Theoretical investigation and comparative analysis of the Linde-Hampson refrigeration system using eco-friendly zeotropic refrigerants based on R744/R1234ze(Z) for freezing process applications
Theoretical investigation and comparative analysis of the Linde-Hampson refrigeration system using eco-friendly zeotropic refrigerants based on R744/R1234ze(Z) for freezing process applications
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DOI：
10.1016/j.ijrefrig.2022.09.036
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发表时间：
2022-10
影响因子：
3.9
通讯作者：
Zhen Zhao;Jielin Luo;Qi Song;Kaiyin Yang;Qin Wang;Guangming Chen
中科院分区：
文献类型：
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作者：
Zhen Zhao;Jielin Luo;Qi Song;Kaiyin Yang;Qin Wang;Guangming Chen
对采用多种环保共沸工质的林德-汉普森制冷系统进行了理论模拟和热力学分析，比较了在-45℃~-25℃的冷态空间温度下的最优COP、体积制冷量和不可逆性分布，并将遗传算法应用于林德-汉普森制冷系统的全局优化，找出了最优运行压力和混合工质配比。通过比较，最有潜力的二元工质和三元工质分别为R744/R1234ze(Z)和R744/R1234ze(E)/R1234ze(Z)。三元工质的温度滑移主要受中沸点组分和高沸点组分的比例调节。共沸制冷剂的温度滑移应与热源之间的温度跨度很好地匹配，因为匹配程度对系统性能起着至关重要的作用，可作为混合制冷剂选择的重要依据。与R744双级压缩跨临界制冷系统和采用R744和R1234yf的复叠式制冷系统的比较结果表明，采用合适的混合工质的Linde-Hampson系统可以获得最大的COP，可以作为一种补充和替代。研究结果将为林德-汉普森制冷系统在冷冻过程中应用环保、安全、高效的共沸制冷剂提供参考。
The theoretical simulation and thermodynamic analyses of the Linde–Hampson refrigeration system using multiple eco-friendly zeotropic refrigerants are conducted to compare the optimal COP, volumetric refrigerating capacity and irreversibility distribution at the cold space temperature of -45 °C to -25 °C. The genetic algorithm is employed on the global optimization of Linde–Hampson refrigeration system to find out the optimal operating pressures and proportions of mixed refrigerants. By comparison, the most potential binary and ternary refrigerants are selected as R744/R1234ze(Z) and R744/R1234ze(E)/R1234ze(Z), respectively. The temperature glide of ternary refrigerant is mainly regulated by the proportions of the middle-boiling-point and high-boiling-point components. The temperature glide of zeotropic refrigerants should well match the temperature span between heat reservoirs, since the matching degree plays an essential role in system performance, and it can be regarded as an important basis for the selection of mixed refrigerants. The results of comparison with the R744 two-stage compression transcritical refrigeration system and the cascade refrigeration system using R744 and R1234yf show that the Linde–Hampson system using suitable mixed refrigerants can obtain the greatest COP and can be considered as a supplement and alternative. The research results will provide a reference to the applications of the Linde–Hampson refrigeration system using eco-friendly zeotropic refrigerants for freezing process in considerations of environmental protection, safety, and efficiency.