Transient refrigerant distribution in a microchannel heat exchanger heat pump system under different reverse cycle defrosting strategies
Open accessAbstract
The migration and redistribution of refrigerant are critical factors that affect the refrigeration system performance. To improve the defrosting and start-up heating performance, it is essential to investigate the transient distribution characteristics of refrigerant mass. However, quantitative studies on the transient distribution of refrigerant during defrosting and start-up heating stages in heat pump systems are scarce. The dynamic characteristics of defrosting and start-up heating cannot be deeply understood from the perspective of refrigerant migration. Therefore, the purpose of this paper is to experimentally study the transient distribution characteristics of refrigerants during defrosting and start-up heating stages for different defrosting strategies. Based on the refrigerant-side dynamic characteristics, the defrosting cycle is divided into three stages for the defrosting strategy with the indoor fan off, the indoor coil charging stage, accumulator charging stage, and wet compression stage. Additionally, for the defrosting strategy with the indoor fan on, it is divided into two stages: the indoor coil charging stage and the outdoor coil discharging stage. For the defrosting strategy with the indoor fan off, the wet compression phenomenon occurs at 240 s, which poses significant challenges to the stability of the compressor. At the end of defrosting, the accumulator retains the most refrigerant for both defrosting strategies. From the perspective of refrigerant transient distribution, the start-up heating stage is the process of refrigerant migration from the accumulator to indoor and outdoor coils. The two main factors that affect start-up heating performance are heating the indoor coil metal, and vaporizing the liquid refrigerant in the accumulator. For the defrosting strategy with indoor fan on, the energy consumption of heating the indoor coil and vaporizing the liquid refrigerant is reduced by 45.7 % and 48.9 % during start-up heating. Based on the transient refrigerant distribution experiment, some methods to improve defrosting and start-up heating are also proposed. This study can provide useful insights into the transient distribution of refrigerants and provide guidance for defrosting optimization.
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Cites
Describing the uncertainties in experimental results
Moffat, R. J. (1988) · Experimental Thermal and Fluid Science · doi:10.1016/0894-1777(88)90043-x · Cited by 9,860 · see citing works
How China could be carbon neutral by mid-century
Mallapaty, S. (2020) · Nature · doi:10.1038/d41586-020-02927-9 · Cited by 1,068 · see citing works
Heat pumps and our low-carbon future: A comprehensive review
Gaur, A. S., Fitiwi, D. Z., & Curtis, J. A. (2020) · Energy Research & Social Science · doi:10.1016/j.erss.2020.101764 · Cited by 443 · see citing works
Review on improvement for air source heat pump units during frosting and defrosting
Song, M., Deng, S., Dang, C., Mao, N., & Wang, Z. (2018) · Applied Energy · doi:10.1016/j.apenergy.2017.12.022 · Cited by 384 · see citing works
Amer, M., & Wang, C.-C. (2017) · Renewable and Sustainable Energy Reviews · doi:10.1016/j.rser.2017.01.120 · Cited by 218 · see citing works
Refrigerant charge in refrigerating systems and strategies of charge reduction
Poggi, F., Macchi-Tejeda, H., Leducq, D., & Bontemps, A. (2007) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2007.05.014 · Cited by 181 · see citing works
Xia, Y., Zhong, Y., Hrnjak, P. S., & Jacobi, A. M. (2006) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2006.03.005 · Cited by 148 · see citing works
Transient modeling of a flash tank vapor injection heat pump system – Part I: Model development
Qiao, H.-T., Aute, V., & Radermacher, R. (2015) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2014.06.019 · Cited by 125 · see citing works
Heat pumps and solar energy: A review with some insights in the future
Lazzarin, R. M. (2020) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2020.03.031 · Cited by 122 · see citing works
Determination method of defrosting start-time based on temperature measurements
Kim, M.-H., & Lee, K.-S. (2015) · Applied Energy · doi:10.1016/j.apenergy.2015.02.071 · Cited by 79 · see citing works
Xu, B., Zhang, C., Wang, Y., Chen, J., Xu, K., Li, F., & Wang, N. (2015) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2015.06.037 · Cited by 69 · see citing works
Refrigerant mass charge distribution in a domestic refrigerator, Part I: Transient conditions
Björk, E., & Palm, B. E. (2005) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2005.10.003 · Cited by 67 · see citing works
Parametric analysis of the defrosting process of a reversible heat pump system for electric vehicles
Steiner, A., & Rieberer, R. (2013) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2013.07.044 · Cited by 58 · see citing works
Song, M., Xie, G., Pekař, L., Mao, N., & Qu, M. (2020) · Energy and Buildings · doi:10.1016/j.enbuild.2020.110257 · Cited by 53 · see citing works
Measurement of refrigerant mass distribution within a R290 split air conditioner
Li, T., Lu, J. F., Chen, L., He, D., Qiu, X., Li, H., & Liu, Z. (2015) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2015.05.012 · Cited by 53 · see citing works
Modeling of frost layer growth considering frost porosity
Lee, J., Kim, J., Kim, D. R., & Lee, K.-S. (2018) · International Journal of Heat and Mass Transfer · doi:10.1016/j.ijheatmasstransfer.2018.05.098 · Cited by 52 · see citing works
Qiao, H., Aute, V., & Radermacher, R. (2018) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2017.12.017 · Cited by 46 · see citing works
Klingebiel, J., Hassan, M., Venzik, V., Vering, C., & Müller, D. (2023) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2023.121072 · Cited by 44 · see citing works
Chen, R., Wu, J., & Duan, J. (2019) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2019.114225 · Cited by 38 · see citing works
Refrigerant charge distribution in brine-to-water heat pump using R290 as refrigerant
Sánchez-Moreno-Giner, L., Methler, T., Barceló-Ruescas, F., & Gonzálvez-Maciá, J. (2022) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2022.10.013 · Cited by 37 · see citing works
Xiong, T., Ying, Y., Han, B., Yan, G., & Yu, J. (2021) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2021.09.003 · Cited by 35 · see citing works
Self-citationDetailed dynamic refrigerant migration characteristics in room air-conditioner with R290.
