Comparative thermodynamic study of CO2 transcritical supermarket booster refrigeration system combined with vapor injection and parallel compression

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-11-09 DOI:10.1016/j.ijrefrig.2024.11.007

Jiawei Jiang, Qichao Yang, Tailan Yin, Zeye Zheng, Yuanyang Zhao, Guangbin Liu, Liansheng Li

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Abstract

The use of CO₂ refrigerants in supermarket refrigeration has recently demonstrated great potential owing to their excellent thermophysical properties and environmental protection. To further improve the efficiency of transcritical CO₂ refrigeration systems, a parallel compression cycle with vapor injection system (SRC) is proposed. Thermodynamic model is established to investigate the influence of working condition parameters and compared with basic booster refrigeration system (BRC) and parallel compression refrigeration system (PRC). In addition, the effect of vapor injection parameters on the characteristics of the proposed system is investigated. The results show that the medium pressure has little effect on BRC, while the optimum value exists for both PRC and SRC. The performance of the three systems can be significantly enhanced by optimizing the discharge pressure and medium pressure. The optimal value of the relative vapor injection pressure is constant at about 1.15. The maximum coefficient of performance (COP_max) of the SRC is significantly improved by 23.99%∼32.14% and 14.44%∼20.07% at disccussed working conditions compared with BRC and PRC, respectively. In summary, this paper confirms the performance enhancement potential of the proposed cycle and provides theoretical support for its practical implementation.

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结合喷气和并联压缩的二氧化碳跨临界超市增压制冷系统的热力学比较研究

二氧化碳制冷剂具有优异的热物理性能和环保特性，因此最近在超市制冷领域的应用显示出巨大的潜力。为了进一步提高跨临界二氧化碳制冷系统的效率，提出了一种带喷气系统（SRC）的并联压缩循环。建立了热力学模型来研究工况参数的影响，并与基本增压制冷系统（BRC）和并联压缩制冷系统（PRC）进行了比较。此外，还研究了蒸汽注入参数对拟议系统特性的影响。结果表明，介质压力对 BRC 的影响很小，而对 PRC 和 SRC 都存在最佳值。通过优化排气压力和介质压力，可以显著提高三个系统的性能。相对蒸汽喷射压力的最佳值恒定在 1.15 左右。与 BRC 和 PRC 相比，在讨论的工况下，SRC 的最大性能系数（COPmax）分别显著提高了 23.99%∼32.14% 和 14.44%∼20.07% 。总之，本文证实了拟议循环的性能提升潜力，并为其实际应用提供了理论支持。

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来源期刊

International Journal of Refrigeration-revue Internationale Du Froid 工程技术-工程：机械

CiteScore

7.30

自引率

12.80%

发文量

363

审稿时长

3.7 months

期刊介绍： The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.