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Convection-driven absorption of R-1234yf in lubricating oil.

Author(s) : MARCELINO NETO M. A., FRANÇA R. M., BARBOSA J. R. Jr

Type of article: Article, IJR article

Summary

Experiments were carried out to determine rates of absorption of R-1234yf through the free surface of an initially stagnant layer of lubricant POE ISO VG 10 in a closed system. Rayleigh instability at the phase interface gives rise to natural mass convection-driven absorption. Mass transfer rates computed via a cooling-law relationship involving a time-dependent mass transfer coefficient and a refrigerant mass fraction driving force (assuming phase equilibrium at the interface) yielded good agreement with data for the system pressure decay as a function of time. Due to the lack of data on phase equilibrium of the R-1234yf/POE ISO VG 10 mixture, a PVT cell was designed and constructed to measure the solubility of the oil-refrigerant system. Tests carried out with R-134a/POE ISO VG 10 under the same conditions showed that R-1234yf offers lower absorption rates in the oil, which may result in higher values for the equalizing pressure in refrigeration systems.

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Pages: 151-160

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Details

  • Original title: Convection-driven absorption of R-1234yf in lubricating oil.
  • Record ID : 30011733
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 44
  • Publication date: 2014/08

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