Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application

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Ebeling, J.-C.; Luo, X.; Kabelac, S.; Luckmann, S.; Kruse, H.: Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application. In: Psychology of Learning and Motivation - Advances in Research and Theory 67 (2017), S. 107-116. DOI: https://doi.org/10.1016/j.jppr.2017.05.002

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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.
License of this version: CC BY-NC-ND 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2017
Appears in Collections:Fakultät für Maschinenbau

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pos. country downloads
total perc.
1 image of flag of Germany Germany 164 55.78%
2 image of flag of United States United States 34 11.56%
3 image of flag of China China 14 4.76%
4 image of flag of No geo information available No geo information available 6 2.04%
5 image of flag of France France 6 2.04%
6 image of flag of Canada Canada 6 2.04%
7 image of flag of Russian Federation Russian Federation 5 1.70%
8 image of flag of Algeria Algeria 5 1.70%
9 image of flag of Japan Japan 4 1.36%
10 image of flag of India India 4 1.36%
    other countries 46 15.65%

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