Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application
The heat transfer performance of a vertical two-phase closed thermosyphon (TPCT) used in a geothermal heat pump was experimentally investigated. The TPCT is a vertical plain steel pipe with inner diameter of 114 mm and bored 368 m deep underground. Carbon dioxide (CO2) is used as working fluid. In t...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2017-06-01
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| Series: | Propulsion and Power Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212540X17300214 |
| _version_ | 1797758293217640448 |
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| author | Johann-Christoph Ebeling Xing Luo Stephan Kabelac Sebastian Luckmann Horst Kruse |
| author_facet | Johann-Christoph Ebeling Xing Luo Stephan Kabelac Sebastian Luckmann Horst Kruse |
| author_sort | Johann-Christoph Ebeling |
| collection | DOAJ |
| description | The heat transfer performance of a vertical two-phase closed thermosyphon (TPCT) used in a geothermal heat pump was experimentally investigated. The TPCT is a vertical plain steel pipe with inner diameter of 114 mm and bored 368 m deep underground. Carbon dioxide (CO2) is used as working fluid. In the TPCT there is no condensation section. CO2 is condensed by the evaporator of the heat pump, flows into the head of the TPCT and runs down as a falling film along the inner wall of the pipe. For the heat transfer simulation in the TPCT, a quasi-dynamic model in which the mass transfer between the liquid and vapor phases as well as the conduction heat transfer from the surrounding soil towards the pipe is treated dynamically. However the film flow modeling is based on the Nusselt theory of film condensation. The comparison of the experimental data with the numerical simulation is presented and discussed. |
| first_indexed | 2024-03-12T18:27:53Z |
| format | Article |
| id | doaj.art-469e74449a374e77bb5debe2961d0ee9 |
| institution | Directory Open Access Journal |
| issn | 2212-540X |
| language | English |
| last_indexed | 2024-03-12T18:27:53Z |
| publishDate | 2017-06-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Propulsion and Power Research |
| spelling | doaj.art-469e74449a374e77bb5debe2961d0ee92023-08-02T08:26:54ZengKeAi Communications Co., Ltd.Propulsion and Power Research2212-540X2017-06-016210711610.1016/j.jppr.2017.05.002Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal applicationJohann-Christoph Ebeling0Xing Luo1Stephan Kabelac2Sebastian Luckmann3Horst Kruse4Institute for Thermodynamics, Leibniz University of Hannover, Callinstraße 36, 30167 Hannover, GermanyInstitute for Thermodynamics, Leibniz University of Hannover, Callinstraße 36, 30167 Hannover, GermanyInstitute for Thermodynamics, Leibniz University of Hannover, Callinstraße 36, 30167 Hannover, GermanyForschungszentrum für Kältetechnik und Wärmepumpen GmbH, Weidendamm 14, 30167 Hannover, GermanyForschungszentrum für Kältetechnik und Wärmepumpen GmbH, Weidendamm 14, 30167 Hannover, GermanyThe heat transfer performance of a vertical two-phase closed thermosyphon (TPCT) used in a geothermal heat pump was experimentally investigated. The TPCT is a vertical plain steel pipe with inner diameter of 114 mm and bored 368 m deep underground. Carbon dioxide (CO2) is used as working fluid. In the TPCT there is no condensation section. CO2 is condensed by the evaporator of the heat pump, flows into the head of the TPCT and runs down as a falling film along the inner wall of the pipe. For the heat transfer simulation in the TPCT, a quasi-dynamic model in which the mass transfer between the liquid and vapor phases as well as the conduction heat transfer from the surrounding soil towards the pipe is treated dynamically. However the film flow modeling is based on the Nusselt theory of film condensation. The comparison of the experimental data with the numerical simulation is presented and discussed.http://www.sciencedirect.com/science/article/pii/S2212540X17300214Two-phase closed thermosyphon (TPCT)Geothermal thermosyphonFalling film evaporationGeothermal heat pumpDynamic simulationExperimental validation |
| spellingShingle | Johann-Christoph Ebeling Xing Luo Stephan Kabelac Sebastian Luckmann Horst Kruse Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application Propulsion and Power Research Two-phase closed thermosyphon (TPCT) Geothermal thermosyphon Falling film evaporation Geothermal heat pump Dynamic simulation Experimental validation |
| title | Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application |
| title_full | Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application |
| title_fullStr | Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application |
| title_full_unstemmed | Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application |
| title_short | Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application |
| title_sort | dynamic simulation and experimental validation of a two phase closed thermosyphon for geothermal application |
| topic | Two-phase closed thermosyphon (TPCT) Geothermal thermosyphon Falling film evaporation Geothermal heat pump Dynamic simulation Experimental validation |
| url | http://www.sciencedirect.com/science/article/pii/S2212540X17300214 |
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