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Control of refrigerant vapour release from polyol ester/halocarbon working fluids.

Author(s) : SWALLOW A., SMITH A., GREIG B.

Summary

New synthetic polyol ester compressor lubricants have been developed primarily for use with hydrofluorocarbon refrigerants. A major application area for polyol ester lubrication over this period has been as retrofill lubricants for conversion of existing CFC or HCFC systems to HFC refrigerants. A consequence of the high purity of polyol ester lubricants is that the outgassing rate of dissolved refrigerant is significantly higher than that for mineral oils. The increased rate of outgassing can result in lubrication failure of the compressor. Problems caused by outgassing of refrigerant can be overcome by redesign of the compressor for new systems using ester oil. However, compressor design changes are often not a viable option for existing compressors that still have a long potential life and will be eligible for retrofill conversion. The paper details some of the potential retrofill problem areas and demonstrates an inexpensive solution by a simple change in synthetic ester lubricant properties.

Details

  • Original title: Control of refrigerant vapour release from polyol ester/halocarbon working fluids.
  • Record ID : 1997-0767
  • Languages: English
  • Source: ASHRAE Transactions.
  • Publication date: 1995/06/24
  • Document available for consultation in the library of the IIR headquarters only.

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