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Elastohydrodynamic lubrication properties of polyol ester lubricants-R134a mixtures.

Author(s) : JONSSON U. J., LILJE K. C.

Summary

A modern screw compressor contains several highly loaded metal-to-metal contacts lubricated with oil, including rolling element bearings, gears, and the rotors. These types of contacts are normally referred as Elasto-Hydro-Dynamic (EHD) or Elasto-Hydro-Lubrication contacts, due to the elastic deformation of the surfaces. The expected life of such bearings is to a large degree related to the lubricant film thickness in the bearings. The properties of the lubricant that determine the film thickness in an EHD-contact are normally the dynamic viscosity, eta, and the pressure-viscosity coefficient, alpha. In a refrigeration system, both those parameters are affected by the presence of refrigerant. An empirical model has been developed that can be used to predict the pressure-viscosity coefficient based on viscosity and amount of branched acids in the lubricant.

Details

  • Original title: Elastohydrodynamic lubrication properties of polyol ester lubricants-R134a mixtures.
  • Record ID : 1999-3517
  • Languages: English
  • Source: Proceedings of the 1998 International Compressor Engineering Conference at Purdue (ICECP 1998).
  • Publication date: 1998/07/14
  • Document available for consultation in the library of the IIR headquarters only.

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