Effect of Heat Exchanger and Capillary Geometry on the performance of Joule- Thomson Refrigerators operating with different mixtures

IF 17.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-06-12 DOI:10.1115/1.4065721

Venkatesh Dasari, G. Venkatarathnam

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引用次数: 0

Abstract

Joule-Thomson (J-T) refrigerators or J-T cryocoolers are extensively used in many low-temperature applications. J-T refrigerators operating with nitrogen-hydrocarbon (N2-HC) refrigerant mixtures offer several advantages, such as low operating pressures (<20 bar), high exergy efficiency, no moving parts in the cold section, and low cost. The cooling power or cooling capacity of the J-T refrigerator depends on the hardware used as well as the refrigerant composition. The proposed work focuses on estimating the cooling capacity of a mixed refrigerant J-T (MRJ-T) refrigerator of the given hardware and specified refrigerant. An iterative steady-state full-cycle simulation procedure has been presented in this work to simulate the complete system and estimate the cooling capacity, taking into account the possibility of choking of the expansion capillary. Some of the results have been validated against experimental results of an MRJT refrigerator available in the open literature. The details of the simulation model and the results of our studies on the prediction of stable operating range, maximum cooling capacity, the effect of heat exchanger geometry, expansion capillary geometry, mixture composition, and choking of the refrigerant mixture on the performance of an MRJ-T refrigerator are presented in this paper

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热交换器和毛细管几何形状对使用不同混合物的焦耳-汤姆逊冰箱性能的影响

焦耳-汤姆森（J-T）制冷机或 J-T 低温冷却器广泛应用于许多低温领域。使用氮-碳氢化合物（N2-HC）混合制冷剂的 J-T 制冷机具有多种优势，如工作压力低（<20 巴）、放能效率高、冷冻部分无活动部件以及成本低。J-T 冰箱的制冷功率或制冷能力取决于所使用的硬件和制冷剂成分。拟议工作的重点是估算给定硬件和指定制冷剂的混合制冷剂 J-T （MRJ-T）冰箱的制冷量。这项工作提出了一种迭代稳态全周期模拟程序，用于模拟整个系统并估算制冷量，同时考虑到膨胀毛细管窒息的可能性。其中一些结果与公开文献中 MRJT 制冷机的实验结果进行了验证。本文介绍了模拟模型的详细内容，以及我们在预测稳定工作范围、最大制冷量、热交换器几何形状、膨胀毛细管几何形状、混合物成分和制冷剂混合物窒息对 MRJ-T 制冷机性能的影响等方面的研究结果。

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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.