Estimation of local composition in zeotropic mixtures and its application to heat pump system modeling

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-06-27 DOI:10.1016/j.applthermaleng.2025.127345

Yeonwoo Jeong , Sangwook Lee , Min Soo Kim

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引用次数: 0

Abstract

Refrigerant mixtures have been proposed as alternatives to traditional refrigerants to meet environmental regulations while offering favorable thermodynamic properties. When zeotropic mixtures are utilized in heat pump systems, local composition shift arises from differences in velocity and composition between the liquid and vapor phases in the two-phase region. This phenomenon leads to off-design operation, as the local composition varies along the system, deviating from the initial charge composition. Therefore, it is necessary to consider local composition shift when designing heat pump systems with refrigerant mixtures. In this study, local compositions of mixtures are numerically estimated throughout a heat pump system, and a system model is suggested reflecting these composition shifts. The estimation results indicate good agreement with the experimental data, with maximum root mean squared error (RMSE) of 1.46% for local compositions of R32/R1234yf mixtures. Furthermore, two system models, one considering and one not considering local composition shift, are compared under various operating conditions. The model with composition shift shows improved accuracy, decreasing the mean absolute percentage error (MAPE) of system parameters by up to 5.52%p. Based on this model, the effect of local composition shift on the system is analyzed. Simulation results reveal that composition shift leads to capacity reductions of 3.7% and 7.4% in cooling and heating modes, respectively, under standard conditions of this study.

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共沸混合物中局部成分的估计及其在热泵系统建模中的应用

制冷剂混合物已被提出作为传统制冷剂的替代品，以满足环境法规，同时提供良好的热力学性能。当在热泵系统中使用共沸混合物时，由于两相区域中液相和气相之间的速度和成分的差异，局部成分发生了变化。这种现象导致非设计运行，因为局部成分沿着系统变化，偏离初始电荷组成。因此，在设计含有制冷剂混合物的热泵系统时，有必要考虑局部成分的变化。在本研究中，对整个热泵系统中混合物的局部组成进行了数值估计，并提出了反映这些组成变化的系统模型。结果表明，R32/R1234yf混合物局部组分的最大均方根误差（RMSE）为1.46%，与实验数据吻合较好。在不同工况下，对考虑和不考虑局部成分移位的两种系统模型进行了比较。组合移位模型的精度得到了提高，系统参数的平均绝对百分比误差（MAPE）降低了5.52%。在此模型的基础上，分析了局部成分位移对系统的影响。模拟结果表明，在本研究的标准条件下，组分变化导致冷却和加热模式下的容量分别下降3.7%和7.4%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.