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Oil presence in an evaporator: experimental validation of a refrigerant/oil mixture enthalpy calculation model.

Author(s) : YOUBI-IDRISSI M., BONJOUR J., TERRIER M. F., et al.

Type of article: Article, IJR article

Summary

In this study, the impact of the oil presence on the performance of a refrigerating machine was investigated both experimentally and numerically. To highlight the effect of oil, particularly on the evaporator behaviour, a theoretical model of enthalpy calculation for a refrigerant/oil mixture has been previously developed. In order to validate this model, tests were carried out on an industrial refrigerating machine working with R407C. The lubricant is a polyol-ester oil whose solubility curves are given by the oil manufacturer. The oil circulating mass fraction is measured by a sampling technique and by an on-line density measurement method, whose advantages and drawbacks are presented. Both the model and the experiments show that the ratio of enthalpy change through the evaporator with to without the oil presence increases when the apparent superheat at the evaporator outlet increases. This is due to the presence of a non-evaporated amount of liquid refrigerant dissolved in the oil at this location, which is confirmed by visual observations. The numerical and experimental results are found to be in good agreement as the maximum deviation is about 2.2%.

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Pages: 215-224

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Details

  • Original title: Oil presence in an evaporator: experimental validation of a refrigerant/oil mixture enthalpy calculation model.
  • Record ID : 2004-1103
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 3
  • Publication date: 2004/05

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