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Measurements of solubility, liquid density, and liquid viscosity for CO2-lubricant mixtures.
Author(s) : SEETON C. J., HRNJAK P. S.
Summary
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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Details
- Original title: Measurements of solubility, liquid density, and liquid viscosity for CO2-lubricant mixtures.
- Record ID : 2009-1888
- Languages: English
- Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
- Publication date: 2009/06/23
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Indexing
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Themes:
Thermodynamic measurements;
CO2;
Lubricants - Keywords: Viscosity; Solubility; Polyolester; Polyalkylene glycol; Measurement; Mixture; Oil; Critical density; Refrigerant; CO2
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