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Validation experiments on HFO-1123 mixtures: disproportionation reaction and its suppression by internal structure in refrigerant compressor.

Number: 2493

Author(s) : ZHANG Z., OKAMOTO H., ITO M., HIHARA E.

Summary

Trifluoroethylene (HFO-1123) emerges as a promising next-generation refrigerant for refrigeration and air-conditioning applications, attributed to its extremely low global warming potential (GWP) of less than one and zero ozone depletion potential (ODP). Nevertheless, it is known to cause a thermal decomposition, called disproportionation reaction, under extreme conditions of high temperature and pressure. Previous research investigated the marginal pressure for the propagation of the HFO-1123 disproportionation reaction. The addition of inhibitors proved an effective method for suppressing this reaction. This inhibition effect was confirmed through extensive laboratory experiments and further substantiated by validation experiments using an actual compressor. Results demonstrate that disproportionation reaction can be effectively suppressed even under the anticipated worst operational condition. However, comprehensive consideration of flammability, refrigerant performance, and GWP is essential for commercial application. Consequently, this study extends its scope to include validation experiments on new refrigerant mixtures, considering these additional factors. Results identify several combinations that effectively suppress the reaction. Moreover, a previous study demonstrated that propagation of the disproportionation reaction could be suppressed when passing through a narrow slit, which is attributed to heat conductivity at the surface of the narrow slit. This phenomenon resembles the quenching distance observed in the flame propagation through the parallel boards. Therefore, the internal design of refrigerant compressors is crucial to suppressing the propagation. This hypothesis is verified through the validation experiments. Findings from this study provide valuable insights into the practical implementation of substances with disproportionation reaction issues like HFO-1123 as a next-generation refrigerant. Furthermore, results also reveal that the input energy significantly influences the disproportionation propagation.

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  • Original title: Validation experiments on HFO-1123 mixtures: disproportionation reaction and its suppression by internal structure in refrigerant compressor.
  • Record ID : 30033048
  • Languages: English
  • Subject: Technology
  • Source: 2024 Purdue Conferences. 20th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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