Visualization study of two-phase flow and noise control in a multiple temperature refrigerator during the defrost cycle

IF 0.3 4区工程技术 Q4 ACOUSTICS

Noise Control Engineering Journal Pub Date : 2022-03-01 DOI:10.3397/1/377014

Liang Pu, Shengqi Zhang, Yiguang Pan, Jinglong Sun, Qiang Li

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引用次数: 0

Abstract

To reduce the noise caused by the flow of refrigerant during the defrost cycle and preserve the ambient sound level, this study concentrated on exploring the mechanism of noise generation in the gas–liquid separator based on visualization experiments. A transparent gas–liquid separator made of quartz glass, which was instead of the original one, was fabricated to observe the flow pattern of refrigerant in the gas–liquid separator, and the relationship between flow pattern and noise generation was investigated. The results showed that the noise is mainly generated during the defrost cycle. The sound power level has a drastic fluctuation when the liquid level of refrigerant in the gas–liquid separator is higher than the outlet of the evaporation tube during the defrost cycle. The reduction in noise is achieved by the redesigns that prevent the liquid level of refrigerant in the gas–liquid separator being higher than the outlet of the evaporation tube during the defrost cycle. Then, the noise level of original design and two redesigns was measured in a high precision semi-anechoicroom, respectively. The noise level of the refrigerator reduces from 30.2 dB(A) to 26.1 dB(A) and 24.4 dB(A) by increasing the volume of the gas–liquid separator for 87.1% and installing a ball valve respectively.

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多温制冷机除霜循环过程中两相流动及噪声控制的可视化研究

为了减少除霜循环中制冷剂流动引起的噪声，保持环境噪声水平，本研究基于可视化实验，重点探讨了气液分离器噪声产生的机理。制作了一个由石英玻璃制成的透明气液分离器，以观察制冷剂在气液分离器中的流动模式，并研究了流动模式与噪声产生的关系。结果表明，噪声主要产生在除霜循环过程中。在除霜循环中，当气液分离器中制冷剂的液位高于蒸发管的出口时，声功率水平会发生剧烈波动。通过重新设计可以防止除霜循环期间气液分离器中制冷剂的液位高于蒸发管的出口，从而降低噪音。然后，在高精度半消声室中分别测量了原设计和两次重新设计的噪声水平。通过将气液分离器的体积增加87.1%和安装球阀，冰箱的噪声水平分别从30.2 dB（A）降低到26.1 dB（A。

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

Noise Control Engineering Journal 工程技术-工程：综合

CiteScore

0.90

自引率

25.00%

发文量

审稿时长

3 months

期刊介绍： NCEJ is the pre-eminent academic journal of noise control. It is the International Journal of the Institute of Noise Control Engineering of the USA. It is also produced with the participation and assistance of the Korean Society of Noise and Vibration Engineering (KSNVE). NCEJ reaches noise control professionals around the world, covering over 50 national noise control societies and institutes. INCE encourages you to submit your next paper to NCEJ. Choosing NCEJ: Provides the opportunity to reach a global audience of NCE professionals, academics, and students; Enhances the prestige of your work; Validates your work by formal peer review.