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R32泄漏检测位置对室内安全性的影响
张文强, 郭官明, 郭小惠, 孟建军, 张恒
0
(青岛海信日立空调系统有限公司)
摘要:
针对壁挂式空调机通过实验和仿真的方法分析了R32制冷剂在不同泄漏位置、泄漏速率、空调运行状态下房间和室内机内R32的扩散规律及浓度分布。通过是否达到R32检测传感器报警浓度,传感器响应位置及可燃下限浓度区域等进行安全性评价。结果表明:室内机内传感器报警时间约为40 s,响应速度相比房间内传感器快约50%;实验和仿真结果具有较高一致性;泄漏位置对R32扩散规律的影响较大、泄漏速率的影响较小,空调送风状态下的R32泄漏报警浓度区域远小于停机状态,且停机泄漏的室内机内R32浓度是送风泄漏的4倍以上;R32传感器在室内机内的最佳放置位置为电气盒和前换热器之间偏下方区域;换热器翅片处R32泄漏时,传感器无响应,制冷剂持续进入房间内,存在安全隐患;LFL区域最大约为3×10-6 m3,安全风险较低。
关键词:  制冷剂泄漏  安全性评价  扩散规律  浓度分布  可燃区域
DOI:
投稿时间:2023-04-07  修订日期:2023-06-09   录用日期:2023-07-31
基金项目:青岛西海岸新区自主创新重大专项基金项目(2020-11)资助。
Influence of R32 Leak Detection Position on Indoor Safety
Zhang Wenqiang, Guo Guanming, Guo Xiaohui, Meng Jianjun, Zhang Heng
(Qingdao Hisense Hitachi Air-conditioning System Co., Ltd.)
Abstract:
In this study, the leakage diffusion and concentration distribution characteristics of R32 refrigerants from a wall-mounted split air-conditioner indoor unit are analyzed by combining experiments and simulations under different leak locations, refrigerant leak rates, and operating conditions. Safety is compared and evaluated based on whether the R32 mass fraction reaches the R32 refrigerant detector alarm concentration (4% LFL), the positions of the responsive detectors, and the lower flammability limit (LFL) area. The results show that the response time of the detectors inside the indoor unit is approximately 40 s and 50% faster than that located in the room. The experimental and numerical results show a high consistency. The diffusion law of R32 is different at different leak locations. The leak rate of R32 slightly influences the concentration distribution in the indoor unit. The area where the 4% LFL is reached when the air conditioning is ventilated is four times smaller than when the air conditioning is turned off. The best position to install the R32 refrigerant detector is the lower area between the electrical box and the front heat exchanger. When R32 leaks at the fin of the heat exchanger, the R32 refrigerant detector fails to respond, and the refrigerant continues to leak into the room, posing a safety hazard. The LFL volume is approximately 3×10-6 m3. The LFL region is a small area around the R32 leak port, and its safety risk is low.
Key words:  refrigerant leakage  safety evaluation  diffusion law  concentration distribution  flammable area

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