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Flammability and reactivity of select HFCs and mixtures.

Author(s) : DEKLEVA T. W., LINDLEY A. A., POWELL P.

Type of article: Article

Summary

In comparing HFC with CFC refrigerants, it is realised that the introduction of hydrogen increases oxidative instability. This article describes research on R32, R125, R134a, also blends containing them. Tests indicate that at molten aluminium temperature, where R12 decomposes, R134a remains stable. Past tests for flammability have been conducted in small volumes where the high surface ratio and effect of ignition source may produce unreliable results. Tests conducted in 5-litre glass vessels or 8-litre autoclaves indicate that R134a remains non-flammable in air up to pressures of 690 kilopascals and temperatures of 170 deg C, above which a limited flammability range exists. R125 is similar. R32 has flammability characteristics comparable to ammonia. R32 blends with R134a or R125 can be rendered non-flammable. An equation evaluates the critical flammability parameter, i.e., the ratios of R134a and/or R125 required. The effect of leakage at variable rates is also shown.

Details

  • Original title: Flammability and reactivity of select HFCs and mixtures.
  • Record ID : 1994-3399
  • Languages: English
  • Source: ASHRAE Journal - vol. 35 - n. 12
  • Publication date: 1993/12
  • Document available for consultation in the library of the IIR headquarters only.

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