Relative permittivity of mixtures of R-134a and R-1234yf and a polyol ester lubricating oil

2015 ◽  
Vol 49 ◽  
pp. 141-150 ◽  
Author(s):  
Paulo C. Sedrez ◽  
Jader R. Barbosa
Keyword(s):  
Relative Permittivity ◽  
Lubricating Oil ◽  
Polyol Ester ◽  
R 134A

Compressibility of Oil/Refrigerant Lubricants in Elasto-Hydrodynamic Contacts

2005 ◽  
Vol 128 (1) ◽  
pp. 218-220 ◽  
Author(s):  
Roger Tuomas ◽  
Ove Isaksson
Keyword(s):  
High Pressure ◽  
Mineral Oil ◽  
Pressure Chamber ◽  
High Pressure Chamber ◽  
Polyol Ester ◽  
R 134A ◽  
Hfc Refrigerant

A high-pressure chamber is used to study lubricant compressibility when refrigeration oil is diluted by refrigerant. The tested lubricant in this work is a POE (polyol ester) oil, POE diluted with nonchlorinated (HFC) refrigerant R-134a, a naphthenic mineral oil, and the mineral oil diluted with the chlorinated (HCFC) refrigerant R-22. The high-pressure chamber experiments show that by adding 20 wt% of R-134a to the polyol ester oil, the stiffness of the lubricant increases by approximately 38 wt% at 1 GPa and is much higher than for R-22 and mineral oil.

Viscosity and Density of a Polyol Ester Lubricating Oil Saturated with Compressed Hydrofluoroolefin Refrigerants

2020 ◽  
Vol 65 (9) ◽  
pp. 4335-4346
Author(s):  
Ana Rita C. Morais ◽  
Luke D. Simoni ◽  
Mark B. Shiflett ◽  
Aaron M. Scurto
Keyword(s):  
Lubricating Oil ◽  
Polyol Ester

The Effect of the Diameter in Convective Boiling of Refrigerant R-134a

Equipment ◽  
2006 ◽  
Author(s):  
J. M. Saiz Jabardo ◽  
P. E. Lopes Barbieri
Keyword(s):  
Convective Boiling ◽  
R 134A

Flow boiling of R-134a in a minichannel plate evaporator with augmented surface

2002 ◽  
Author(s):  
A. P. Rupani ◽  
Majid Molki ◽  
Michael M. Ohadi ◽  
Francis Henrique Ramos Franca
Keyword(s):  
Flow Boiling ◽  
R 134A

Evaluation of the Rohsenow correlation through nucleate pool boiling data for refrigerants R-11, R-123, R-12, and R-134a

2002 ◽  
Author(s):  
J. M. Saiz Jabardo ◽  
Evandro Fockink da Silva ◽  
Gherhardt Ribatski ◽  
Samuel Freire de Barros
Keyword(s):  
Pool Boiling ◽  
Nucleate Pool Boiling ◽  
R 134A
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