Experimental study on operating characteristics of split air conditioning system during rapid leakage of refrigerant

doi:10.3785/j.issn.1008-973X.2023.10.017

Journal of ZheJiang University (Engineering Science)

2023, Vol. 57

Issue (10): 2086-2093 DOI: 10.3785/j.issn.1008-973X.2023.10.017

Experimental study on operating characteristics of split air conditioning system during rapid leakage of refrigerant

Shao-zhi ZHANG1,2(

),Jia-hao FANG1,2,Lu-yao LIANG1,2,Ze-tian LI1,2,Guang-ming CHEN1,2,*(

)

1. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Hangzhou 310027, China
2. Institute of Refrigeration and Cryogenic, Zhejiang University, Hangzhou 310027, China

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Abstract

A test rig that could monitor and control the refrigerant leakage from a household air-conditioner was built to study the interaction between leakage and running in the rapid refrigerant leakage process of refrigeration system. Experiments were carried out to investigate the system operation during the leakage process. The leak point was located indoor, the initial refrigerant charge was 920 g, and the initial leakage rate was from 0.08 to 0.60 g/s. The discharge temperature of compressor continuously rose, while the condensing pressure, the evaporating pressure, the inlet temperature of evaporator, the subcooling at outlet of condenser, and the compressor power consumption continuously decreased as the leakage process went on. The change of the above operating parameters would speed up when a critical ratio of refrigerant leakage was reached. The critical ratio was about 20% in refrigeration mode, and the critical ratio was about 15% in heating mode. The leakage rate gradually decreased as time elapsed. The leakage rates would be decreased by 55.7% and 63.6% respectively under refrigeration and heating modes.

Key words： refrigerant leakage refrigeration system operation performance air conditioner

Received: 07 November 2022 Published: 18 October 2023

CLC:

TK 01+8

Fund: 国家自然科学基金资助项目（51936007）

Corresponding Authors: Guang-ming CHEN E-mail: enezsz@zju.edu.cn;gmchen@zju.edu.cn

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Cite this article:

Shao-zhi ZHANG,Jia-hao FANG,Lu-yao LIANG,Ze-tian LI,Guang-ming CHEN. Experimental study on operating characteristics of split air conditioning system during rapid leakage of refrigerant. Journal of ZheJiang University (Engineering Science), 2023, 57(10): 2086-2093.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.10.017 OR https://www.zjujournals.com/eng/Y2023/V57/I10/2086

制冷剂快速泄漏过程中分体空调系统运行特性的实验研究

为了探究制冷系统的制冷剂在快速泄漏过程中，泄漏与运行之间的交互作用，搭建了能够监控制冷剂泄漏量的家用空调制冷系统泄漏实验台，并对泄漏过程中制冷系统的运行情况开展了实验. 在泄漏点位于室内机侧、初始制冷剂充注量为920 g、初始泄漏速率变化为0.08~0.60 g/s时，随着泄漏过程的进行，压缩机排气温度不断上升，蒸发器入口温度、冷凝压力、蒸发压力、冷凝器出口过冷度以及压缩机功率不断下降. 当制冷剂泄漏比例达到某一临界点时，上述运行参数会发生加速的情况. 在制冷模式下，临界比例约为20%，热泵模式下约为15%. 制冷剂的泄漏速度随时间逐渐减小，泄漏开始1 h后制冷和制热模式下的泄漏速度分别减小了55.7%和63.6%.

关键词： 制冷剂, 泄漏, 制冷系统, 运行性能, 空调

Fig.1 Flow chart of system leakage test bench

Fig.2 Actual picture of system leakage test bench indoor unit

Fig.3 Actual picture of system leakage test bench outdoor unit

Tab.1 Parameters of experiment measuring instruments

Fig.4 Schematic diagram of leakage unit

Fig.5 Accuracy verification of wet gas flow meter leakage measurement

Fig.6 Leakage speed varies with leakage process

Fig.7 Remaining charge in system varies with leakage process

Fig.8 Exhaust temperature varies with leakage process

Fig.9 Inlet temperature of evaporator varies with leakage process

Fig.10 Inlet pressure of evaporator varies with leakage process

Fig.11 Supercooling degree varies with remaining charge in system

Fig.12 Superheat degree varies with remaining charge in system

Fig.13 System power varies with leakage process


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