Liang, J.-R., & Li, T.-X. (2017) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2017.12.013 · Cited by 35 · see citing works
Refrigerant mass charge distribution in a domestic refrigerator. Part II: steady state conditions
Björk, E., & Palm, B. E. (2005) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2005.10.004 · Cited by 34 · see citing works
Wang, A., Yin, X., Fang, J., & Cao, F. (2021) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2021.06.009 · Cited by 32 · see citing works
Refrigerant mass migration modeling and simulation for air conditioning systems
Li, B., Peuker, S., Hrnjak, P. S., & Alleyne, A. G. (2011) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2011.02.022 · Cited by 29 · see citing works
Refrigerant migration during startup of a split air conditioner in heating mode
Han, B., Yan, G. F., & Yu, J. (2018) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2018.11.126 · Cited by 29 · see citing works
Self-citationPractical methods for measuring refrigerant mass distribution inside refrigeration system
Ding, G., Ma, X., Zhang, P., Han, W., Kasahara, S., & Yamaguchi, T. (2008) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2008.05.002 · Cited by 28 · see citing works
A simple technique for refrigerant mass measurement
Björk, E. (2004) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2004.09.008 · Cited by 26 · see citing works
Li, J., Deng, W., & Yan, G. F. (2017) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2017.08.151 · Cited by 23 · see citing works
Self-citationXiong, T., Chen, Q., Xu, S., Liu, G., Gao, Q., & Yan, G. (2024) · Energy · doi:10.1016/j.energy.2023.129968 · Cited by 21 · see citing works
Self-citationWu, C., Wang, Z., Li, X., Xu, Z., Xu, C., Yang, Y., Zhao, W., & Wang, Y. (2022) · Journal of Building Engineering · doi:10.1016/j.jobe.2022.105628 · Cited by 17 · see citing works
Liang, J.-R., Zhu, T.-T., Sun, L., Wang, H., & Li, T.-X. (2022) · Energy Conversion and Management · doi:10.1016/j.enconman.2022.115908 · Cited by 16 · see citing works
Lei, B., Wang, C., Duan, J., Du, Y., Wu, J., & Li, X. (2022) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2022.01.021 · Cited by 16 · see citing works
Han, B., Xiong, T., Xu, S., Liu, G., & Yan, G. F. (2021) · Energy · doi:10.1016/j.energy.2021.121658 · Cited by 13 · see citing works
Self-citationWesthaeuser, J., Schulze, C., Albrecht, J.-C., Tegethoff, W., Lemke, N., & Koehler, J. (2023) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2023.120140 · Cited by 12 · see citing works
Li, W., & Hrnjak, P. (2021) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2021.04.012 · Cited by 12 · see citing works
Guzzardi, C., Azzolin, M., Lazzarato, S., & Col, D. D. (2022) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2022.03.006 · Cited by 9 · see citing works
Xiong, T., Liu, G., Wang, S., Yan, G. F., & Yu, J. (2023) · Journal of Building Engineering · doi:10.1016/j.jobe.2023.106537 · Cited by 5 · see citing works
Self-citation
Flagged first, then by citations
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Cited by
Sorted by citations
Yuan, C., Liu, H., Li, W., Song, J., Liu, Z., & Li, H. (2025) · International Journal of Heat and Fluid Flow · doi:10.1016/j.ijheatfluidflow.2025.109828 · Cited by 5 · see citing works
Indoor thermal comfort analysis during dynamic frosting-defrosting process of air source heat pumps
Wang, W., Ren, J., Tan, Y., Luo, Z., Wei, W., Jin, X., Sun, Y., & Zhang, C. (2025) · Building and Environment · doi:10.1016/j.buildenv.2025.114100 · Cited by 4 · see citing works
Chen, H., Wang, T., Zheng, P., Yang, P., & Liu, Y. (2025) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2025.07.002 · Cited by 2 · see citing works
Gao, P., Liu, Y., Dong, Q., Zhao, F.-F., Ji, W., & Tao, W. (2026) · Experimental Heat Transfer · doi:10.1080/08916152.2026.2662648
- Authors
- Xiong, T., Hu, L., Liu, G., & Yan, G.
- Affiliations
- Xi'an Jiaotong University (CN)
- Corresponding author
- Liu, Guoqiang
- Venue
- Case Studies in Thermal Engineering
- Publisher
- Elsevier BV
- Published
- 2024-09
- Volume
- 61
- Pages
- 105069
- ISSN
- 2214-157X (ISSN-L)
- OpenAlex
- W4402127566
- Cited by
- 4
- References
- 39
- Citations by year
- 2026: 1 · 2025: 3
- FWCI
- 0.54
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Case Studies in Thermal Engineering (publishedVersion, cc-by-nc-nd)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Natural Science Foundation of China (52306021)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Refrigeration and Air Conditioning Technologies
- Physical Sciences › Engineering › Mechanical Engineering › Adsorption and Cooling Systems
- Physical Sciences › Engineering › Mechanical Engineering › Heat Transfer and Boiling Studies
- Keywords
- microchannel heat exchangers, heat pumps, refrigerant distribution, wet compression
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