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The effects of lubricant on evaporator capacity for systems using mixtures of R12/mineral oil and R134a/synthetic oil.

Author(s) : GREBNER J. J., CRAWFORD R. R.

Summary

Baseline data were collected for mixtures of R12/naphthenic mineral oil and R12/paraffinic mineral oil at concentrations from 1 to 100% R12 (by mass) over the temperature range of -46 to 121 deg C. Data were also collected for mixtures of R134a/polyalkylene glycol (PAG) and R134a/ester-based oil at concentrations from 5 to 100% R134a over the same temperature range. These data were used predict the solubility behaviour of these refrigerant-oil mixtures. Idealized enthalpies for refrigerant-oil mixtures were calculated. These enthalpy equations, along with the empirical pressure-temperature-concentration models, were used to theoretically determine ideal evaporator capacities for each mixture at three lubricant concentrations: 1, 5, and 10%. Significant reductions in evaporator capacities were predicted due to the increase in saturation temperature resulting from the presence of oil greater for systems containing R12/mineral oil mixtures than for those containing R134a/synthetic oil mixtures.

Details

  • Original title: The effects of lubricant on evaporator capacity for systems using mixtures of R12/mineral oil and R134a/synthetic oil.
  • Record ID : 1994-0808
  • Languages: English
  • Source: ASHRAE Transactions 1993.
  • Publication date: 1993
  • Document available for consultation in the library of the IIR headquarters only.

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