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Modelling phase equilibria and viscosity for refrigerant-lubricant oil systems.
Author(s) : GARCÍA J., MONSALVO M. A., QUIÑONES-CISNEROS S. E., et al.
Summary
Thermophysical properties and phase behaviour of refrigerant-lubricant oil mixtures is highly important for optimal design of refrigeration systems. Refrigerant-lubricant mixtures may develop complex type of phase behaviour that must be taken into account in the design of cooling circuits and the lubricant selection. Such behaviour may include high-pressure liquid-liquid immiscibility regions and barotropic phenomena showing mass density inversions. In this paper, the phase and viscosity behaviour of mixtures containing environmentally friendly refrigerants (HFC-134a, HFC-125) and lubricant polyalkylene glycols (PAGs) or polyol esters are described. For that purpose, the Peng-Robinson (PR) equation of state has been used to model the phase behaviour of the studied refrigerant-lubricant mixtures. In addition, PR equation of state based friction theory models have also been used to model the viscosity behaviour of refrigerant-lubricant mixtures containing PAGs. All results of the calculations are compared against published experimental data.
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Details
- Original title: Modelling phase equilibria and viscosity for refrigerant-lubricant oil systems.
- Record ID : 2005-0056
- Languages: English
- Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
- Publication date: 2003/08/17
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Indexing
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Themes:
Compressors;
HFCs - Keywords: Viscosity; Thermal property; R134a; Polyolester; R125; Physical property; Modelling; Binary mixture; Oil; Refrigerant
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