Thermal Response Testing Results of Different Types of Borehole Heat Exchangers: An Analysis and Comparison of Interpretation Methods

Angelo Zarrella, Giuseppe Emmi, Samantha Graci, Michele De Carli, Matteo Cultrera, Giorgia Dalla Santa, Antonio Galgaro, David Bertermann, Johannes Müller, Luc Pockelé, Giulia Mezzasalma, Davide Righini, Mario Psyk and Adriana Bernardi
Additional contact information
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
Samantha Graci: 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
Matteo Cultrera: Department of Geoscience, University of Padova, Via Gradenigo 6, 35131 Padova, Italy
Giorgia Dalla Santa: Department of Geoscience, University of Padova, Via Gradenigo 6, 35131 Padova, Italy
Antonio Galgaro: Department of Geoscience, University of Padova, Via Gradenigo 6, 35131 Padova, Italy
David Bertermann: GeoZentrum Nordbayern, Lehrstuhl für Geologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schloßgarten 5, 91054 Erlangen, Germany
Johannes Müller: GeoZentrum Nordbayern, Lehrstuhl für Geologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schloßgarten 5, 91054 Erlangen, Germany
Luc Pockelé: Red Srl, Viale dell’Industria 58/B, 35129 Padova, Italy
Giulia Mezzasalma: Red Srl, Viale dell’Industria 58/B, 35129 Padova, Italy
Davide Righini: Hydra Srl, Via Imperiale 6, Traghetto di Argenta, 44011 Ferrara, Italy
Mario Psyk: Rehau AG & Co, Ytterbium 4, 91058 Erlangen-Eltersdorf, Germany
Adriana Bernardi: CNR-ISAC, Corso Stati Uniti 4, 35127 Padova, Italy

Energies, 2017, vol. 10, issue 6, 1-18

Abstract: The design phase of ground source heat pump systems is an extremely important one as many of the decisions made at that time can affect the system’s energy performance as well as installation and operating costs. The current study examined the interpretation of thermal response testing measurements used to evaluate the equivalent ground thermal conductivity and thus to design the system. All the measurements were taken at the same geological site located in Molinella, Bologna (Italy) where a variety of borehole heat exchangers (BHEs) had been installed and investigated within the project Cheap-GSHPs (Cheap and efficient application of reliable Ground Source Heat exchangers and Pumps) of the European Union’s Horizon 2020 research and innovation program. The measurements were initially analyzed in accordance with the common interpretation based on the first-order approximation of the solution for the infinite line source model and then by utilizing the complete solutions of both the infinite line and cylinder source models. An inverse numerical approach based on a detailed model that considers the current geometry of the BHE and the axial heat transfer as well as the effect of weather on the ground surface was also used. Study findings revealed that the best result was generally obtained using the inverse numerical interpretation.

Keywords: ground source heat pump systems; ground heat exchanger; thermal response test; borehole; coaxial pipes; helical shaped pipe (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: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (21)

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