CIESC Journal ›› 2023, Vol. 74 ›› Issue (2): 953-967.DOI: 10.11949/0438-1157.20221046

• Process safety • Previous Articles     Next Articles

Influence of physical properties of working fluids on leakage and diffusion characteristics of refrigerant in limited space

Peixu ZHOU1(), Yalun LI1, Gongran YE1, Yuan ZHUANG1, Xilei WU1, Zhikai GUO2, Xiaohong HAN1()   

  1. 1.Institute of Refrigeration and Cryogenics, Zhejiang University, Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province,Hangzhou 310027, Zhejiang, China
    2.State Key Laboratory for Fluorinated Greenhouse Gases Replacement and Control Treatment, Zhejiang Research Institute of Chemical Industry Co. , Ltd. , Hangzhou 310023, Zhejiang, China
  • Received:2022-07-06 Revised:2023-01-26 Online:2023-03-21 Published:2023-02-05
  • Contact: Xiaohong HAN

有限空间内工质物性对制冷剂泄漏扩散特性的影响

周培旭1(), 李亚伦1, 叶恭然1, 庄园1, 吴曦蕾1, 郭智恺2, 韩晓红1()   

  1. 1.浙江大学制冷与低温研究所,浙江省制冷与低温技术重点实验室,浙江 杭州 310027
    2.含氟温室气体替代及控制处理 国家重点实验室,浙江省化工研究院有限公司,浙江 杭州 310023
  • 通讯作者: 韩晓红
  • 作者简介:周培旭(1998—),男,硕士研究生,22027101@zju.edu.cn
  • 基金资助:
    国家自然科学基金项目(51936007)

Abstract:

A new generation of environmentally friendly working fluids such as R290 and R32 will cause certain safety hazards if they leak due to their explosive characteristics, while the leakage of widely used working fluids such as R22 will also aggravate the greenhouse effect, thereby lead to deterioration of the global climate. Thus, it is necessary to study the leakage, diffusion and deposition of working fluid. In this paper, the numerical simulation of the leakage and diffusion process of working fluids with different physical properties is carried out. In the simulation, the Species component transport model is used to study the concentration of the working fluids under the leakage hole in the limited space, and the influence of the physical properties such as density and viscosity on the leakage and diffusion process. The results show that in the space under the leakage hole, density has a great influence on the concentration distribution of the working fluids, followed by viscosity. The higher the density, the greater the mass fraction of working fluid in the space under the leakage hole. The higher the viscosity, the worse the fluidity of the working fluid, and the greater the mass fraction in the space under the leakage hole. In the whole space, the greater the density of the working fluid, the easier it is to diffuse to the middle and lower part of the room and form a higher mass fraction. The greater the viscosity of the working fluid, the easier it is to entrain with the surrounding air.

Key words: physical properties of working fluids, refrigerant, leakage, limited space, diffusion

摘要:

新一代环境友好型工质如R290、R32等由于其燃爆特性,一旦发生泄漏会造成一定的安全隐患,而仍使用较为广泛的工质如R22等一旦发生泄漏同样会加剧温室效应,从而造成全球气候环境恶化。开展工质的泄漏扩散沉积等相关特性的研究十分必要。针对工质在泄漏扩散过程中由于物性的差异造成的泄漏扩散开展了数值模拟研究,模拟中采用Species组分输运模型,考虑密度、黏度等工质物性参数的差异,对工质在泄漏孔下方、泄漏有限空间内的浓度变化,以及密度、黏度等物性对泄漏扩散过程的影响进行了研究。结果表明:泄漏孔下方区域,密度对工质的浓度分布影响较大,其次是黏度;密度越大,工质在泄漏孔下方区域质量分数越大;黏度越大,工质流动性越差,在泄漏孔下方区域质量分数越大。整个有限空间内,工质的密度越大,越易于向空间的中下部区域扩散并形成较高的质量分数;工质的黏度越大,越易于与周围空气发生卷吸作用。

关键词: 工质物性, 制冷剂, 泄漏, 有限空间, 扩散

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