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Ignition of R-32 and R-410A refrigerant mixtures with lubricating oil.

Number: pap. 2672

Author(s) : BOUSSOUF A., LECOUSTRE V. R., LI H., et al.

Summary

This study examines the flammability risk of refrigerant and oil mixtures. The flammability risk associated with refrigerants is an important property to consider prior to their use in residential and commercial HVAC systems. This research was conducted to compare the ignition characteristics of R-32 with R-410A, and the effects of lubricating oil. Unpiloted hot-plate ignition tests and computational fluid dynamics (CFD) were used to determine the autoignition temperature and ignition probability data. The results indicate that the ignition temperature of R-32 impinging a hot plate is 764°C. This is 116°C higher than the reported autoignition temperature of R-32, but it is very close to the reported open top autoignition temperature. R-410A was found to ignite at a slightly higher temperature than R-32: 790°C. Tests with polyolester (POE) oil indicate that the R-32 ignition temperature is reduced to nearly that of the ignition of oil alone. CFD predictions for a jet of R-32 impacting a hot plate at a temperature close to autoignition temperature of R-32 show that ignition should happen only away from the jet point of impact and in rich regions.

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Pages: 9 p.

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Details

  • Original title: Ignition of R-32 and R-410A refrigerant mixtures with lubricating oil.
  • Record ID : 30013553
  • Languages: English
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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