热泵系统中制冷剂混合物的局部成分变化及其对冷却性能的影响

IF 9.9 1区工程技术 Q1 ENERGY & FUELS

Energy Conversion and Management Pub Date : 2025-04-17 DOI:10.1016/j.enconman.2025.119809

Yeonwoo Jeong , Sangwook Lee , Min Soo Kim

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引用次数: 0

摘要

制冷剂混合物通过成分调整提供可变的热力学性质。然而，当制冷剂混合物应用于热泵系统时，局部成分发生变化，导致系统内的成分与充注成分不同。这种现象主要是由于换热器两相区液体和蒸汽之间的速度差造成的。在本研究中，对蒸发器的局部成分进行了实验测量。以R32/R1234yf混合料为研究对象，分析了系统参数对物料组成、压缩机转速和蒸发器水温的影响。在液态和气态制冷剂混合物中观察到显著的局部成分变化，表现出更大的成分差异。此外，较低的压缩机转速和较低的水温的运行条件进一步加剧了这种现象。当压缩机转速为1000 rpm时，在蒸发器出口附近会发生9.0% p的最显著的局部成分变化。由于局部成分的变化，由于R1234yf的比例增加，两相区域的平均制冷剂温度升高，降低了蒸发器内的换热速率。为了研究局部成分移位对换热器冷却性能的影响，建立了换热器的数值模型，并对有无局部成分移位时的制冷量进行了比较。模拟结果表明，由于局部成分移位，冷却能力降低了4.2%。

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Local composition shift of refrigerant mixtures and its effect on cooling performance in a heat pump system

Refrigerant mixtures provide variable thermodynamic properties through composition adjustment. However, when refrigerant mixtures are applied to heat pump systems, local composition shifts occur, resulting in different compositions within the system from the charge composition. This phenomenon is mainly caused by the velocity difference between liquid and vapor in the two-phase regions of heat exchangers. In this study, the local compositions in the evaporator are experimentally measured. The effects of system parameters on composition shift, such as charge composition, compressor speed, and water temperature in the evaporator, are analyzed using R32/R1234yf mixtures. Significant local composition shifts are observed with refrigerant mixtures exhibiting greater composition differences between the liquid and vapor phases. In addition, operating conditions of lower compressor speeds and lower water temperatures further intensify this phenomenon. With a compressor speed of 1000 rpm, the most considerable local composition shift of 9.0 %p occurs near the evaporator outlet. As a result of local composition shift, the average refrigerant temperature in the two-phase regions is elevated due to a higher proportion of R1234yf, degrading the heat transfer rate in the evaporator. To investigate its effect on cooling performance, a numerical model of the heat exchanger is established, and the cooling capacities with and without local composition shift are compared. Simulation results reveal cooling capacity decreases by up to 4.2 % due to local composition shift.

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来源期刊

Energy Conversion and Management 工程技术-力学

CiteScore

19.00

自引率

11.50%

发文量

1304

审稿时长

17 days

期刊介绍： The journal Energy Conversion and Management provides a forum for publishing original contributions and comprehensive technical review articles of interdisciplinary and original research on all important energy topics. The topics considered include energy generation, utilization, conversion, storage, transmission, conservation, management and sustainability. These topics typically involve various types of energy such as mechanical, thermal, nuclear, chemical, electromagnetic, magnetic and electric. These energy types cover all known energy resources, including renewable resources (e.g., solar, bio, hydro, wind, geothermal and ocean energy), fossil fuels and nuclear resources.