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On simple method for predicting burning velocities for lower flammability refrigerants using quenching distance measurement.

Author(s) : TAKIZAWA K., IGARASHI N., TOKUHASHI K., KONDO S.

Type of article: IJR article

Summary

For extensive use of low global warming potential refrigerants with low flammability, there is a need to develop a simple method to distinguish the lower flammability refrigerants from the higher flammability ones. The purpose of this paper is to investigate the applicability of the test method for flat-plate quenching distance (dq) for predicting the maximum burning velocity (Su0, max) of near 10 cm s−1. The dq measurement was carried out by the ASTM E582–07 method and the modified method for six binary blends that all have Su0, max of approximately 10 cm s−1. It was found that the standard 25-mm diameter glass plates placed in the vertical position give at most 11% smaller dq values than 50-mm diameter plates placed in the horizontal position, which was due to the upward motion by the buoyancy. Based on the thermal loss theory, a simple equation using the experimental dq was obtained to predict the Su0, max of the lower flammability blends.

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Pages: 370-377

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Details

  • Original title: On simple method for predicting burning velocities for lower flammability refrigerants using quenching distance measurement.
  • Record ID : 30027862
  • Languages: English
  • Subject: Technology, HFCs alternatives
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 120
  • Publication date: 2020/12
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.08.027
  • Document available for consultation in the library of the IIR headquarters only.

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