On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers
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 se...
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| Format: | Article |
| Language: | English |
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MDPI AG
2017-09-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/10/9/1328 |
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| author | Borja Badenes Miguel Ángel Mateo Pla Lenin G. Lemus-Zúñiga Begoña Sáiz Mauleón Javier F. Urchueguía |
| author_facet | Borja Badenes Miguel Ángel Mateo Pla Lenin G. Lemus-Zúñiga Begoña Sáiz Mauleón Javier F. Urchueguía |
| author_sort | Borja Badenes |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T22:21:55Z |
| format | Article |
| id | doaj.art-73e881bc1ff045699cf678a55979b084 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T22:21:55Z |
| publishDate | 2017-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-73e881bc1ff045699cf678a55979b0842022-12-22T04:00:03ZengMDPI AGEnergies1996-10732017-09-01109132810.3390/en10091328en10091328On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat ExchangersBorja Badenes0Miguel Ángel Mateo Pla1Lenin G. Lemus-Zúñiga2Begoña Sáiz Mauleón3Javier F. Urchueguía4Instituto de Aplicaciones de las Comunicaciones Avanzadas (ITACA), Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, SpainInstituto de Aplicaciones de las Comunicaciones Avanzadas (ITACA), Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, SpainInstituto de Aplicaciones de las Comunicaciones Avanzadas (ITACA), Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, SpainEscuela Técnica Superior de Ingeniería del Diseño (ETSID), Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, SpainInstituto de Aplicaciones de las Comunicaciones Avanzadas (ITACA), Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, SpainThermal 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.https://www.mdpi.com/1996-1073/10/9/1328borehole heat exchangerthermal response test (TRT)ground-source heat pumpinfinite line-source modelfinite line-source model |
| spellingShingle | Borja Badenes Miguel Ángel Mateo Pla Lenin G. Lemus-Zúñiga Begoña Sáiz Mauleón Javier F. Urchueguía On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers Energies borehole heat exchanger thermal response test (TRT) ground-source heat pump infinite line-source model finite line-source model |
| title | On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers |
| title_full | On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers |
| title_fullStr | On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers |
| title_full_unstemmed | On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers |
| title_short | On the Influence of Operational and Control Parameters in Thermal Response Testing of Borehole Heat Exchangers |
| title_sort | on the influence of operational and control parameters in thermal response testing of borehole heat exchangers |
| topic | borehole heat exchanger thermal response test (TRT) ground-source heat pump infinite line-source model finite line-source model |
| url | https://www.mdpi.com/1996-1073/10/9/1328 |
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