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Oil solubility effect on evaporation performance with R290 as refrigerant.

Author(s) : SUN Y., WANG X., WANG S.

Type of article: IJR article

Summary

The increasing awareness of the environmental impact of traditional refrigerants (such as R-404A, R-407C, R-134A, etc.) makes the demand for alternatives more urgent. Natural refrigerant propane (R-290) has a similar cooling capacity to R-22, that is attracting a great deal of attention in RAC. Toward better understanding of oil-presence effect on the evaporator performance working with R-290, the absorption behavior of R-290 in three kinds of oils (PAG 68, POE 75, PVE 68) were measured from 283.15 to 343.15 K using an isochoric saturation method. From the calculated results, the NRTL model could successfully represent the solubility of R-290/oil mixtures. Upon the experimental data, new pressure-enthalpy-vapor quality (p-h-X) diagrams were given for pure R-290 and R-290/oil blends. Isotherms of R-290/oil mixtures were divided into two regions, that is mainly related to solubility and oil circulation mass ratio. Oil-present impact on enthalpy changes in the evaporator, as well as the non-evaporation quality of R-290 at the evaporator outlet, were investigated. There is a positive correlation between enthalpy change rate and superheat, and an obviously negative correlation between enthalpy change rate and oil circulation mass fraction. Non-evaporation quality decreases with increasing superheat and increases with increasing oil circulation mass fraction.

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Pages: 200-207

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Details

  • Original title: Oil solubility effect on evaporation performance with R290 as refrigerant.
  • Record ID : 30031898
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 151
  • Publication date: 2023/07
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2023.04.007

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