Elastohydrodynamic lubrication and lubricant rheology in refrigeration compressors
1998 (English)Doctoral thesis, comprehensive summary (Other academic)
The introductory chapter gives a general description of the lubrication of rolling element bearings in refrigeration compressors and rheological properties of oil-refrigerant mixtures. The influence of refrigerants on the viscosity, pressure-viscosity coefficient and film forming ability in a EHD-contact is described. A method is described for measuring the viscosity of oil-refrigerant mixtures measured using optical interferometry film thickness. The effect of pressured natural gas on the viscosity of polyalkyleneglycols was measured ar pressures up to 10 MPa. Viscosity and pressure-viscosity coefficient was measured on different polyolesters mixed with refrigerant R- 134a. Optical film thickness measurements was used to compare film forming ability of polyolesters with different structure. Lubrication limits and wear of rolling element bearings operating in a refrigerant atmosphere was studied. A new method of supplying lubricants to refrigeration compressor using controlled superheat of the lubricant mixture is suggested.
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 1998. , 37 p.
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544 ; 1998:17
Research subject Machine Elements
IdentifiersURN: urn:nbn:se:ltu:diva-18581Local ID: 946674e0-7b34-11db-8824-000ea68e967bOAI: oai:DiVA.org:ltu-18581DiVA: diva2:991590
Godkänd; 1998; 20061123 (haneit)2016-09-292016-09-29Bibliographically approved