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Transient oil-refrigerant mixture migration and change of properties at compressor shutdown.

Number: 2265

Author(s) : WANG X., HAIDER S. A., HRNJAK P., ELBEL S.

Summary

The oil migration has great impact on the vapor compression systems, especially for systems that require frequent on-off cycling. Excessive amount of oil retained in the system and lack of oil return to the compressor can cause low system efficiency and potential compressor failure. This paper aims at exploring oil-refrigerant mixture properties during startup and shutdown period at different locations in the system. The variation of temperature and pressure would result in different mixture concentrations and properties. Oil properties like solubility, viscosity, density, surface tension and contact angle can be influenced and will affect system performance.
During the compressor shutdown, the oil flow in contact with the inner wall of discharge stops immediately with while oil droplets in the vapor core flow slower and stop gradually. In the end, oil droplets flow down and coalesce with oil film to accumulate at the bottom of the tube. The high-speed camera and video analysis method are used to analyze oil migration and show variation of surface tension, viscosity, and wettability. Properties of mixture like solubility, density, saturation pressure and viscosity are predicted using existing models.

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  • Original title: Transient oil-refrigerant mixture migration and change of properties at compressor shutdown.
  • Record ID : 30030634
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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