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Flammability indices for refrigerants: evaluation of conventional indices and a new proposal.

[In Japanese. / En japonais.]

Author(s) : KATAOKA O.

Type of article: Article

Summary

This paper introduces a new index to classify flammable refrigerants. A question on flammability indices that ASHRAE employs arose from combustion test results of R152a and ammonia. Conventional methods used not only by ASHRAE but also by ISO, in compliance with Japanese High-pressure gas safety legal requirements, to classify the flammability of refrigerants are evaluated to show why these methods conflict with the test results. The key finding of this paper is that the ratio of stoichiometric concentration to LFL concentration (R factor) represents the test results most precisely. In addition, it has excellent correlation with other flammability parameters such as flame speed and pressure rise coefficient. Classification according to this index gives reasonable flammability order of substances including ammonia, R152a and carbon monoxide. Theoretical background explaining why this index gives good correlation is also discussed as well as this method's limitations.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2002-2812
  • Languages: Japanese
  • Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 18 - n. 3
  • Publication date: 2001
  • Document available for consultation in the library of the IIR headquarters only.

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