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

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

Applied Energy, 2025, vol. 388, issue C, No S0306261925004039

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.

Keywords: Heat pump; Moving-boundary method; Dynamic simulation; Low-charge system (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261925004039
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:388:y:2025:i:c:s0306261925004039

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2025.125673

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().