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Energies 2017, 10(9), 1328; https://doi.org/10.3390/en10091328

On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers

1
Instituto de Aplicaciones de las Comunicaciones Avanzadas (ITACA), Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, Spain
2
Escuela Técnica Superior de Ingeniería del Diseño (ETSID), Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, Spain
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 21 July 2017 / Revised: 29 August 2017 / Accepted: 30 August 2017 / Published: 3 September 2017
(This article belongs to the Special Issue Low Enthalpy Geothermal Energy)
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Abstract

Thermal response test (TRT) is a common procedure for characterization of ground and borehole thermal properties needed for the design of a shallow geothermal heat pump system. In order to investigate and to develop more accurate and robust procedures for TRT control, modelling, and evaluation in semi-permeable soils with large water content, a pilot borehole heat exchanger was built in the main campus of the Universitat Politècnica de València. The present work shows the results of the experiments performed at the site, analysing the improvements that have been introduced both in the control of the heat injected during TRTs and in the methods to infer the ground thermal parameter. Three models are compared: two based on the infinite-line source theory and one based on the finite-line source scheme. The models were tested under two possible configurations of the equipment, i.e., with and without strict control of injected heat. Our results show the importance of heat injection control for a robust parameter assessment and the existence of additional heat transfer processes that the used models cannot completely characterize and that are related to the presence of significant groundwater flow at the site. In addition, our experience with the current installation and the knowledge about its strengths and weaknesses have allowed us to design a new and more complete test-site to help in the analysis and validation of new ground heat exchanger geometries. View Full-Text
Keywords: borehole heat exchanger; thermal response test (TRT); ground-source heat pump; infinite line-source model; finite line-source model borehole heat exchanger; thermal response test (TRT); ground-source heat pump; infinite line-source model; finite line-source model
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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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Badenes, B.; Mateo Pla, M.Á.; Lemus-Zúñiga, L.G.; Sáiz Mauleón, B.; Urchueguía, J.F. On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers. Energies 2017, 10, 1328.

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