computational resources.

Suggested Citation

  • Ida Shafagh & Simon Rees & Iñigo Urra Mardaras & Marina Curto Janó & Merche Polo Carbayo, 2020. "A Model of a Diaphragm Wall Ground Heat Exchanger," Energies, MDPI, vol. 13(2), pages 1-23, January.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:2:p:300-:d:306196
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    References listed on IDEAS

    as
    1. Florides, Georgios & Kalogirou, Soteris, 2007. "Ground heat exchangers—A review of systems, models and applications," Renewable Energy, Elsevier, vol. 32(15), pages 2461-2478.
    2. Loveridge, Fleur & Powrie, William, 2014. "G-Functions for multiple interacting pile heat exchangers," Energy, Elsevier, vol. 64(C), pages 747-757.
    3. Loveridge, Fleur & Powrie, William, 2013. "Temperature response functions (G-functions) for single pile heat exchangers," Energy, Elsevier, vol. 57(C), pages 554-564.
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    Cited by:

    1. Natalia Rydalina & Elena Antonova & Irina Akhmetova & Svetlana Ilyashenko & Olga Afanaseva & Vincenzo Bianco & Alexander Fedyukhin, 2020. "Analysis of the Efficiency of Using Heat Exchangers with Porous Inserts in Heat and Gas Supply Systems," Energies, MDPI, vol. 13(22), pages 1-13, November.
    2. Hanna Michalak & Paweł Przybysz, 2021. "The Use of 3D Numerical Modeling in Conceptual Design: A Case Study," Energies, MDPI, vol. 14(16), pages 1-21, August.
    3. Wenxiong Xi & Mengyao Xu & Chaoyang Liu & Jian Liu, 2022. "Recent Developments of Heat Transfer Enhancement and Thermal Management Technology," Energies, MDPI, vol. 15(16), pages 1-3, August.

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