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Design Calculation and Performance Test of the Evaporator-Condenser for Direct Heat Transfer between Heat Pipe and Heat Pump
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Weijie Lin1, 2, 3, 4, Jiwen Cen1, 2, 3, 4, Abdullah Hassan1, 2, 3, 4, Fangming Jiang1, 2, 3, 4
Journal of Refrigeration | 2025, 46(5) : 105 - 114
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Journal of Refrigeration | 2025, 46(5): 105-114
Design Calculation and Performance Test of the Evaporator-Condenser for Direct Heat Transfer between Heat Pipe and Heat Pump
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Weijie Lin1, 2, 3, 4, Jiwen Cen1, 2, 3, 4, Abdullah Hassan1, 2, 3, 4, Fangming Jiang1, 2, 3, 4
Affiliations
  • 1.School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou, 510640, China
  • 2.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), Guangzhou, 510640, China
  • 3.CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences (CAS), Guangzhou, 510640, China
  • 4.Guangdong Provincial Key Laboratory of Renewable Energy, Guangzhou, 510640, China
Published: 2025-10-16 doi: 10.12465/j.issn.0253-4339.2025.05.105
Outline
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The combination of a super-long gravity heat pipe and a heat pump system for harvesting deep geothermal heat has the advantages of low cost, high efficiency, and no groundwater contamination. Direct heat exchange between the evaporator of the heat pump system and the condenser of the gravity heat pipe can simplify the heat exchange process and improve the heating efficiency of the system. Therefore, a U-shaped evaporator-condenser was developed, and its heat transfer performance was studied by building an experimental platform combining a heat pump and a heat pipe. Notably, the heat transfer coefficient of the U-shaped evaporator-condenser reached 2 037.92 W/(m2·℃) when the working fluid on the heat pump side passed through the tube. Based on the homogeneous flow model, a one-dimensional steady-state evaporator-condenser heat transfer model was established by integrating the mass, energy, and momentum conservation equations with empirical formulas for condensation outside the tube and boiling heat transfer inside the tube. Using Python, the simulation results were compared with experimental data. Notably, the average deviation of the heat transfer in the evaporator-condenser was 18.91%, confirming the accuracy of the model and providing a theoretical calculation method for designing an efficient evaporator-condenser.

direct heat transfer between heat pipe and heat pump  /  evaporator-condenser  /  double-side two-phase flow heat transfer  /  heat transfer performance
Weijie Lin, Jiwen Cen, Abdullah Hassan, Fangming Jiang. Design Calculation and Performance Test of the Evaporator-Condenser for Direct Heat Transfer between Heat Pipe and Heat Pump[J]. Journal of Refrigeration, 2025 , 46 (5) : 105 -114 . DOI: 10.12465/j.issn.0253-4339.2025.05.105
Funding
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  • National Key Research and Development Program(2021YFB1507304)
Appendix
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Year 2025 volume 46 Issue 5
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Article Info
doi: 10.12465/j.issn.0253-4339.2025.05.105
  • Receive Date：2024-04-17
  • Online Date：2026-03-13
  • Published：2025-10-16
Article Data
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History
  • Received：2024-04-17
  • Revised：2024-08-24
  • Accepted：2024-08-26
Funding
National Key Research and Development Program(2021YFB1507304)
Affiliations
    1.School of Energy Science and Engineering, University of Science and Technology of China, Guangzhou, 510640, China
    2.Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), Guangzhou, 510640, China
    3.CAS Key Laboratory of Renewable Energy, Chinese Academy of Sciences (CAS), Guangzhou, 510640, China
    4.Guangdong Provincial Key Laboratory of Renewable Energy, Guangzhou, 510640, China

Corresponding:

Cen Jiwen, male, associate researcher, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), 86-13751728426, E-mail: . Research fields: development and utilization of geothermal energy.
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