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An advanced moving-boundary method for the dynamic simulation of split heat pump system under start-up process

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  • Du, Yanjun
  • Zhao, Tian
  • Lin, Jie
  • Wu, Yuting
  • Wang, Che
  • Wu, Jianhua

Abstract

This paper proposed a more advanced moving-boundary method for establishing dynamic mathematical models of heat exchangers based on the dynamic characteristics of split type heat pump systems with low charge. On the basis of the traditional sub-model, two phase model (non-linear) and two phase-liquid model have been added for the condenser, and vapor model (linear) and vapor model (non-linear) model have been added for the evaporator. Based on the characteristics of split type heat pumps, this article introduced a detailed method for setting initial boundary conditions under refrigeration and heating conditions. At the same time, this article proposed more rigorous algorithm for model switching and a method for calculating the initial phase length, which will improve the robustness and computational speed of the system model. The model proposed of a split heat pump achieves dynamic numerical simulation of the entire process from start-up to stability. In addition, the system model was validated and error analysed by building an experimental platform and conducting data analysis. Finally, the dynamic characteristics of fixed frequency start-up operation and variable frequency start-up operation were discussed.

Suggested Citation

  • Du, Yanjun & Zhao, Tian & Lin, Jie & Wu, Yuting & Wang, Che & Wu, Jianhua, 2025. "An advanced moving-boundary method for the dynamic simulation of split heat pump system under start-up process," Applied Energy, Elsevier, vol. 388(C).
    • Handle: RePEc:eee:appene:v:388:y:2025:i:c:s0306261925004039
    DOI: 10.1016/j.apenergy.2025.125673
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    References listed on IDEAS

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    1. Majumdar, Rudrodip & Singh, Suneet & Saha, Sandip K., 2018. "Quasi-steady state moving boundary reduced order model of two-phase flow for ORC refrigerant in solar-thermal heat exchanger," Renewable Energy, Elsevier, vol. 126(C), pages 830-843.
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    5. Arpagaus, Cordin & Bless, Frédéric & Uhlmann, Michael & Schiffmann, Jürg & Bertsch, Stefan S., 2018. "High temperature heat pumps: Market overview, state of the art, research status, refrigerants, and application potentials," Energy, Elsevier, vol. 152(C), pages 985-1010.
    6. Diaconu, Bogdan M. & Varga, Szabolcs & Oliveira, Armando C., 2011. "Numerical simulation of a solar-assisted ejector air conditioning system with cold storage," Energy, Elsevier, vol. 36(2), pages 1280-1291.
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