Simulation-Based Comparison Between the Thermal Behavior of Coaxial and Double U-Tube Borehole Heat Exchangers

Davide Quaggiotto, Angelo Zarrella, Giuseppe Emmi, Michele De Carli, Luc Pockelé, Jacques Vercruysse, Mario Psyk, Davide Righini, Antonio Galgaro, Dimitrios Mendrinos and Adriana Bernardi
Additional contact information
Davide Quaggiotto: Department of Industrial Engineering—Applied Physics Section, University of Padova, Via Venezia 1, 35131 Padova, Italy
Angelo Zarrella: Department of Industrial Engineering—Applied Physics Section, University of Padova, Via Venezia 1, 35131 Padova, Italy
Giuseppe Emmi: Department of Industrial Engineering—Applied Physics Section, University of Padova, Via Venezia 1, 35131 Padova, Italy
Michele De Carli: Department of Industrial Engineering—Applied Physics Section, University of Padova, Via Venezia 1, 35131 Padova, Italy
Luc Pockelé: Red Srl, Viale dell’Industria 58/B, 35129 Padova, Italy
Jacques Vercruysse: Geogreen sprl, Rue De Priesmont Marbais 63, 1495 Villers La Ville, Belgium
Mario Psyk: Rehau AG & Co, Ytterbium 4, 91058 Erlangen-Eltersdorf, Germany
Davide Righini: Hydra Srl, Via Imperiale 6, Traghetto di Argenta, 44011 Ferrara, Italy
Antonio Galgaro: Department of Geoscience, University of Padova, Via Gradenigo 6, 35131 Padova, Italy
Dimitrios Mendrinos: Centre for Renewable Energy Sources and Saving, Marathonos 19th km, 19009 Pikérmi, Greece
Adriana Bernardi: CNR-ISAC, Corso Stati Uniti 4, 35127 Padova, Italy

Energies, 2019, vol. 12, issue 12, 1-18

Abstract: In this study, the thermal behavior of the coaxial and double U borehole heat exchangers was investigated using numerical simulations in both the long- and short-term. As a reference for borehole heat exchanger specifications, the existing coaxial and double U probes of a geothermal heat pump installed within the Horizon 2020 research project named “Cheap GSHPs” were considered. Nine years of simulations revealed that when borehole heat exchangers are subjected to a balanced thermal load, and intermittent operating modes of the ground source heat pump system are set, the coaxial pipes’ configuration provides better thermal performance due to the higher thermal capacitance of the heat-carrier fluid and the lower borehole thermal resistance. The analysis was conducted considering two different types of ground with different thermal conductivity values. As result, the more conductive ground type highlights the higher yield of the coaxial probe.

Keywords: ground source heat pump systems; ground heat exchanger; coaxial pipes; double U-tube; heat transfer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (14)

Downloads: (external link)
https://www.mdpi.com/1996-1073/12/12/2321/pdf (application/pdf)
https://www.mdpi.com/1996-1073/12/12/2321/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:12:y:2019:i:12:p:2321-:d:240612

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().