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Concentration measurement of refrigerant/refrigeration oil mixture by refractive index.

Author(s) : FUKUTA M., YANAGISAWA T., MIYAMURA S., et al.

Type of article: Article, IJR article

Summary

Refrigeration oil having good miscibility with refrigerant is generally used in refrigeration units. Precise measurement of the mixing ratio of refrigerant to refrigeration oil is required for a sufficient understanding of the refrigeration cycle. In this article, the refractive index is chosen as a property which indicates the mixing concentration of the refrigerant/oil mixture. A laser displacement sensor was used to detect a modification in the optical path which changes according to the refractive index of the test medium. The refractive indices of pure refrigerant, pure refrigeration oil and refrigerant/refrigeration oil mixture are measured with several combination of refrigerant/oil. It was found that the differences in the refractive indices of the refrigerant and the oil are sufficient for the measurement of the mixing concentration of refrigerant/oil mixture, and that the refractive index of the refrigerant/oil mixture changes almost linearly according to the mixing concentration. These data will be utilized for development of an in situ sensor in refrigerant compressors.

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Format PDF

Pages: 346-352

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Details

  • Original title: Concentration measurement of refrigerant/refrigeration oil mixture by refractive index.
  • Record ID : 2004-1573
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 4
  • Publication date: 2004/06

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