Document IIF

Mesures de solubilité, masse volumique et viscosité du liquide pour des mélanges de frigorigènes au CO2/huile.

Measurements of solubility, liquid density, and liquid viscosity for CO2-lubricant mixtures.


Experimental data on solubility, liquid density, liquid viscosity, and miscibility measured with carbon dioxide (CO2) and three types of potential lubricants, a polyalkylene glycol (PAG), a polyolester (POE), and a polyvinyl ether (PVE), are presented. Measurements were also made and are presented with a baseline PAG lubricant with 1,1,1,2-tetrafluoroethane (HFC-134a). An experimental facility for measuring the thermophysical properties of the refrigerant-lubricant mixtures has been developed to carry out experiments from -30 to 125°C with pressures from vacuum to 15.0 MPa. The apparatus operates on a recirculation method utilizing a vibrating-tube densimeter for mixture density measurements, an oscillating piston viscometer for mixture viscosity measurements, platinum RTDs for temperature measurements and a precision strain-gauge pressure transducer for solubility measurements. Measurements have k= 2 uncertainty levels of ±0.15 K in temperature, ±20 or ±3.5 kPa in pressure, liquid density uncertainty of ±0.002 g/cm3, liquid viscosity uncertainties down to ±0.1 cP, and liquid refrigerant composition uncertainty below ±0.002 g/g. The data are presented both in tabular formant and in the form of "Daniel Charts", a viscosity-temperature chart that contains an overlay of the solubility of the refrigerant-lubricant mixture. Since CO2 is only partially soluble in the chosen lubricants, the miscibility phase separation boundary was also measured.

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Pages : 2009-5


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  • Titre original : Measurements of solubility, liquid density, and liquid viscosity for CO2-lubricant mixtures.
  • Identifiant de la fiche : 2009-1888
  • Langues : Anglais
  • Source : 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Date d'édition : 23/06/2009


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