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Insight into the flammability limit and combustion reactions behaviors of R1233zd(E)/R1270 mixtures refrigerants.

Author(s) : WANG X., TIAN H., SHU G., YANG Z.

Type of article: IJR article

Summary

The R1233zd(E)/R1270 mixture is a potential alternative refrigerant. However, its flammability must be considered. The effect of R1233zd(E) on the flammability limit and combustion mechanism of R1270 was investigated through both experiments and the ReaxFF MD method. Firstly, the flammability limit of the R1233zd(E)/R1270 mixture was determined at 298.15 K dry air using a high-precision experimental setup. The flammable zones of R1270 range from 2.51 % to 10.75 % at y = 0. As the R1233zd(E) ratio increases, the flammable zone of the refrigerant mixture initially increases and then decreases. When y = 0.9, there is a limit point where the lean and rich limits merge, and the volume fraction of R1270 is 1.32 %. Beyond this point, flame propagation becomes impossible. Then, this study analyzed the effect of R1233zd(E) on the combustion mechanism of R1270 at the atomic level using the ReaxFF MD method. The results showed that R1233zd(E) had an inhibitory effect on the consumption rate of R1270. The maximum reduction rates of R1270 consumption were 15.91 %, 5.73 %, 60.26 %, 14.81 %, and 23.17 % for five simulated temperatures. The F and Cl radicals compete with H, OH, and O radicals for binding sites on molecular fragments, thereby delaying the oxidation process. The reaction pathways and rate constants were also significantly inhibited. This study provides valuable guidance for the safe application of R1233zd(E)/R1270 mixture.

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Pages: 183-190

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Details

  • Original title: Insight into the flammability limit and combustion reactions behaviors of R1233zd(E)/R1270 mixtures refrigerants.
  • Record ID : 30033657
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 172
  • Publication date: 2025/04
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2025.01.023

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