Details
| Original language | English |
|---|---|
| Pages (from-to) | 107-116 |
| Number of pages | 10 |
| Journal | Propulsion and Power Research |
| Volume | 6 |
| Issue number | 2 |
| Early online date | 23 Jun 2017 |
| Publication status | Published - Jun 2017 |
Abstract
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.
Keywords
- Dynamic simulation, Experimental validation, Falling film evaporation, Geothermal heat pump, Geothermal thermosyphon, Two-phase closed thermosyphon (TPCT)
ASJC Scopus subject areas
- Psychology(all)
- Social Psychology
- Psychology(all)
- Developmental and Educational Psychology
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In: Propulsion and Power Research, Vol. 6, No. 2, 06.2017, p. 107-116.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Dynamic simulation and experimental validation of a two-phase closed thermosyphon for geothermal application
AU - Ebeling, Johann-Christoph
AU - Luo, Xing
AU - Kabelac, Stephan
AU - Luckmann, Sebastian
AU - Kruse, Horst
N1 - Funding Information: The present research work was supported by the Federal Ministry for Economic Affairs and Energy of Germany under the funding code FKZ: 03ET1050B. Furthermore we would like to thank our research partners: GeoDienste, U+B Wöltjen and the Institute of Thermal Separation Processes of TUHH, as well as the companies: Viessmann and Stiebel Eltron, who have supported the project by providing one heat pump each. Image 1 Publisher Copyright: © 2017 National Laboratory for Aeronautics and Astronautics Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/6
Y1 - 2017/6
N2 - 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.
AB - 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.
KW - Dynamic simulation
KW - Experimental validation
KW - Falling film evaporation
KW - Geothermal heat pump
KW - Geothermal thermosyphon
KW - Two-phase closed thermosyphon (TPCT)
UR - http://www.scopus.com/inward/record.url?scp=85027728209&partnerID=8YFLogxK
U2 - 10.1016/j.jppr.2017.05.002
DO - 10.1016/j.jppr.2017.05.002
M3 - Article
AN - SCOPUS:85027728209
VL - 6
SP - 107
EP - 116
JO - Propulsion and Power Research
JF - Propulsion and Power Research
SN - 2212-540X
IS - 2
ER -