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Experimental study on R32 leakage and diffusion characteristic of wall-mounted air conditioners under different operating conditions

Author

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  • Jia, Lizhi
  • Jin, Wufeng
  • Zhang, Yan

Abstract

With good thermal performance and environmental characteristics, R32 is an alternative refrigerant of R22, but its application is limited by its flammability. In view of indoor security, this paper analyzed the leakage and diffusion of R32 of wall-mounted air conditioners under different operating conditions. The impact of air supply velocities and the leakage hole positions on the concentration distribution was also analyzed when the refrigerant leaks from the indoor unit while the air conditioner is operating. The results show that the leakage rate of R32 decreases with air conditioner operation time. The leakage process of refrigerant under the operating conditions can be classified into a fast leak stage and a slow leak stage. When the refrigerant leaks from the inlet pipe of the evaporator, the leakage rate is higher than that from the outlet pipe of the evaporator. This paper also analyzed the impact of air supply velocities on the concentration distribution and obtained the concentration distribution under different operating conditions. The concentration distribution was compared when the R32 leaks from different positions. Then, the indoor security was evaluated when R32 leaks from an operating air conditioner. And the results suggest that the combustible zone only appears near the leakage hole and the duration of the combustible zone is very short. We can infer that the fire risk of R32 as the alternative refrigerant of an air conditioner is very low under the general operation conditions.

Suggested Citation

  • Jia, Lizhi & Jin, Wufeng & Zhang, Yan, 2017. "Experimental study on R32 leakage and diffusion characteristic of wall-mounted air conditioners under different operating conditions," Applied Energy, Elsevier, vol. 185(P2), pages 2127-2133.
    • Handle: RePEc:eee:appene:v:185:y:2017:i:p2:p:2127-2133
    DOI: 10.1016/j.apenergy.2016.01.041
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    References listed on IDEAS

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    1. Cheong, K. W. & Riffat, S. B., 1996. "Monitoring hydrofluorocarbon refrigerant leakage from air-conditioning systems in buildings," Applied Energy, Elsevier, vol. 53(4), pages 341-347, April.
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    Cited by:

    1. Qv, Dehu & Dong, Bingbing & Cao, Lin & Ni, Long & Wang, Jijin & Shang, Runxin & Yao, Yang, 2017. "An experimental and theoretical study on an injection-assisted air-conditioner using R32 in the refrigeration cycle," Applied Energy, Elsevier, vol. 185(P1), pages 791-804.

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    More about this item

    Keywords

    R32; Leakage; Diffusion; Leakage hole position; Supply air velocity; Safety;
    All these keywords.

    JEL classification:

    • R32 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - Real Estate Markets, Spatial Production Analysis, and Firm Location - - - Other Spatial Production and Pricing Analysis

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