Advanced model for a non-adiabatic capillary tube considering both subcooled liquid and non-equilibrium two-phase states of R-600a

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2024-10-28 DOI:10.1016/j.ijrefrig.2024.10.031

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引用次数: 0

Abstract

Previous empirical correlations have largely failed to predict the mass flow rate variations of R-600a during the transient pull-down operation of household refrigerators. This shortcoming is attributed to the fact that these correlations were developed for specific thermodynamic states of the refrigerant at the capillary inlet, whereas the thermodynamic state varies during transient operations, particularly involving non-equilibrium two-phase states. To address these limitations, a novel model has been developed. This model comprises two distinct sub-models corresponding to the refrigerant state at the capillary tube inlet: one for the subcooled liquid state and the other for the non-equilibrium two-phase state. These sub-models are integrated to account for the transitions in the thermodynamic state of R-600a at the capillary inlet. The integrated model demonstrates excellent agreement with observed variations in the R-600a mass flow rate during the pull-down operation of actual refrigerators. The mean absolute percentage error between the measured and estimated mass flow rates is approximately 10 % over the entire period of pull-down operations tested under various environmental conditions.

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考虑到 R-600a 过冷液体和非平衡两相状态的非绝热毛细管高级模型

以前的经验相关性在很大程度上无法预测 R-600a 在家用冰箱瞬态下拉运行过程中的质量流量变化。造成这一缺陷的原因是，这些相关性是针对毛细管入口处制冷剂的特定热力学状态开发的，而在瞬态运行期间，热力学状态会发生变化，特别是涉及非平衡两相状态时。为了解决这些局限性，我们开发了一种新型模型。该模型由两个不同的子模型组成，分别对应毛细管入口处的制冷剂状态：一个是过冷液态，另一个是非平衡两相状态。对这些子模型进行了整合，以说明 R-600a 在毛细管入口处的热力学状态的转变。综合模型与实际冰箱在下拉运行过程中观察到的 R-600a 质量流量变化非常吻合。在各种环境条件下测试的整个下拉操作期间，测量质量流量和估计质量流量之间的平均绝对百分比误差约为 10%。

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

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.