Numerical investigation of discharge pressure effect on steam ejector performance in renewable refrigeration cycle by considering wet steam model and dry gas model

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-04 DOI:10.1515/cppm-2023-0092

Yongman Lin, Zaijin Xie, Weihua Guan, Lili Gan

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引用次数: 0

Abstract

Abstract In recent times, steam ejectors have garnered significant interest among researchers due to their environmental friendliness and the utilization of low-grade energy sources. However, a key drawback of the ejector refrigeration cycle (ERC) is its relatively low coefficient of performance (COP). Understanding the behavior of ejectors under various operating conditions is crucial for addressing this concern. This study specifically focuses on investigating the flow characteristics of ejectors in the single-choking mode. Both dry steam model (DSM) and wet steam model (WSM) are employed to analyze and evaluate the performance in this study. Based on the findings, it is evident that the discharge pressure (DP) significantly influences the flow characteristics. With increasing DP, there is a decrease in the Mach number and liquid mass fraction (LMF) within the ejector, while the temperature distribution shows an upward trend. Additionally, as the DP increases, there is a notable decline in the entrainment ratio (ER) and production entropy. With an increase in the DP, both the DSM and WSM exhibit similar trends. However, in the DSM, the ER reaches zero at an earlier stage compared to the WSM. Specifically, when the DP rises from 5000 Pa to 5600 Pa, there is a 12.6 % increase in the production entropy in the WSM, while the DSM experiences a slightly higher increase of 12.9 %.

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通过考虑湿蒸汽模型和干气模型，对排放压力对可再生制冷循环中蒸汽喷射器性能的影响进行数值研究

摘要近来，蒸汽喷射器因其环保性和可利用低品位能源而备受研究人员的关注。然而，喷射器制冷循环（ERC）的一个主要缺点是性能系数（COP）相对较低。要解决这一问题，了解喷射器在各种运行条件下的行为至关重要。本研究特别侧重于研究单焦化模式下喷射器的流动特性。本研究采用干蒸汽模型（DSM）和湿蒸汽模型（WSM）来分析和评估其性能。研究结果表明，排放压力（DP）对流动特性有显著影响。随着 DP 的增大，喷射器内的马赫数和液体质量分数 (LMF) 会下降，而温度分布则呈上升趋势。此外，随着 DP 的增加，夹带率 (ER) 和生产熵也明显下降。随着 DP 的增加，DSM 和 WSM 都呈现出类似的趋势。然而，与 WSM 相比，在 DSM 中，ER 在更早的阶段归零。具体来说，当 DP 从 5000 Pa 升至 5600 Pa 时，WSM 的生产熵增加了 12.6%，而 DSM 的增幅略高，为 12.9%。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.