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Energies 2017, 10(6), 801; doi:10.3390/en10060801

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

1
Department of Industrial Engineering—Applied Physics Section, University of Padova, Via Venezia 1, 35131 Padova, Italy
2
Department of Geoscience, University of Padova, Via Gradenigo 6, 35131 Padova, Italy
3
GeoZentrum Nordbayern, Lehrstuhl für Geologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schloßgarten 5, 91054 Erlangen, Germany
4
Red Srl, Viale dell’Industria 58/B, 35129 Padova, Italy
5
Hydra Srl, Via Imperiale 6, Traghetto di Argenta, 44011 Ferrara, Italy
6
Rehau AG & Co, Ytterbium 4, 91058 Erlangen-Eltersdorf, Germany
7
CNR-ISAC, Corso Stati Uniti 4, 35127 Padova, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Tariq Al-Shemmeri
Received: 13 April 2017 / Revised: 7 June 2017 / Accepted: 10 June 2017 / Published: 13 June 2017
(This article belongs to the Special Issue Low Enthalpy Geothermal Energy)
View Full-Text   |   Download PDF [6089 KB, uploaded 13 June 2017]   |  

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. View Full-Text
Keywords: ground source heat pump systems; ground heat exchanger; thermal response test; borehole; coaxial pipes; helical shaped pipe ground source heat pump systems; ground heat exchanger; thermal response test; borehole; coaxial pipes; helical shaped pipe
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zarrella, A.; Emmi, G.; Graci, S.; De Carli, M.; Cultrera, M.; Santa, G.D.; Galgaro, A.; Bertermann, D.; Müller, J.; Pockelé, L.; Mezzasalma, G.; Righini, D.; Psyk, M.; Bernardi, A. Thermal Response Testing Results of Different Types of Borehole Heat Exchangers: An Analysis and Comparison of Interpretation Methods. Energies 2017, 10, 801.

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